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Oxeye Sunflower - Heliopsis helianthoides
sunflower is a large coarse perennial growing up to 5 ft (1.5 m)
tall from a heavy fibrous rootstock. The thin 3-6 in (7.6-15.2 cm)
dark green ovate leaves have sandpapery surfaces (both above and
below) and toothed margins. They grow on short petioles, usually in
opposite pairs, but sometimes arranged in whorls of three.
From midsummer into fall, the plants bear 2 in (5.1 cm) flowers
scattered singly atop loosely branched tall bare stems. The ragged
daisylike blossoms are composed of 10-16 pointed yellow ray flowers
and numerous orange disc flowers which mature into smooth 4-angled
Growth Habit: Forb/herb
U.S. Nativity: Native
Growing Oxeye Sunflower
Oxeye sunflower will grow in almost any moderately fertile soil.
Oxeye sunflower prefers full sun, but will tolerate partial shade.
Oxeye sunflower likes good drainage and will tolerate dry
conditions, but it performs best where the soil stays moist all
summer. This species tolerates both severe winters and hot summers
well. Heliopsis is easy to grow from seed. Sow the seeds outdoors
about two weeks before the last frost. To produce transplants,
start them in a greenhouse six to eight weeks before last frost. At
68-70ºF (20-21 ºC), the seeds will germinate in 1-2 weeks. Be sure
to keep the young plants evenly moist. To propagate oxeye
sunflowers vegetatively, take cuttings from non-flowering shoots in
the summer or divide the clumps while they are dormant. New plants
can be potted up in the fall and set out in the spring.