Also called Butter Daisy. An annual.
The golden-yellow flowers appear from late spring into early autumn.
Easy to grow in full sun on just about any fertile, well drained soil.
* photos taken on July 26 2020 in Columbia, MD
Melampodium leucanthum
A mounding long-lived perennial, reaching up to 1.5 x 2 feet, that is native to the western U.S. ( from northwest Arizona to central Colorado to central Kansas; south to northwest Mexico to central Texas ). It is found on dry grassland in the wild.
The linear to lance-shaped leaves, up to 2 inches long, are gray-green.
The fragrant, white flowers, up to 1 inches across, are borne all summer long. Up to 50 flower heads may appear at a time on a plant.
Hardy zones 5 to 9 in full sun on sandy, very well drained soil that is mulched in gravel. It does not like clay. It is extremely heat tolerant.
* USDA-NRCS PLANTS Database
