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How Much Water Do Sunflower Plants Need?. Sunflowers (Helianthus annuus) grow as annuals, with some varieties only living for two months. They thrive in hot weather with full, all-day sunlight, but they require 34 inches of water annually for best growth. Some of that water comes from rain and natural water in the soil, but most is dependent on...

Table of contents How Much Water Do Sunflower Plants Need?
Basic Watering 00:40
Water Concerns 01:24

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