Learn how to reduce sunflower toxicity, grow sunflower resistant plants, and avoid sunflower seeds under bird feeders. How do you get rid of sunflower toxicity? · sunflowers are deep-rooted plants, and they can easily outcompete other plants for water and nutrients. · sunflowers are allelopathic, meaning they produce toxins that harm other plants. However, they can inhibit the growth of nearby plants due to their allelopathic properties. Sunflowers do not actively kill other plants; This is because sunflowers produce a toxin called thioglycolate, which can damage the roots of nearby plants. In conclusion, sunflowers are not toxic to other plants and in fact, have many benefits to the garden. · the short answer is no —sunflowers dont kill other plants theyre nearby, and this is simply a myth. Sunflowers have an allelopathic nature, meaning they produce and release certain biochemicals that can have detrimental effects on other plants. · sunflowers are a popular garden flower, known for their bright yellow petals and towering height. Do sunflowers kill other plants? Do sunflowers release chemicals that inhibit the growth of other plants? · this is a myth that sunflowers can kill other plants they’re nearby. This can lead to the death of other plants , especially in dry conditions. They provide shade and protection for other plants, improve soil quality, and can even act as a natural pesticide. Are sunflowers toxins? But what many people don’t know is that sunflowers can also be harmful to other plants. The only time sunflowers are a threat is if they are planted with non-companion plants, such as rhubarb, sarah warner, greenhouse manager at the case western reserve university farm, says. Are sunflowers harmful to other plants?