Sunday, January 31, 2010

Philadelphus - Mock Orange

A genus of mostly deciduous shrubs native to temperate regions of North America, Europe and Asia.
Plants typically have an extensive root system. Rarely eaten by deer. Most prefer full sun to partial shade on just about any well drained soil. Tolerant of clay and alkaline soil.
Prune back immedately after flowering during spring to encourage dense habit. Old overgrown plants can be cut back to near ground level during early spring and will regrow vigorously however not blooming for a year or 2. Protect young plants from rabbits which will eat the stems, often to the ground. Netting can easily accomplish this.
Propagation is from seed sown during autumn or softwood cuttings taken during summer. Hardwood cuttings can also be taken during late fall or winter.

* photo of unknown source on internet

* photo taken on Aug 7 2012 in London, Ontario
* historical archive photo

* photos taken on July 25 2015 @ Niagara-on-the-Lake, Ontario

* photos taken on May 27 2017 @ Meadowlark Botanical Gardens, Vienna, VA


Philadelphus argyrocalyx ( Silvercup Mock Orange )
A rare, vigorous, erect, twiggy, deciduous shrub, reaching a maximum height of 8 feet, that is native to mountains of south-central New Mexico. It is closely related to Philadelphus microphyllus.
The elliptic leaves, up to 2 x 1 inches, are smooth deep green above, bristly pale green beneath.
The very fragrant, solitary, white flowers, up to 2 inches across, are borne during early summer.
The twigs are rusty, hairy at first, turning to gray-brown.
Hardy zones 5 to 9.

Philadelphus brachybotrys 'Laxiflorus'
An upright, large shrub, that is native to eastern China. It is closely related to P. pekinensis. Some records include: fastest recorded growth rate - 3.5 feet; largest on record - 14 x 16 feet.
The ovate leaves, up to 5 x 3 inches, are mid-green.
The fragrant, white flowers are borne during early summer.
Hardy zones 4 to 8, it thrives in the massive Mock Orange collection at Dominion Arboretum In Ottawa, Canada.

Philadelphus calvescens ( Delavay Moch Orange )
A large, deciduous shrub, reaching a maximum height of 17 ( rarely over 8 ) feet, that is native to Tibet, southwest China and Burma.
The ovate leaves, up to 6 x 3 inches in size, are deep green.
The showy, fragrant, pure white flowers are borne in clusters of 5 to 9 during early summer.
Hardy zones 6 to 8 ( possibly 5b on protected sites )

Philadelphus caucasicus ( Caucasian Mock Orange )
Considered by some to be the same as P. coronarius. It is native to the Russian Caucasus and reaches up to 10 feet in height.
The leaves are nearly identical to that of P. coronarius but are downy beneath.
The fragrant flowers are white.
Hardy zones 3 to 8, it thrives at Dominion Arboretum in Ottawa, Canada but is generally unknown in North America.

Philadelphus coronarius ( Sweet Mock Orange )
A fast growing, upright, large, deciduous shrub, that is native from southern Europe into western Asia. Some records include: fastest recorded growth rate - 3.3 feet; 10 years - 17 x 13 feet; largest on record - 17 x 13 feet with a trunk diameter of 1.9 feet ( at base ).
The shallow-toothed, oval leaves, up to 5 x 2 inches, are deep green above, paler beneath.
The very fragrant, white flowers, up to 2 inches across, are borne on short terminal racemes during early summer
The bark is attractive and peeling.
Hardy zones 3 to 9, it thrives in Ontario at least as far north as the Ottawa Valley. Drought tolerant. Overgrown plants can be cut back hard during winter and will resprout vigorously.


* photos taken on May 26 2013 in Columbia, MD

* photos taken on Sep 5 2013 in Elkridge, MD

* photos taken on Oct 22 2013 in Towson, MD

* photo taken on Apr 8 2015 in Towson, MD

* photos taken on July 25 2015 @ Niagara-on-the-Lake, Ontario

* historic archive photos


'Aureus'
Compact in habit, reaching up to 8 x 5 feet in 5 years or eventually 12 x 12 ( rarely over 8 x 8 ) feet, with golden-yellow foliage later turning to bright green.
The fragrant flowers are white.
Prefers light shade, too much sun can scorch the foliage and too much shade can turn to foliage to just plain green.

