Corn: Tomatoes and corn are both heavy feeders and compete for nutrients in the soil, leading to stunted growth and lower yields for both crops.
Potatoes: Both tomatoes and potatoes are susceptible to similar diseases like late blight. Growing them together increases the risk of widespread infection.
Brassicas (Cabbage, Broccoli, Cauliflower): Brassicas release compounds that inhibit tomato growth and can stunt their development.
Fennel: Fennel produces chemicals that can negatively affect the flavor of tomatoes and inhibit their growth.
Walnuts: Walnut trees release juglone, a toxin harmful to many plants including tomatoes, inhibiting their growth and causing wilting.
Dill: Dill attracts tomato hornworms, a common pest that can decimate tomato plants if left unchecked.
Kohlrabi: Kohlrabi competes with tomatoes for nutrients and space, leading to reduced yields for both crops.