why are my cosmos plants twisting and curling?

Question

Cosmos plant twisting and curling. Why?

Answer 1

While cosmos are generally pretty tough, there are a number of factors that could cause this, such as viral or bacterial disease, bugs such as aphids or thrips, or imbalance in fertilizer, pH, even insecticide chemicals.
This article has general growing information: https://www.gardeningknowhow.com/ornamental/flowers/cosmos/growing-cosmos.htm
If the problem is affecting too many plants, or seems to be worsening, you might want to take samples to the Extension Service, where they can analyze and suggest cures, This article will help you find one: https://www.gardeningknowhow.com/extension-search/