* photos taken @ Brookside Gardens "Party With the Peonies" tour in Fulton, MD on May 21 2011




'Bowles Variety'
Foliage is variegated with a white margin.

'Variegata'
The mid-green foliage is variegated with a broad white margin; it is otherwise identical to the species.
Prefers partial shade.

Philadelphus delavayi ( Delavay Mock Orange )
A striking, vigorous, upright deciduous shrub, that is native from western China into northern Burma. Some records include: 5 years - 10 x 8 feet; 10 years - 13 x 13 feet; largest on record - 20 x 13 feet.
The toothed ( sometimes-smooth edge ) pointed, oval leaves, up to 7 x 3.5 inches, are deep green above, white hairy beneath.
The fragrant, white, saucer-shaped flowers, up to 1.6 inches across, are borne in dense racemes of 5 to 9 during early summer
Hardy zones 6 to 9 preferring partial shade. Tolerates alkaline soil.

Philadelphus floridus ( Beadle Mock Orange )
Also called Florida Mock Orange. A dense, upright, deciduous, large shrub, reaching a maximum height of 10 feet, that is native to Georgia in the southeastern U.S. where it is endangered. It is very similar to P. inodorus var. grandiflorus but the foliage is densely downy beneath.
The lightly toothed to smooth-edged, elliptic, leaves, up to 4 inches, are mid-green.
The very large, fragrant, white flowers are borne in clusters of up to 3 during early summer.
Hardy zones 4b to 9, it is surprisingly hardy despite it's natural range and thrives in the massive Mock Orange collection at Dominion Arboretum in Ottawa, Canada.

Philadelphus hirsutus ( Streambank Mock Orange )
A straggly, medium-sized shrub, reaching up to 6 x 6 feet, that is native to the southeastern U.S. ( from north-central Arkansas to Kentucky to western Virginia; south to central Mississippi to central South Carolina ). It is endangered in Arkansas, Mississippi, Virginia and the Carolinas. It is closely related to P. purpureomaculatus except the flowers are not purple spotted.
The lightly-toothed, ovate leaves, up to 3.2 x 2.2 inches in size, are glossy mid-green above, grayish-white beneath.
The scentless, pure white flowers appear earlier than most other Mock Oranges.
Hardy zones 4b to 8, it is much hardier than it's natural range suggests and thrives at Dominion Arboretum in Ottawa, Canada.

Philadelphus incanus ( Gray Mock Orange )
A deciduous pendulous large shrub to small tree, that is native to central China. Some records include: fastest recorded growth rate - 10 feet; largest on record - 15 x 16 feet with a trunk diameter of 6 inches.
The lightly-toothed, broadly-ovate leaves are up to 7 x 4.5 inches in size. The foliage is mid-green above, very downy gray beneath.
The fragrant, white flowers, up to 1 inches across, are borne 5 to 9 on a raceme during early summer. It blooms later than most other Mock Oranges.
Hardy zones 4b to 8, it is fully hardy at Dominion Arboretum in Ottawa, Canada.

* photo taken on June 23 2013 @ U.S. National Arboretum, DC


Philadelphus inodorus ( Scentless Mock Orange )
Also called Philadelphus grandiflorus. A fast growing, very dense, bushy, arching, large deciduous shrub, that is native to the southeastern U.S. ( from Arkansas to far northern Kentucky to Pennsylvania, south to Louisiana to South Carolina ). Some records include: largest on record - 17 x 12 feet. It is sometimes found naturalized as far north as Wisconsin to central Michigan to Massachusetts. It is endangered in Kentucky and North Carolina.
The oppositely-arranged, lightly-toothed to smooth-edged, oval leaves are up to 5 x 2.5 inches in size. The foliage is glossy deep green above, paler beneath.
The fragrant, white flowers, up to 2 inches across, are borne in clusters of 2 to 9 ( usually 3 ) during early summer. The flowers are not fragrant unlike most members of the genus.
The showy bark is peeling.
Hardy zones 4b to 9 ( fully hardy at Dominion Arboretum in Ottawa, Canada ) in full sun to partial shade on well drained soil.

