Fennel is that housemate who takes your food, hogs the space, and makes everything smell weird – best kept far from your eggplants!
The next three ‘bad’ companions for eggplants all belong to the same plant family – nightshades. Potatoes and eggplants attract similar pests, including Colorado potato beetles, and share susceptibility to diseases like blight.
Another eggplant relative, heavy-cropping tomatoes will compete for nutrients in the soil, reducing the overall yield of both plants. They are prone to the same pests and diseases, so growing them together increases the risk of problems.
Like tomatoes and potatoes, peppers share susceptibility to similar pests and diseases, making them risky companions for eggplants.
Corn is a greedy feeder, outcompeting eggplants for vital nitrogen in the soil. Your corn plants may also attract pests such as earworms and aphids that can quickly spread to eggplants. How to Freeze Corn
The long, deep roots of carrots can disrupt the delicate root system of eggplants. They also compete for space and nutrients, making them less than perfect companions.
Beets can slow down the growth of eggplants by competing for nutrients in the soil. These two crops also prefer different soil conditions and temperatures, making them a poor match.