I did not know this!
"Plants to Avoid Growing With Lettuce
Just as there are good companion plants to grow beside lettuce, there are also plants that will struggle nearby lettuce—or will inhibit your lettuce from growing properly. Lettuce doesn’t grow well near:
Crops in the cabbage family. Try to avoid growing lettuce next to broccoli, brussels sprouts, cabbage, cauliflower, kale, or kohlrabi—while some varieties of lettuce may help these cabbage-family (brassicas) crops to grow, these plants have particular root secretions that can prevent lettuce seeds from germinating.
Fennel. Fennel is a garden crop that doesn’t play well with most other vegetable garden plants, so it’s not recommended for most home gardeners. While it can attract beneficial insects, it can actually serve as an inhibitor to the growth of most other plants—stunting them or even killing them completely."
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Lettuce Companion Planting: 16 Plants to Pair With Lettuce - 2026 - MasterClass
From leaf lettuce to romaine, lettuce is most widely planted salad green in the United States. Lettuce (scientific name *Lactuca sativa*) is quick to plant, and simple to harvest. If you’re planning on planting some lettuce, try out companion planting to help maximize the efficiency and health of your garden.