Philadelphus kansuensis ( Kansu Mock Orange )
A very large, semi-evergreen shrub, that is native to northwest China. Some records include: largest on record - 23 feet. It is very similar and closely related to Philadelphus pekinsnsis.
The ovate leaves, up to 4 x 2.5 inches, are mid-green.
The fragrant, white flowers are borne 5 to 7 on a raceme during early summer.
The deep purple twigs turn grayish-brown during the second year.
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus x lemoinii
A rapid growing, upright to arching, medium-size deciduous shrub, reaching up to 8 x 12 feet. It is of hybrid origin between Philadelphus coronarius & P. microphyllus.
The broadly-oval leaves, up to 2.3 x 1.2 inches in size, are deep green above.
The abundant, very fragrant, pure white flowers, up to 1 inch across, are borne 5 to 7 on a raceme during early summer.
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

* photos taken by Milan Havlis ( havlis.cz )

* historical archive photo


Philadelphus lewisii ( Lewis Mock Orange )
A rapid growing, vase-shaped, deciduous large shrub, that is native to western North America ( from Vancouver Island to Revelstoke, British Columbia to extreme southwest Alberta to central Montana and central Iowa; south to northern California ). Some records include: largest on record - 17 x 10 feet. It is the state flower of Idaho.
The smooth to finely-toothed, oval leaves, up to 4 x 2.5 inches, are bright green turning to yellow during autumn.
The lightly fragrant, silky-white flowers, up to 2 inches across, are borne in clusters of 5 to 11 during early summer. The flowers appear on wood from the previous season. They are very attractive to hummingbirds and bees.
Hardy zones 4 to 8 ( tolerating -30 F and fully hardy at Dominion Arboretum in Ottawa, Canada ) in full sun to partial shade. Very drought tolerant.

* photo of unknown internet source

* photos taken by http://www.nwplants.com


'Blizzard'
Very hardy and attractive, reaching up to 7 x 7 feet in 5 years, eventually 8 x 8 feet or more.
The foliage is deep green.
The very abundant, single, white flowers are borne in clusters. The very long-lasting flowers can persist for an entire month during late spring into early summer.
Hardy north to zone 2b, thriving on the harsh northern Great Plains including much of Alberta.

subsp. californicus ( California Mock Orange )
An upright deciduous shrub reaching a maximum height of 10 feet, that is native from Oregon to central California.
The toothed, elliptical leaves, up to 3.5 x 2 inches, are mid-green.
The fragrant, white flowers are borne in clusters of 3 to 5 ( rarely 20 )during early summer.
The older stems have attractive yellowish-brown peeling bark.
Hardy zones 4 to 8, despite it's natural range it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

'Cheyenne'
Reaches up to 9 x 8 feet with very abundant, fragrant white flowers.
Hardy zones 3 to 8. Looks great planted with lower pink Roses.

'Fallbrook'
Huge flowers, up to 3 inches across.

'Marjorie Schmidt'
Reaches up to 8 x 8 feet, with very abundant, very fragrant, very large, pure white flowers.
Hardy zone 4 +.

'Snow Velvet'
Huge fragrant, semi-double, white flowers, up to 3 inches across; otherwise identical to species. It often repeat blooms during the summer.

'Waterton' ( Waterton Mock Orange )
Originating in Alberta, it forms a bushy, medium-sized shrub, up to 6 x 6 feet.
The abundant, large, white flowers are up to 1.6 inches wide.
Hardy zones 3a to 7.

Philadelphus magdalenae
Also called Philadelphus subcanus var. magdalenae. A deciduous shrub, reaching a maximum size of 16 x 13 feet, that is native to western China.
The smooth-edged, ovate leaves, up to 3.5 x 1 inches, are mid-green above.
The lightly fragrant, single, white, cup-shaped flowers, up to 1 inch across, are borne late spring into early summer
Hardy zones 6 to 9

Philadelphus mexicanus ( Mexican Mock Orange )
A very rare, large, climbing, pendulous branched, evergreen shrub, that is native from Mexico to Guatemala.
Some records include: largest on record - 33 x 15 feet.
The toothed to smooth-edged, oval leaves, up to 4.5 inches in length, are mid-green.
The very fragrant, creamy-white flowers, up to 2 inches across, are borne during early summer.
The flowers generally do not occur in clusters.
The young stems are covered in long bristles
Hardy zones 8 to 10, ( tolerating as low as 10 F with no damage ) in full sun to partial shade.

