Sunday, January 17, 2010

Boxwoods

Buxus
A genus of around 50 species of evergreen, deer resistant shrubs or small trees native to Eurasia, Africa, Central America and the Caribbean.
They have oval, smooth edged leaves arranged in opposite pairs on the twigs.
The leaves and stems are poisonous to and occasionally kill livestocks.
Boxwoods prefer soil PH from 6.7 to 7.5 and foliage has bronze leaf tips on acidic soil in which case dolomite lime should be used. Fertilization is best in October.
Boxwoods do not like clay; if they are planted on clay add gypsum to the soil to change the soil structure.
The English Boxwood is toxic to leaf minors though other Boxwoods may be eaten by such. Boxwood Psylids may curl the leaves, they can be treated with a systemic insecticide such as Bayer.
A 1 inch mulch is very important since Boxwoods like cool soil. Boxwood roots stop growing at 84 F and die at 91 F. Orange stem color is a sign that a Boxwood is not happy. Root rot may occur on swampy sites.
Boxwoods prefer partial shade though will grow in sun ( if not too hot ) and in deeper shade on most well drained soils including chalk.
Boxwoods are often used as hedges and can be sheared. Boxwoods can also be left to natural shape which is rounded and more open and some are trees which can be limbed up. Thinning greatly reduced fungal diseases. If a Boxwood hedge is cluttered with dead shaded out wood in its interior; all that should be thinned out to maintain good health. A new disease of Boxwoods called Boxwood Blight has recently showed up in the U.S. More info on boxwood blight can be found at www.boxwoodblight.org. Seed germinates easily but Boxwood is usually reproduced from cuttings which root easily during most of the year, especially summer.





Buxus balearica ( Balearic Box )
An upright, somewhat conical tree that is similar to Buxus sempervirens except with larger, thicker leaves. It is native to the Balearic Islands, south and eastern Spain & Sardinia. It grows vigorously to 30 feet. Some records include: 20 years - 27 feet; largest on record - 80 feet with a trunk diameter of 2 feet. Large trees are now rare as they take a very long time to reach large size and it was harvested for its timber pre 1900.
The oval leaves are up to 6 ( averaging 2 ) inches in length and are notched only slightly at the tip. The leathery leaves are the largest of any Boxwood.
Hardy zones 7 to 10 possibly only north to 8.

* photos taken on May 1 2010 @ U.S. National Arboretum, D.C.




Buxus harlandii ( Harlands Boxwood )
This is among the most beautiful of all Boxwoods, forming a shrub or small tree, native to southern China. It is bushy and vase-shaped, typically reaching around 5 feet though on ideal sites may be moderate growing ( up to a foot per year ) and is known to grow to as much as 33 x 6 feet.
The leaves, up to 2 x 0.8 inches in size, are narrower than most Boxwood. The new foliage emerges early in spring and turns to very glossy, deep green.
The bark is whitish.
Hardy zones 7 to 11, as far north as Philly. Heat tolerant.

'Richardii'
Rapid growing with larger leaves. A great Boxwood for the south.

* photos taken on Oct 21 2014 @ Smithsonian Inst., Washington, DC




Buxus henryi ( Henry's Boxwood )
A moderate growing, upright-oval, medium-sized, evergreen shrub reaching a maximum height of 10 feet that is native to Hubei, Sichuan and Ghizhou Province in central China. Rare in the wild and even in cultivation despite its attractiveness.
The lance shaped or oblong leaves, up to 5 x 1.5 inches in size, are glossy mid-green.
Hardy zones 6 to 9.

* photo of unknown internet source


Buxus hyrcana ( Caucasian Boxwood )
Also called Buxus colchica. Native to southwestern Russia; south to Turkey to Azerbaijan; this species was actually formerly considered a subspecies of Buxus sempervirens. It is fast growing for a Boxwood ( up to 6 inches per year ) reaching a size of 16 x 16 feet or sometimes becoming a small tree. It has become endangered in the wild due to the destruction of the forests where it grows.
The leaves are large for a Boxwood, up to 1.6 inches in length. The foliage is deep blue-green.
Hardy zones 7 to 9

Buxus macowanii ( Cape Box )
A crooked trunked small tree with attrative drooping branches, that is native to sand dunes and coastal valleys of South Africa where it reaches a maximum size of 30 feet with a trunk diameter of 1 foot. It can be sheared and makes an excellent hedge.
The leaves, up to 1.5 inches in length, are similar in appearance to that of Buxus sempervirens. The foliage is bright green.
Hardy zones 9 to 11 and is tolerant of deep shade.

