False Sunflower
Heliopsis helianthoides
False sunflower (sometimes called ox-eye sunflower) is a hardy native perennial of eastern and central North America, increasingly planted across the prairies for its long bloom and high pollinator value. Looks like a small daisy-shaped true sunflower but it is a perennial (true sunflowers, Helianthus annuus, are annuals) and produces dozens of golden-yellow flowers per plant from late June through September. Hardy to Zone 3 throughout Alberta, including Edmonton. A classic 'no-fuss' perennial for the middle of the border: tolerant of heat, clay, and brief drought; long-lived; and supports a wide range of native bees, butterflies, and beneficial wasps. Excellent compromise plant for gardeners who want a sunflower aesthetic without committing to replanting every year. Cultivars worth seeking: 'Tuscan Sun' (compact, 50 to 60 cm), 'Summer Sun' (semi-double flowers), 'Bleeding Hearts' (red-and-yellow bicolour).
Quick Facts
Distribution
Native to eastern and central North America (not native to Alberta). Hardy garden perennial across the province (Zone 3 reliably; Zone 2 with snow cover).
Light
Full sun to part sun. Will lean toward the light if shaded.
Bloom Time
Late June through September (one of the longest-blooming hardy perennials)
Soil
Adaptable. Tolerates clay, loam, and lean ground. Best in moderately fertile, well-drained soil.
Water
Moderate. Drought-tolerant once established but flowers longer with consistent moisture.
Growing & Cultivation
Best Planting Time
Spring (late April through May) or early fall. Plant out from nursery pots once frost risk is past.
Propagation
Seed (cold-moist stratify 30 days for best germination; germinates in 10 to 14 days at 21 C). Division of established clumps in spring every 3 to 4 years. Seedlings of named cultivars may not come true.
Pruning / Splitting
Deadhead spent flowers to extend bloom. Cut entire plant to the ground after killing frost or leave standing stems for winter interest and bird seed.
Seed Collection
Let some flowers go to seed in September. Cones dry on the plant; rub them between your hands over a tray to release seed. Light required for germination, so surface-sow.
Spacing
45 to 60 cm.