* historical archive photo


Philadelphus microphyllus ( Littleleaf Mock Orange )
A dense, bushy, erect, small to medium-sized, deciduous shrub, that is native to the Rocky Mountains ( from California to Idaho to Wyoming, south to Arizona and Texas along the Mexican border ).
Some records include: 10 years - 6.5 x 6.5 feet; largest on record - 7 x 7 feet. it is a beautiful fine-textured shrub.
The leaves, up to 2 ( rarely over 1.3 ) inches in length, are felted, turning to smooth mid-green.
The very fragrant, white flowers, up to 1.6 inches across, are borne during early to mid summer.
The bark is attractive and peeling.
Hardy zones 5 to 8 ( seed source from Wyoming should be tested in zones 3 & 4 on the Great Plains ) preferring a hot sunny site.

* photo taken by Patrick J. Alexander @ USDA-NRCS PLANTS Database


'June Bride'
Reaches up to 6 x 6 feet with deep green foliage and larger than average pure white flowers. The very attractive exfoliating bark is reddish-brown.
Hardy zones 4 to 8

Philadelphus x monstrosus
The hybrid between Philadelphus lewisii var. gordonianus & P. pubescens.
A very vigorous, large deciduous shrub to small tree, reaching around 20 feet. Some records include: largest on record - 27 feet.
The leaves, up to 6 x 3 inches, are mid-green above.
The fragrant, white flowers, up to 2 inches across, are borne singly during early summer
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus x nivalis ( Snowbank Mock Orange )
A very large deciduous shrub that may actually correctly be Philadelphus pubescens var. verrucosus. Some records include: largest on record - 18 x 17 feet with a trunk diameter of 16 inches.
The fragrant, white flowers are borne 5 to 9 on a raceme during early summer.
The attractive peeling bark is light brown.
Hardy zones 4 to 8, it is fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus pekinensis ( Peking Mock Orange )
A medium-sized, deciduous shrub, reaching a maximum size of 12 x 10 feet, that is native to north and western China and Korea.
The elliptic leaves, up to 4 x 1.8 inches in size, are mid-green ( sometimes gray-green on purple leaf stalks ). The foliage appears late in spring.
The fragrant, creamy-white flowers, up to 0.8 inches wide, are borne on racemes of 5 to 9 during early summer.
Hardy zones 3 to 8, it thrives in the Mock Orange collection at Dominion Arboretum in Ottawa, Canada.

* photo taken on 4th of July 2010 @ U.S. National Arboretum, D.C.


Philadelphus pubescens ( Hairy Mock Orange )
A vigorous, upright to arching, very large, deciduous shrub, that is native to rich woods of the eastern U.S. ( from Oklahoma to Illinois to Massachusetts, south to far northeast Texas to Mississippi to northern Georgia to South Carolina ). Some records include: largest on record - 20 x 23 feet ( typically closer to 13 feet ). It has reached sizes of up to 15 feet across at Dominion Arboretum in Ottawa, Canada. It is now endangered and extremely localized in every state it resides in except for Arkansas and Tennessee. It is useful for screening.
The leaves, up to 5 x 2 inches, are deep green above, hairy white beneath.
The fragrant, white flowers, up to 1.5 inches across, are borne up to 9 on a raceme during early summer.
The stems are gray with non-peeling bark.
Hardy zones 3b to 8, it is even hardy in southern Finland and reported to grow in Saskatoon, Saskatchewan.

Philadelphus purpurescens ( Purple Mock Orange )
A stunning, graceful, strong growing, deciduous shrub, reaching a maximum size of 13 x 10 feet, that is native to southwestern China.
The ovate or elliptical leaves, up to 4 x 2 inches, are purplish-green.
The fragrant, white flowers, up to 1.5 inches across, are borne on racemes of 5 to 9 during early summer
Hardy zones 4b to 8, it is fully hardy and thrives in the Mock Orange collection at Dominion Arboretum in Ottawa, Canada.

Philadelphus satsumanus ( Japanese Mock Orange )
An upright, deciduous, large snrub, reaching up to 10 x 6.5 feet, that is native to Japan. The foliage is deep green.
The lightly fragrant, white flowers are not as showy as that of most Mock Orange.
The bark is not peeling.
Hardy zones 4b to 8, it is fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus schrenkii ( Manchurian Mock Orange )
A fast growing, dense, upright, large, deciduous shrub, that is native from eastern Siberia; south to northeast China and Korea. Some records include: largest on record - 17 x 13 feet.
The shallow-toothed, oval leaves, up to 5 x 2 inches, are mid-green, turning to yellow in autumn.
The very fragrant, white flowers, up to 2 inches across, are borne on short terminal racemes of 5 to 7 during early to mid summer
The bark is attractive and peeling.
Hardy zones 2 to 7, it is among the hardiest Mock Oranges for the northern Great Plains and eastern Canada.