Buxus microphylla ( Littleleaf Boxwood )
The Littleleaf Boxwood grows in its wild form to 15 x 15 feet in 35 years and eventually to 20 feeet as a rather open large shrub or small tree. This Japanese, Chinese and Korean native can be told apart from the English Boxwood by its up to 0.7" leaves that are thicker and more rounded or notched at the tip.
Most Littleleaf Boxwood vararities are hardy north to zone 4 however some less desirable forms have their foliage discolor during the winter in cold climates. Another cause of bronzing leaves is acid soil. Boxwoods like alkaline soil and often benefit from applications of limestone ( never use limestone on nearby plants in the Rhodo family ). Upon planting gypsum can be used to break up clay. Fertilization is best done in October to benefit the roots and increase growth the following spring. Leaf minor may be a problem in some areas.

* photo taken on Feb 2009 @ U.S. National Arboretum, DC

* photo taken on August 4 2010 @ Stratford, Ontario

* photo of unknown internet source


* photo taken on June 1 2014 @ Maryland Horticulturalist Society garden tour, Ellicott City


'Chicagoland Green'
A moderate growing, dense, compact, rounded form, reaching up to 4 x 5 feet in 15 years, with an eventual maximum size of 6.5 x 5.5 feet.
The narrowly-elliptical leaves, up to 0.7 inches in length, remain glossy deep green all year.
Hardy zones 4 to 8. It can tolerate -37 F with no dieback! It even grows well in torrid hot Phoenix, Arizona where Buxus sempervirens will not grow.

* photos taken on Apr 16 2015 @ Oakland Manor, Columbia, MD




'Curly Locks' ( Curly Locks Boxwood )
Dense and compact in habit, reaching up to 2 x 4 feet in 20 years and an eventual maximum size of 5 x 13 feet.
The bright green foliage is borne on twisted stems.
Hardy zones 6 to 8, it is reported as surprisingly hardy at zone 4b Dominion Arboretum in Ottawa, Canada though is on a protected site and gets some protection from the often deep winter snows. It survived for 20 years there.

* photo taken on Feb 2009 @ U.S. National Arboretum, DC

* photo taken on Feb 8 2015 @ U.S. National Arboretum, DC


'Faulkner'
Compact, low and spreading in habit. Some records include: fastest growth rate - 5 inches; 20 years - 5 x 5 feet; largest on record - 10 x 10 ( rarely over 6 x 5 ) feet.
The rounded, very glossy bright green leaves, up to 0.8 x 0.3 inches, are borne on reddish-brown stems.
Hardy zones 4 to 8 ( possibly 3 on very protected sites ).

'Goddard College'
Large in size, reaching up to 6 x 6 feet.
Hardy zones 4 to 8 and even survived -38 F in Vermont.

'Golden Dream'
A slow to moderate growing, very dense, compact, rounded, small shrub, reaching a maximum size of 4 x 4 feet. Some records include: fastest growth rate - 1 foot.
The bright green leaves are boldly margined golden-yellow.
Hardy zones 6 to 9.

* photo taken on June 18 2013 in Howard Co., MD

* photo taken on June 30 2013 @ U.S. National Arboretum, DC


'Green Beauty'
Moderate growing, upright and compact to 6 x 4 ( rarely over 4 ) feet in 10 years, eventually reaching a maximum size of 8 x 6 ( rarely over 6 ) feet.
The foliage is glossy deep green throughout the year.
Less hardy than many selections, hardy only north to zone 6 and killed at -10 F.

* photo taken on Aug 23 2014 @ Smithsonian Inst, Wash., DC


'Green Gem'
Slow growing, very dense and compact in habit, reaching up to 3 x 3 feet in 6 years and eventually to 6 x 6 feet. Some records include: fastest growth rate - 1.5 feet. It makes a great formal low hedge.
The leaves, up to 0.8 x 0.3 inches, remain rich green throughout the year.
Hardy zones 4 to 8

* photos taken on Apr 22 2015 in Columbia, MD



'Green Ice'
A moderate growing, dense, upright, rounded, small shrub, reaching up to 3 x 3 feet in 5 years, eventually to 4 x 4 feet.
The oval leaves are blue-green at first, turning to glossy deep green. The foliage remains a good green color during winter.
Hardy zones 4 to 8.

