Plant family

Tomatillos belong to the nightshade family, known botanically as Solanaceae. Their close relatives that share many of the same pests and diseases include tomatoes, potatoes, peppers, eggplant, and ground cherries.

Why rotate tomatillos

When tomatillos or other nightshades occupy the same ground year after year, soilborne diseases such as Verticillium and Fusarium wilt, early blight, and root knot nematodes tend to build up in the soil. Insect pests that overwinter nearby, including flea beetles and Colorado potato beetles, also get an easy head start the following season. Because these are hungry plants, repeated cropping in one spot can steadily draw down nitrogen and other nutrients in that root zone.

What to plant after

Tomatillos do well following legumes such as bush beans, peas, or a clover cover crop, which leave extra nitrogen behind for these heavy feeders. Leafy greens and members of the brassica or squash families also make good predecessors, since they are not close relatives and do not carry over the shared nightshade diseases.

What to avoid

Avoid planting tomatillos right before or after other nightshades, including tomatoes, potatoes, peppers, and eggplant, because they share the same wilts, blights, and insect pests that linger in the soil. Following one nightshade with another simply feeds those problems instead of breaking their cycle.

Example rotation

A simple four-year plan for one bed could run like this: Year 1 legumes such as bush beans or peas, Year 2 tomatillos and other nightshades, Year 3 brassicas such as broccoli or cabbage, and Year 4 root crops such as carrots or onions. After the fourth year you return to legumes and begin again, so tomatillos revisit that bed only once every four seasons.

Tips

Keep a simple garden map or notebook each season so you can see where the nightshades grew, and wait at least three years before tomatillos return to the same spot. Grouping tomatillos, tomatoes, peppers, and potatoes together as one rotation block makes it easier to move the whole family as a unit and to slip in a nitrogen-building cover crop during their off years.

General guidance for US home gardens. Adapt to your own crops, soil, and space; your Cooperative Extension office can help with a plan for your area. Page updated Aug 4, 2026.