Black-eyed Susan in a garden
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The Beautiful Flower You Shouldn't Plant Next To Black-Eyed Susans
Cosmos and black-eyed Susan are two wildflowers that, despite being sun-lovers and drought-tolerant, don't make the best neighbors in a garden due to their
height difference.
Cosmos can tower up to 7 feet, overshadowing the much shorter Susans that grow to just about 2 feet. If the latter are surrounded by cosmos, their survival becomes less likely.
Moreover, the tall, lanky stems of cosmos need support to prevent them from breaking, especially in windy conditions, and Susans can't provide that because of their short height.