* photos taken on August 3 2010 @ University of Guelph Arboretum, Ontario



'Green Mound'
A moderate growing, dense, compact, rounded form, reaching up to 3 x 3 feet in 10 years, with an eventual maximum size of 6.5 x 5.5( rarely over 3 x 3 ) feet.
The narrowly-elliptical leaves, up to 0.7 inches in length, remain glossy deep green all year.
Hardy zones 4 to 8 ( protected sites on 4 )

* photo taken on Apr 16 2015 in Columbia, MD

* photo taken on Feb 26 2017 in Columbia, MD


'Green Pillow'
A dwarf, compact form, that forms a very dense, flat-topped to rounded cushion, up to 1.5 x 1.5 feet in 10 years, 3 feet in 18 years. It can reach an eventual maximum size of 3.5 x 4 feet.
The small, rounded foliage is deep green.
Hardy zones 5 to 8.

* photo taken on May 8 2010 @ U.S. National Arboretum, D.C.


'Green Prince'
Reaches up to 4 x 4 feet in 10 years, eventually more.
The large, rounded leaves are deep green.
Hardy zone 5 to 8.

'Green Velvet'
A compact pyramidal to upright-rounded form, reaching up to 4 x 4 feet in 10 years, with an eventual maximum size of 6 x 6 feet. Some records include: fastest growth rat - 10 inches.
The leaves, up to 0.8 x 0.3 inches, are deep blue-green.
Hardy zones 5 to 8.

'Huron'
Similar to Buxus 'Green Mountain'; it is vigorous and pyramidal in habit, reaching up to 5 x 5 feet in 10 years, eventually more.
The foliage is bright green, turning to glossy deep green. The foliage usually remains a healthy green during winter.

'Jade Pillar'
Moderate growing and narrow, upright-columnar, reaching up to 5 x 2 feet.
The foliage is deep green.
Hardy zones 5 to 8.

japonica ( Japanse Boxwood )
Open and spreading bushes, reaching up to 6.5 x 6.5 feet in 10 years and eventually much larger. The largest on record is 17 x 27 feet. This Japanese native is fast growing for a boxwood, often up to 1 foot per year.
The leaves are up to 1.5 inches in length. The foliage is glossy deep green.
The smooth bark is grayish-white.

* historic archive photo


'Jim Stauffer'
Vigorous, dense and rounded, reaching up to 4 x 4 feet in 15 years, eventually 5 x 5 feet or larger.
The foliage is glossy deep green throughout the year.
Hardy zones 5 to 8, it is hardier than the similar looking 'Green Beauty'.

* photos taken on May 6 2010 @ Brookside Gardens, Wheaton, MD



'John Baldwin'
A dense, upright form, reaching up to 3 x 3 feet in 10 years and eventually to as large as 7 x 8 feet after many years.
The leaves, up to 0.8 x 0.3 inches, are bright green to blue-green.
Hardy zones 5a to 8

'Justin Brouwers'
Dense and compact, reaching a maximum size of 4 x 4 feet though averaging just 3 feet in 20 years.
Foliage is glossy deep green and retains that color well during the winter.
Hardy zones 6 to 8.

var koreana ( Korean Boxwood )
Loose and open shrubs reaching up to 2 x 3.5 feet in 10 years, eventually to 5 x 8 ft. Slow growing.
The leaves, up to 0.8 inches leaves turn bronze in winter.
Hardy north to zone 4, reported as fully hardy at Dominion Arboretum in Ottawa, Canada.

'Morris Midget'
Very slow growing, forming a low, mounded shrub; reaching up to 2 feet in 15 years, with an eventual maximum size of 3 x 4 feet.
The small, obovate leaves, up to 0.5 inches long, are mid-green, turning to yellow-green during winter.
Hardy zones 4 to 8 and is known to tolerate -35 F.

'National'
A moderate growing, upright, large shrub or small tree. It can reach up to 8 feet in 10 years, 15 x 15 feet in 35 years and even up to 30 x 20 feet after many years.
It has much larger, oval leaves, up to 1.3 inches in length which is almost double the size for regular Buxus microphylla. The foliage is glossy mid-green.
Hardy zones 6 to 8.

