Plant nitrogen-fixing crops and brassicas after tomatoes to restore soil and break pest cycles
After you harvest tomatoes, the soil is depleted of nitrogen and may harbor tomato-specific pests and diseases. The best follow-up crops are legumes (beans, peas, clover) that add nitrogen back into the soil, or brassicas (cabbage, broccoli, kale) that have different pest pressures and nutrient needs. Avoid planting another nightshade family crop—tomatoes, peppers, eggplant, potatoes—in the same spot for at least two years, because soil-borne diseases like early blight and fusarium wilt survive in the soil and will infect new plants when ready.
The timing depends on your climate and when you harvest. If you pull tomatoes in mid-summer, you have time for a full second crop of fast-growing vegetables. If you harvest in fall, you can plant a winter cover crop that will improve the soil for spring planting.
Key Takeaways
- Legumes like beans and peas restore nitrogen to soil after tomatoes strip it, and they grow quickly enough for a second harvest in the same season.
- Brassicas such as broccoli, cabbage, and kale thrive in tomato beds because they have different pest and disease vulnerabilities than nightshades.
- Never plant tomatoes, peppers, eggplant, or potatoes in the same bed for at least two years, because soil diseases will kill the new plants.
- If you harvest tomatoes in fall, plant a winter cover crop like clover or rye to rebuild soil before spring planting.
- Remove all tomato plant debris, stakes, and cages before planting anything new, because disease spores survive on dead plant material.
Legumes: The fastest nitrogen boost
Beans and peas are the top choice after tomatoes because they fix nitrogen from the air into the soil through a symbiotic relationship with bacteria in their roots. This means you do not have to add fertilizer, and the next crop planted in that bed will have more available nitrogen. Bush beans and snap peas mature in 50 to 70 days, so if you harvest tomatoes by mid-July, you can plant them and harvest before the first frost.
Plant beans or peas directly into the soil after removing tomato plants and debris. They prefer the same full sun that tomatoes need, and they tolerate the same soil pH. Water regularly but do not overwater—beans and peas prefer slightly drier soil than tomatoes. At the end of the season, you can either harvest the mature pods for eating, or let the plants die back and turn them into the soil as green manure, which adds organic matter along with nitrogen.
If you are in a warm climate and harvest tomatoes early, you can even plant a second round of beans after the first crop matures. In cooler zones, plant peas in late summer for a fall harvest, or let them overwinter and produce in early spring.
Brassicas: Cabbage, broccoli, and kale
Brassicas are unrelated to tomatoes, so they do not share the same soil diseases or pests. Cabbage, broccoli, kale, and Brussels sprouts all grow well in beds where tomatoes just finished. They prefer cooler weather than tomatoes, so they are ideal for late-summer planting in most climates. Broccoli and cabbage mature in 60 to 90 days, so you can plant them in August and harvest before winter.
Brassicas need more nitrogen than tomatoes do, but the soil may still be depleted from the tomato crop. Add compost or a balanced fertilizer before planting, or plant them after a legume crop to take advantage of the nitrogen the legumes added. They need full sun and consistent moisture—do not let the soil dry out between waterings. Watch for cabbage moths and other brassica-specific pests, which are different from tomato pests, so your tomato pest management will not have created a population explosion of brassica pests.
Root vegetables and alliums
Carrots, beets, turnips, and onions are also safe to plant after tomatoes because they occupy a different ecological niche and do not attract the same pests. Root vegetables do well in tomato beds because they do not need as much nitrogen as brassicas, and they can tolerate slightly depleted soil. Carrots and beets mature in 60 to 80 days, so late-summer planting works in most zones.
Onions and garlic are excellent choices if you are planting in fall. Garlic is planted in October or November, overwinters in the soil, and is harvested the following summer. Onions can be planted from sets (small bulbs) in fall or spring. Both tolerate poor soil and do not require the nitrogen that tomatoes depleted, so they are low-maintenance additions to a tomato bed.
Cover crops for fall and winter planting
If you harvest tomatoes in September or October and do not plan to plant anything else until spring, a cover crop is the best use of the bed. Clover, rye, vetch, and hairy indigo all grow through fall and winter in most climates, prevent weeds, and add organic matter and nitrogen when you turn them into the soil in spring. Plant cover crop seed directly into the soil after removing tomato plants, water until they germinate, and let them grow until a few weeks before spring planting.
Cover crops are especially valuable if your tomato bed had disease problems, because the dense growth of a cover crop can suppress some soil-borne pathogens. In spring, turn the cover crop into the soil two to three weeks before planting, so it has time to break down and release nutrients.
What to avoid planting after tomatoes
Do not plant tomatoes, peppers, eggplant, or potatoes in the same bed for at least two years. All of these are nightshades, and they share the same soil diseases. Early blight, late blight, fusarium wilt, and verticillium wilt all survive in soil for years and will infect new nightshade plants when ready. If your tomatoes had visible disease (brown spots on leaves, wilting, yellowing), wait three years before planting another nightshade in that spot.
Remove all tomato plant material—stems, leaves, roots, and fallen fruit—before planting anything new. Disease spores survive on dead plant material and can infect new crops. Do not compost diseased tomato plants unless your compost reaches 140°F (60°C) for at least 30 minutes, which most home compost piles do not. Throw diseased material in the trash or burn it if local regulations allow.
Soil preparation between crops
Before planting anything new, loosen the soil and remove any remaining tomato roots and debris. Add 1 to 2 inches of compost to replenish organic matter and nutrients. If you are planting legumes, you do not need to add nitrogen fertilizer, but other crops benefit from a balanced fertilizer or compost. Test the soil pH if possible—most vegetables prefer 6.0 to 7.0, and tomatoes leave soil in that range, so you usually do not need to adjust it.
If the tomato bed is in a container or raised bed, you can replace the top 3 to 4 inches of soil with fresh potting mix or compost to reduce disease risk. This is more expensive than amending in-ground beds, but it is the most reliable way to prevent soil-borne disease from affecting the next crop.
Frequently Asked Questions
Can I plant peppers or eggplant after tomatoes?
No. Peppers and eggplant are nightshades like tomatoes and share the same soil diseases. Wait at least two years before planting any nightshade in a bed where tomatoes grew. If your tomatoes had visible disease, wait three years.
How long does it take for soil diseases to die if I do not plant anything?
Most tomato soil diseases survive three to five years in the soil. Leaving the bed empty does not speed this up much. Planting a cover crop or a non-nightshade crop is more practical than waiting, and it improves the soil at the same time.
Can I plant beans right after pulling tomatoes, or do I need to wait?
You can plant beans when ready after removing tomato plants and debris. Remove all plant material, loosen the soil, and plant bean seeds directly. Water until they germinate. Beans do not need a waiting period because they are not susceptible to tomato diseases.
What if I want to plant tomatoes again in the same spot next year?
Plant a legume or cover crop in the bed this year, and wait until next year to plant tomatoes. The legume will add nitrogen, and the one-year break reduces (but does not eliminate) soil disease risk. If your tomatoes had disease this year, wait two full years before planting tomatoes again in that spot.
Do I need to add fertilizer if I plant beans after tomatoes?
No. Beans fix their own nitrogen, so they do not need nitrogen fertilizer. Loosen the soil and add compost if it is very depleted, but beans will grow in poor soil better than most vegetables. Do not add high-nitrogen fertilizer, because it will reduce the bean plants' ability to fix nitrogen.