Description
Helianthus annus Mammoth Russian
Type: Annual
Bloom: Summer
Flower: 12″ wide gorgeous yellow or gold flower heads with dark centers
Height: 10′ tall
Light: Full Sun
Soil: Well drained
P.H.: 6-7.5
Moisture: Moderate. Generously in dry weather
Zone: 4-11
Use: Most notably for it’s oil seed
Problems: Support during winds
Notes: Fertilize in Spring to promote large flower heads
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