* photo taken on Apr 23 2015 in Ellicott City, MD


'Northern Charm'
Moderate growing, compact and dense, rounded; reaching up to 4 x 5 feet in 15 years with a likely eventual maximum size of 6 x 6 feet.
The foliage is bright blue-green at first, turning to glossy deep green. The foliage then turns to rich blackish-green during winter.
Hardy zones 4 to 8.

'Tide Hill'
A low compact shrub reaching up to 2 x 3 feet in 10 years, 2 x 5 feet in 20 years, and eventually slightly larger. Some records include: fastest growth rate - 7 inches.
The leaves, up to 0.5 x 0.2 inches in size, remain luxuriant bright green even after a severe winter.
Hardy zones 5a+

* photos taken on April 2 2010 in Columbia, MD


* photo taken on May 17 2012 in Columbia, MD

* photo taken on May 25 2014 in Columbia, MD


'Up tight'
Moderate growing, densely, broad-columnar in habit, reaching up to 8 x 2.5 feet in 20 years, eventually up to 13 x 5 feet or more.
The rounded leaves are up to 1.3 ( averaging 0.6 x 0.3 ) inches in size. The foliage retains an excellent deep green color year round.
Hardy zones 5 to 8.

* photos taken on Oct 23 2015 in Ellicott City, MD






'Variegata'
Originating from Buxus microphylla japonica, forms a pyramidal shrub, reaching up to 8 feet in height, with attractive foliage that is green with a creamy-white edge.
Hardy zones 6a+

'Winter Gem'
Fast growing for a Boxwood ( up to 5 inches per year ), reaching up to 3 x 3 feet in 10 years and a maximum size of 6 x 6 feet.
The leaves, up to 0.9 x 0.6 inches, are glossy mid-green throughout the year.
Hardy zones 4 to 8



* photos taken on Aug 23 2013 in Columbia, MD



* photo taken on May 18 2015 in Columbia, MD

* photo taken on Sep 23 2015 in Columbia, MD


Buxus sempervirens ( English Boxwood )
A large evergreen shrub or small tree native to a wide area from Europe into western Asia and the far northwest of Africa. Even though it is called English Boxwood, due to its centuries of popularity as a hedging plant there, it is only native to a very small part of southern England. Native to open woods, this Boxwood even grows on limestone and chalk. Typically slow growing, eventually reaching up to 15 feet; some records include: fastest recorded growth rate - 1.5 feet; 10 years - 10 x 8 feet; 20 years - 20 x 10 feet; largest on record - 53 x 33 feet with a trunk diameter of 3 feet; largest in PA - 36 feet @ Longwood Gardens. The English Boxwood can live up to 600 years.
The deep green foliage is usually not very glossy. The leaves are up to 1.6 x 0.5 inches in size though usually much smaller. They are oblong and the tip can either be slightly notched, rounded or pointed.
Clusters of creamy green flowers appear at the branch tips during late spring.
The smooth brown bark later becomes gray and corky on older trees.
Hardy zones 5 to 10 ( shade during subfreezing weather is required north of 7 ), propagation is easy from semi-ripe cuttings in summer.
Hedges should be sheared in summer. It can sometimes sprout from old wood but cutting back hard is not recommended.
Prefers a sheltered site in sun or partial shade on moist, mulched, very fertile, well drained soil. Tolerant of pollution.

* photo taken @ Tyler Arboretum on Aug 2004

* photo taken @ Longwood Gardens, Philly on March 1994

* photo taken on March 28 2010 @ U.S. National Arboretum, DC


* photo taken on April 18 2010 @ U.S. National Arboretum

* photos taken on May 16 2010 @ Cylburn Arboretum, Baltimore, MD








* photo taken on 4th of July 2010 in Washington, D.C.

