Sunflowers Are Poisonous? Posted on 16 July 202123 August 2021 By gkplus_jr1 No Comments on Sunflowers Are Poisonous? Sunflowers are beautiful but they do not allow other plants to grow near them. They give out poison that is harmful to other plants. Squirrels love sunflower seeds and can always be spotted near sunflower plants. Weird But True