Philadelphus sericanthus ( Silk Mock Orange )
A very large deciduous shrub, that is native to southwest and central China. Some records include: fastest recorded growth rate - 8 feet; largest on record - 14 x 18 feet.
The toothed, elliptical leaves, up to 7.5 x 5 inches, are mid-green.
The abundant, unscented, white flowers are borne on racemes of up to 15 during early summer.
The very attractive peeling bark is light brown.
Hardy zones 4 to 8, thrives in the hot humid summers of the Mid Atlantic and southeast. It has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus subcanus
A upright, large deciduous shrub, reaching a maximum size of 20 x 15 feet, that is native to southwest and central China.
The finely toothed ( deeply toothed on vigorous growths ) leaves, up to 6 x 3 inches, are mid-green.
The fragrant, white flowers, up to 1 inch across, are borne in racemes during early summer.
The attractive bark is peeling and light brown.
Hardy zones 6 to 9.

Philadelphus tenuifolius
A very attractive deciduous shrub, reaching up to 10 x 10.5 ( rarely over 8 ) feet, that is native to eastern Siberia, northern China and Korea.
The oblong leaves, up to 4.5 x 2.5 inches, are mid-green.
The fragrant, white flowers, up to 1.3 inches across, are borne in clusters of 3 to 9 during early summer.
Hardy zones 3 to 8, it should thrive on the northern Great Plains and in much of eastern Canada and the northeastern U.S.. It is cold and shade tolerant.

* photos taken by Dr. Nick V. Kurzenko @ CalPhotos


Philadelphus tomentosus ( Fuzzy Mock Orange )
A vigorous, medium-sized deciduous shrub, reaching a maximum height of 10 feet, that is native to the Himalayas ( from Kashmir to Tibet; south to northern India to Nepal to Bhutan ). It is closely related to P. coronarius
The ovate leaves, up to 4 x 2 inches, are mid-green above, downy gray beneath.
The fragrant, white flowers, up to 1 inch wide, are borne on racemes of 5 to 7 during early summer.
The attractive peeling bark is cinnamon-brown.
Hardy zones 4b to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

HYBRIDS

* propagation from softwood cuttings taken during summer.

* photos taken on June 1 2014 @ Maryland Horticulturalist Society garden tour, Columbia

* photo taken on June 11 2014 in Columbia, MD


Philadelphus 'Avalanche'
An upright to arching deciduous shrub, reaching up to 8 x 10 feet in 13 years, eventually slightly more.
The very abundant, fragrant, white flowers, up to 1 inch across, are borne during early summer
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada

Philadelphus 'Beauclerk'
A arching, spreading deciduous shrub, reaching up to 6.5 x 6 feet in 5 years, and an eventual maximum size of 8 x 8 feet.
The broadly oval leaves, up to 3 inches in length, are deep green.
The very fragrant, single, white ( with pinkish-white centers ), cup-shaped flowers, up to 1.5 inches across, are borne during early to mid summer
The dark peeling bark is very attractive.
Hardy zones 3 to 8

Philadelphus 'Belle Etoile'
A compact, arching deciduous shrub, reaching up to 4 feet in 2 years, 6.5 x 8 feet in 5 years and 10 x 12 feet in 10 years, eventually slightly broader. It is the hybrid of Philadelphus coulteri and P. lemoinei.
The broadly-oval leaves, up to 4 inches in length, are deep green.
The abundant, very fragrant, white ( with purplish-red center blotch ) flowers, up to 2.3 inches across, are borne during early summer
Hardy zones 3 to 8, it is among the many Mock Orange that thrive in the collection at Dominion Arboretum in Ottawa, Canada.

Philadelphus 'Boule d'Argent'
A compact, bushy, somewhat arching deciduous shrub, reaching a maximum size of 7 x 7 feet.
The broadly-oval leaves, up to 2.5 inches in length, are deep green.
The fragrant, double, white flowers, up to 1.7 inches across, are borne during early summer
Hardy zones 5 to 8

Philadelphus 'Bouquet Blanc'
A deciduous shrub, reaching a maximum size of 7 x 6 feet.
The ovate leaves, up to 2 inches in length, are mid-green.
The very abundant, fragrant, semi-double, pure white flowers, up to 1 inches across, are borne in large clusters during early summer
Hardy zones 4 to 8 ( reports of 3 on protected sites ). It thrives at least as far north as the Ottawa Valley in Ontario, Canada.