* photos taken on May 17 2012 in Columbia, MD

* photo taken on Sep 3 2013 in Ellicott City, MD

* photos taken on Oct 17 2013 in Olney, MD


* photo taken on Oct 27 2013 in Columbia, MD

* photos taken on Oct 31 2013 @ Hampton Ntl. Historic Site, Towson, MD




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


* photos taken on Apr 11 2015 @ Belmont Estate, Elkridge, MD



* photos taken on Mar 27 2016 in Howard Co., MD



* photos taken on Aug 12 2016 in Howard Co., MD





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

* historic archive photo


'Arctic Emerald'
Vigorous, dense and upright-pyramidal in habit, reaching up to 8 x 5 feet. It usually has a single trunk and excellent branching structure giving it resiliance to snow and ice.
The foliage is bright green at first, later turning to glossy deep green. The foliage generally remains a good green color during winter.
Hardy zones 4 to 8, it is exceptionally cold and wind tolerant.

'Argenteovariegata'
A very compact shrub, some records include: fastest recorded growth rate - 1 foot; 15 years - 8 x 6.5 feet; largest on record - 17 x 17 feet.
The fine-textured, deep gray-green foliage is narrowly-margined creamy-white.

'Asheville'
Very full, vigorous, upright, rounded bush up to 6 x 5 feet.
The foliage is glossy deep green.
Hardy north to zone 5

* photos taken on Apr 28 2015 in Columbia, MD


* photos taken on July 6 2015 in Columbia, MD



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


* photo taken on July 26 2015 @ Niagara Parks Bot. Gardens, Niagara Falls, ON

* photos taken on Apr 14 2016 in Columbia, MD


* photo taken on May 4 2017 in Columbia, MD

* photos taken on June 25 2017 in Columbia, MD




'Aureovariegata' ( Golden Variegated Boxwood )
Vigorous, reaching up to 8 x 8 feet in 10 years; eventually to as large as 17 x 17 feet.
Foliage is green with bold creamy yellow splashing in the center.

'Dee Runk'
A moderate growing ( up to 6 inches per year ), upright, narrow-columnar form, reaching up to 12 x 2.5 feet in 20 years, eventually slightly more.
The leaves, up to 1 x 0.4 inches in size, are glossy deep green.
Hardy to -15 F.

'Edgar Anderson'
Vigorous but compact and broadly-pyramidal in habit, reaching up to 6 x 5 feet.
Hardy zones 5 to 8.

'Elegantissima'
A dense, small shrub; some records include: fastest recorded growth rate - 8 inches; 10 years - 5 feet; largest on record - 8 x 8 feet. It is moderately fast growing for a Boxwood.
The leaves are up to 1 x 0.4 inches, are deep green with a creamy white margin.

* photos taken on Apr 20 2012 in Columbia, MD

* photo taken on Dec 2 2012 in Catonsville, MD

* photos taken on May 7 2014 @ London Town Gardens, Edgewater, MD



* photo taken on June 18 2015 in Columbia, MD


* photo taken on Oct 3 2015 in Catonsville, MD

* photos taken on July 25 2016 in Columbia, MD

* photo taken on Mar 25 2017 in Columbia, MD


'Elizabeth Inglis'
Also called 'Inglis'. Originating in Michigan; this is a billowy, upright, broad-pyramidal shrub reaching up to 5 x 4 feet in 10 years and to 7 x 6 feet in 20 years, eventually more.
The rich green foliage has a bluish cast.
This is very cold hardy ( to zone 5 ) as well as being sun tolerant. Easy to grow and is resistant to mites and boxwood psylid.

'Fastigiata'
Columnar in habit and reasonably vigorous, reaching up to 12 x 5 feet in 20 years and eventually to 20 feet in height.
Hardy north to zone 5.

'Graham Blandy'
Similar to 'Fastigiata' but even more narrow columnar, to 8 x 2 feet in 10 years, eventually reaching a maximum size of 20 x 4 feet. The foliage is deep green.
Tie up plants during winter since splitting during heavy snow / ice can occur.

* photo taken on May 20 2014 in Columbia, MD

* photo taken on Aug 1 2016 in Columbia, MD



'Handworthiensis'
Fast growing, dense, upright and tree-like. Some records include: fastest growth rate - 1 feet; 6 years - 3 feet. Excellent for use in hedging and screening.
The deep green, thick, leathery leaves are larger than average, up to 1.5 x 0.7 inches.

'Hansens Select'
Upright and pyramidal, reaching up to the same size as the species but is hardier north to zone 5.
The attractive foliage is glossy deep green.

'Ickworht Giant'
An upright small tree, that grows fast for a Boxwood ( around 8 inches per year ).
The rounded leaves, up to 1 x 1 inch in size, are blue-green.

