Genus: Ox eye

Heliopsis

Photo/Illustration: 
Courtesy of White Flower Farm
Ox eye (Heliopsis)
hee-lee-OP-sis
Asteraceae
This genus contains a dozen or so species of North American perennials from dry prairies and open woodland. On top of stiff stems bloom yellow (the most common color) sunflower-like flowers over a long time from summer to autumn. Grow in a border, meadow, or cutting garden.
Noteworthy characteristics:  North American natives. Hardy and vigorous. Long-lasting cut flowers that resemble sunflowers.
Care:  Grow in full sun and moderately fertile, humusy, moist but well-drained soil. Stake as needed, and divide every 2-3 years.
Propagation: 

Divide plants in spring or fall, or root basal cuttings in spring. To start from seed, sow in a cold frame in spring.

Problems: 

Powdery mildew, rust.

Species, varieties and clutivars for genus Heliopsis

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False sunflower
Heliopsis helianthoides
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False sunflower
Heliopsis helianthoides 'Summer Nights'