Jennifer in the Just Grow Something Gardening Friends Facebook group said, “I've seen, several places now, an argument about whether sunflowers are toxic to other plants around them or whether they are soil cleaners. Can you give us the low-down?”

This was a great question and one that was asked again just a few days later in our Kansas City Area gardening group, as well. The quick answer is everything you've heard about sunflowers is true!

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Resources:

Allelopathic Plants. 7. Sunflower

Sunflower Power! (landhealthinstitute.org)

Potential of Sunflower (Helianthus annuus L.) for Phytoremediation of Soils Contaminated with Heavy Metals

Behaviour of Helianthus annuus L.: an ethogram for sunflower, and the effect of potential competitors on soil nutrient patch use