'Latifolia Maculata'
A slow growing ( around 5 inches per year ), dense shrub reaching up to 8 feet. The very broad leaves, up to 1 x 1 inch, are pale gold at first, later becoming deep green with yellow variegation.

'Macrophylla'
Leaves much larger than typical English Boxwood. Is also more vigorous, with growth rates up to 2 feet being recorded.

'Marginata'
A vigorous, upright, large shrub, reaching up to 6.5 x 6.5 ( avg ) feet in 20 years and an eventual maximum height of 17 feet. Some records include: largest trunk diameter - 9 inches.
The very handsome, deep olive-green leaves, up to 1.1 x 0.5 inches, are edged with with yellow.

* photo taken on May 1 2010 @ U.S. National Arboretum, D.C.



'Memorial'
Similar to 'Suffruticosa' but more symmetical naturally as well as being faster growing ( maximum size after 100 years + is 17 x 33 feet ).
The foliage is very attractive and has better winter color that 'Suffruticosa'.

'Mont Bruno'
A very dense, compact, rounded, dwarf form; only reaching up to 2.5 feet in 20 years, eventually to 3.3 x 3.3 feet. It originated as a selection from 'Suffruticosa'.
The foliage is bright green, turning to glossy deep green. The foliage turns to bronze during winter.
Hardy zones 4 to 8, it is among the most cold hardy of Buxus sempervirens cultivars.

'Myrtifolia'
Slow growing, eventually reaching up to 6.5 x 8 feet. Some records include: largest on record - 15 feet.
The small, narrow-elliptical leaves, up to 0.8 x 0.3 inches, are glossy deep olive-green.

'Newport Blue'
Fast growing for a Boxwood ( 5 inches per year ) reaching up to 12 x 7 feet.
The attractive foliage is glossy powdery blue-green.
Hardy zones 5 to 8.

'Ponteyi'
Medium sized with drooping branchlets.
Wide, convex, bluish-green foliage.

'Pullman'
Vigorous, dense and rounded to upright, reaching up to 4 x 3 feet in 10 years, with an eventual maximum size of 7 x 7 feet.
The narrowly-elliptical leaves, up to 0.7 inches in length, are deep green.
Hardy zones 4 to 8, tolerating as low as -35 F. The new growth is not usually prone to late spring freezes.

'Rotundifolia'
Fast growing, upright and rounded; reaching up to 5 x 4 feet in 10 years; 10 x 9 feet in 20 years. Very fast growing for a Boxwood, growth rates of 1 foot are common.
The rounded leaves, up to 1 x 1 inch, are glossy deep green.
Hardy north to zone 5

* photo taken on May 1 2010 @ U.S. National Arboretum, DC



'Salicifolia'
Tree-like in habit, reaching up to 25 x 15 feet. The willow-like, narrow lance-shaped leaves, up to 1.3 x 0.3 inches, are glossy deep green.

'Schmidt'
Vigorous, dense, upright, oval in habit, reaching up to 3 x 3 feet in 10 years, to 7 x 4 feet in 20 years, eventually larger.
The narrow leaves are glossy deep green, usually retaining good green color during the winter.
Hardy zones 5 to 8.

'Suffruticosa'
Dense, erect, and very slow growing to 3.3 x 2 feet in 10 years. This Boxwood is often used for very low hedges though after many decades may become a respectable sized shrub ( largest on record - 17 x 33 feet ).
The oval leaves are bright green at first turning to deep glossy green and up to 0.7 x 0.3 inches.

* photo taken on Oct 2010 in Crownsville, MD


* photos taken on May 17 2012 in Howard Co., MD

* photo taken on Sep 3 2013 in Ellicott City, MD

* photos taken on Sep 27 2013 in Laurel, MD




* photo taken on June 1 2014 @ Maryland Horticulturalist Society garden tour, Ellicott City

* photos taken on Apr 11 2015 in Columbia, MD

* photos taken on Apr 11 2015 @ Belmont Estate, Elkridge, MD


* historical archive photo


'Vardar Valley'
A densely mound forming shrub that is hardier than the typical English Boxwood. It grows vigorously though never tall, reaching up to 7 feet in 40 years with the largest on record being 8.3 x 23.3 feet ( Arnold Arboretum, Boston ). Growth rate is up to 4 inches per year.
The foliage is blue-green in summer and deep green in winter.
Hardy zones 4 to 8 and known to survive as low as -35 F in Maine.
Tolerant of sun, wind and more cold than just about any other Boxwood.

