Heliopsis helianthoides 'Summer Sun' / False Sunflower / Seeds

(Code: ES_108)
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Heliopsis helianthoides 'Summer Sun' / False Sunflower / Seeds

Heliopsis ‘Summer Sun’ is a rich and long flowering variety of False Sunflower.  Plants grow about 1m tall, with masses of double to semi-double flowers from June to August.  These are excellent border plants, fitting in with a wide range of planting styles, often grown in Prairie and wilder/informal gardens.  

False Sunflowers grow best in a sunny position in fertile well-drained soil.  They are drought tolerant once established and do not generally need staking, except in the most exposed gardens.  They attract pollinators. 


Pack of approx 100 seeds.  Sow in winter and spring and germination takes 2-4 weeks, sometimes requiring chilling in a fridge to break seed dormancy.   Early sowings flower in the 1st year.  Sowing instructions and a colour photo are printed on the packet. 

See how your seeds are packed.

Hardiness Hardy deciduous perennial (RHS Hardiness H6)
Flowers June to August
Height 100 - 120cm
Spread 50 - 80cm
Conditions  Full sun and fertile well-drained soil

Sow the seeds in winter and spring in a tray of compost.  Cover the seeds very lightly with compost and do not exclude light, which helps germination.  Keep the tray at 20°C and seedlings emerge in 3-4 weeks.  If there is no germination, place the tray in a fridge for 2-4 weeks and back into the warmth for germination.  Or sow the seeds in late autumn and winter in a tray of compost and keep in a coldframe or unheated greenhouse for germination in the spring.  Transplant the seedlings into small pots when they are big enough to handle and plant out into the garden after hardening off.  Trim back the growing tips on transplanting to encourage branching.  Protect young plants from slugs.

Grow Plants flower in the first or second year from sowing.  They die back naturally in winter, when they can be cleared up, and start growing again in spring.  Deadhead plants to encourage more flowers.  Stake plants in exposed gardens.  Mature clumps can be divided in spring or autumn, every 2-3 years.  Basal cuttings can be taken in spring.