Potatoes are susceptible to the same pests and diseases as blackberries, particularly aphids, blight, and rust.
Tomatoes and blackberries share many common pests, including aphids, whiteflies, and hornworms.
Raspberries and blackberries are closely related and share susceptibility to the same pests and diseases, such as raspberry beetles and verticillium wilt.
Blackberries will outcompete eggplants for all these growth-boosting essentials and increase the risk of soil-borne diseases like Fusarium wilt.
Cabbages and other brassica crops are incredibly greedy feeders, quickly depleting nutrient levels in the soil.
Fennel has very few friends in the garden, as it produces a chemical that can inhibit the growth of nearby plants.