Philadelphus 'Buckleys Quill'
An upright deciduous shrub, reaching a maximum size of 12 x 12 ( rarely over 8 x 7 ) feet.
The ovate leaves, up to 3 x 1.5 inches in size, are mid-green.
The fragrant, double, white flowers, up to 1.5 inches across, are borne during early to mid summer
Hardy zones 4 to 8

Philadelphus 'Dame Blanche'
A compact, bushy, arching deciduous shrub, reaching a maximum size of 7 x 7 feet.
The ovate leaves, up to 2.5 x 1.5 inches in size, are deep green.
The abundant, fragrant, semi-double, white flowers, up to 1.5 inches across, are borne during early summer.
The bark is attractive and peeling.
Hardy zones 4 to 8, it is fully hardy at Dominion Arboretum in Ottawa, Canada where it is considered among the most beautiful of all Mock Oranges trialed.

Philadelphus 'Etoile Rose'
A deciduous shrub, reaching a maximum size of
The leaves, up to 3 x 1.2 inches, are green above, beneath.
The lightly fragrant, white ( reddish center ) flowers, up to 1.7 inches across, are borne during early summer
Hardy zones 5 to 8

'Frosty Morn'
A compact, rounded shrub, reaching up to 6.5 x 6.5 feet in 10 years.
Very fragrant, double, pure white flowers.
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

* photos taken by Milan Havlis ( havlis.cz )


Philadelphus 'Galahad'
A dense, compact, arching to rounded, medium-sized shrub, reaching up to 7 x 4 feet in 10 years, with an eventual maximum size of 8 x 6 feet. It looks spectacular arching over a wall. This hybrid was developed at Dropmore, Manitoba and is one of the most beautiful of all the Mock Oranges.
The foliage is deep green.
The very showy, very fragrant, hanging, single, pure white flowers are borne during early summer.
Hardy zone 3a to 7, it is among the hardiest of all Mock Orange hybrids.

Philadelphus 'Glacier'
A compact, medium-sized, deciduous shrub, reaching a maximum size of 5 x 5 feet.
The ovate leaves are up to 1.8 inches in length.
The fragrant, double, white flowers, up to 1.5 inch across, are borne during mid summer
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus 'Innocence'
A fast growing, upright to arching, deciduous shrub, reaching up to 6.5 x 5 feet in 5 years, 9 feet in 8 years, and an eventual maximum size of 10 x 12 feet.
The ovate leaves, up to 2 inches in length, is splashed with yellow or creamy-white.
The abundant, fragrant, semi-double, white flowers, up to 1.5 inches across, are borne 7 to 9 on a raceme during early summer.
Hardy zones 4 to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada.

Philadelphus 'Manteau d'Hermine'
A compact, bushy, spreading, deciduous shrub, reaching up to 3.3 x 4 feet in 5 years, and an eventual maximum size of 5 x 6 feet. Some records include: 10 years - 4 x 5 feet.
The small, broad oval leaves, up to 2 x 1.2 inches in size, are mid-green.
The very fragrant, large, double, creamy-white flowers, up to 1.6 inches across, are borne in clusters during early summer. The flowers are pink to red in bud.
Hardy zones 4b to 8, it has proven fully hardy at Dominion Arboretum in Ottawa, Canada. Tolerant of salty ocean winds and urban pollution.

Philadelphus 'Miniature Snowflake'
A deciduous shrub, reaching a maximum size of 4 x 4 feet.
The leaves are mid-green.
The very fragrant, double, white flowers, up to 1.5 inches across, are borne during early summer
Hardy zones 3 to 8

Philadelphus 'Minnesota Snowflake'
A dense, large, deciduous shrub. Some records include: fastest recorded growth rate - 5 feet; 10 years - 10 feet; 5 years - 8 x 6 feet ( avg ); largest on record - 15 x 15.5 ( rarely over 12 x 12 ) feet.
The large leaves, up to 5 x 4 inches, are mid-green, turning to yellow late in autumn.
The abundant, very fragrant, double, white flowers, up to 2 inches across, are borne during early summer
Hardy zones 3 to 8, tolerating as low as -30 F or even colder on protected sites. It even grows in Alberta.

