Planting Seeds of Friendship. Rebecca March 24, 2011. Sunflowers. Three facts . Helianthus Annual The sunflower has a rough, hairy stem, broad, coarsely toothed, rough leaves and circular heads of flowers. Plant Details.
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March 24, 2011
Keep the soil moist and feed a liquid fertilizer. Do not over-water, as this can cause yellowing of the leaves. The sunflower's most critical time for water is from 20 days before to 20 days after flowering. Weeding of the sunflower's bed should be performed to prevent competition for water and nutrients.