* photos taken on Mar 18 2017 @ Brookside Gardens, Wheaton, MD




'Variegata'
A slow to moderate growing shrub, reaching up to 8 x 8 ( typically 5 ) feet in 15 years, eventually up to 10 feet.
The foliage is deep green with a creamy-white margin.
Hardy zones 6 to 8 preferring light shade.

* photo taken on Oct 1 2012 in Baltimore Co., MD

* photos taken on Sep 17 2015 in Columbia, MD



Buxus sinica
An evergreen, small tree, reaching up to 20 x 22 feet, that is native to eastern and southern China. It typically reaches around 6 feet in 15 years.
The leathery, broadly-elliptic or oblong leaves, up to 1.5 x 0.8 inches in size, are bright green, turning to glossy mid-green.
The rounded fruits are up to 0.3 inches wide.
Hardy zones 5 to 10 ( varies depending on seed source ).

* photo taken on March 2010 @ U.S. National Arboretum

* photo taken on October 17 2010 @ U.S. National Arboretum, D.C.

* photos taken on Feb 8 2014 @ U.S. National Arboretum, DC



Buxus wallichiana ( Himalayan Boxwood )
An evergreen, small tree reaching up to 10 feet in 20 years and an eventual maximum height of 33 feet. It is native to the Himalayas from Afghanistan to northwest Yunnan Province in China. It is moderately fast growing for a Boxwood, with rates up to 6 inches per year. It may take up to 70 years for it to achieve a trunk diameter of 1 foot.
The oblanceolate leaves, up to 2.5 x 0.5 inches in size, are glossy mid-green.
Hardy zones 5 to 9 in sun or shade. Very hardy and soil tolerant. Himalayan Boxwood requires an average yearly rainfall exceeding 24 inches.

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

* photo taken on Feb 8 2014 @ U.S. National Arboretum, DC



Buxus x Sheridan Hybrids

'Green Mountain'
Fast growing for a Boxwood, eventually reaching 4 x 4 feet in 10 years and eventually as much as 12 x 10 feet with a good dense, pyramidal habit. Some records include: fastest growth rate - 20 feet. It is the largest form other than 'National'.
The leaves, up to 0.8 x 0.4 inches, are deep green and remains so all year.
Hardy north to zone 4.

* photo taken on May 20 2014 in Columbia, MD


* photos taken on May 5 2015 in Columbia, MD



* photo taken on Oct 10 2016 in Columbia, MD

* photo taken on Dec 12 2016 in Columbia, MD

* photo taken on June 25 2017 in Columbia, MD



'Green Tower'
Columnar in habit; it is moderate growing, up to 9 x 2 feet in 10 years, eventually more.
The foliage is glossy mid-green throughout the year.
Hardy zones 5 to 8.

* photo taken on Sep 22 2015 in Columbia, MD


'Winter Green'
Very dense, rounded and fast growing for a Boxwood, reaching up to 4.6 x 3.8 feet in 4 years, to 6 x 5 feet in 10 years, eventually a maximum size of 8 x 8 ( rarely over 6.5 ) feet.
The rounded leaves, are up to 1.3 ( averaging 0.6 x 0.3 ) inches in size.
The foliage retains an excellent deep green color year round.
Hardy zones 5 to 9. It has good resistance to Boxwood Psylid and mites.

* photos taken on May 7 2012

* photo taken on May 10 2013 in Ellicott City, MD


* photo taken on Dec 13 2013 in Ellicott City, MD

* photo taken on May 25 2014 in Columbia, MD

* photos taken on July 23 2014 in Ellicott City, MD


* photo taken on May 5 2015 in Columbia, MD

* photos taken on May 9 2015 in Ellicott City, MD


* photos taken on Oct 15 2015 in Columbia, MD







* photo taken on Oct 19 2015 in Howard Co., MD

* photo taken on Feb 26 2017 in Columbia, MD


'Verdant Hills'
Not a Sheridan raised hybrid but still a Buxus microphylla koreana x B. sempervirens combo. It reaches up to 3.5 x 6 feet with lush foliage that remains green all winter.
Hardy zones 3 to 8

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