Philadelphus 'Natchez'
An upright, arching, deciduous shrub, reaching a maximum size of 10 x 12 feet.
The foliage is glossy deep green above, bright green beneath.
The fragrant, single, pure white flowers, up to 2 inches across, are borne during early summer
Hardy zones 4 to 8.

Philadelphus 'Polar Star'
A rapid growing, deciduous shrub, reaching up to 12 x 10 feet.
The ovate leaves are glossy, deep green.
The fragrant, double white flowers, up to 2.5 inches across, are borne during early summer, often repeating during autumn.
Hardy zones 5 to 8.

Philadelphus 'Silver Showers'
A bushy, arching deciduous shrub, reaching up to 4 x 5 feet in 5 years and 6 x 5 feet in 10 years. It makes a great natural hedge.
The foliage is deep green.
The very fragrant, solitary, single, pure white flowers are up to 2 inches across.
Hardy zones 4b to 8

Philadelphus 'Snow Dwarf'
A moderate growing, compact, upright to arching, small shrub, reaching a maximum size of 5 x 4 ( rarely over 4 ) feet.
The oval leaves, up to 2 inches in length, are deep green.
The abundant, very fragrant, very large, pure white flowers, up to 1.5 inches across, are borne during early summer.
Hardy zones 4 to 7 in full sun to partial shade, it thrives even on the northern Great Plains.

* photo taken on May 17 2012 in Columbia, MD

Philadelphus 'Snowgoose'
Fast growing, upright and rounded, reaching up to 5 x 5 feet in size.
The ovate leaves, up to 2.5 inches in length, are deep green.
The white double flowers, up to 2 inches across, are borne late spring into early summer.
Hardy zones 4 to 8 ( reports of 3 in Saskatoon, SK ).

* photos taken by Milan Havlis ( havlis.cz )


Philadelphus 'Starbright'
A vigorous, dense, upright shrub, reaching a maximum size of 10 x 10 feet, that was developed in Newfoundland at the Memorial University Botanical Garden. Some records include: 3 years - 5 feet. It is similar to one of its parents P. delavayi melanocalyx ( the other parents is P. lewisii ) but is 3 zones hardier.
The leaves, up to 5 x 3 inches in size, are very deep purple at first, turning to deep green.
The very abundant, large single, white ( with deep purple calyx ) flowers, up to 2.2 inches wide, are borne during late spring.
This cultivar does not produce seed.
Hardy zones 3 to 7 in full sun to partial shade. It is extremely cold hardy as well as tolerant of drought and urban conditions.

Philadelphus 'Sybille'
A gracefully arching deciduous shrub, reaching a maximum size of 6.5 x 7 ( rarely over 5 ) feet.
The leaves, up to 2 inches in length, are mid-green above.
The fragrant, white ( blotched purple in the center ) flowers, up to 2 inches across, are borne during early summer
Hardy zones 3 to 8

Philadelphus 'Virginalis'
A vigorous, deciduous, large shrub, reaching a maximum size of 17 x 10 feet. Some records include: 10 years - 17 feet. It is the hybrid between Philadelphus nivalis 'Plenus' x P. lemoinei.
The leaves, up to 4 inches in length, are deep green above.
The very fragrant, double, white flowers, up to 2.3 inches across, are borne in loose clusters of 3 to 7 during early summer
Hardy zones 3 to 8.

* photo taken by Milan Havlis ( havlis.cz )

* historic archive photo


Philadelphus 'White Rock'
An arching deciduous shrub, reaching up to 12 x 12 ( rarely over 8 ) feet in size.
The foliage is rich deep green.
The very abundant, huge, fragrant, pure white, semi-double flowers are up to 2 inches wide.
Hardy zones 5 to 8.

Philadelphus 'Zeyheri' ( Zeyher's Mock Orange )
A very vigorous, medium-sized deciduous shrub, reaching a maximum size of 12 x 12 feet. It has at least some Philadelphus coronarius parentage through it's exact identity is unknown.
The leaves, up to 4 x 2 inches, are mid-green.
The scentless, large, pure white flowers, up to 1.7 inches across, are borne during early summer.
Hardy zones 4 to 8 ( possibly 3...it thrives at least as far north as the Ottawa Valley in Ontario ).

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