Yes, you can grow these two crops in the same bed, and they make easy neighbors.
You can plant tomatoes and eggplant together as long as you give each plant 24 to 36 inches of space, keep the taller tomatoes on the north side, and move the whole bed to a new spot every 3 to 4 years.
The catch is that tomatoes and eggplant are close cousins. They like the same sun, soil, and summer heat, and they share many of the same pests and soil diseases. Plan the bed with that in mind and you’ll get a strong harvest from both.
Can Tomatoes and Eggplant Grow Side by Side?
Tomatoes and eggplant grow well side by side when each plant has enough room and the leaves stay dry and airy. Trouble comes from crowding and from disease buildup in tired soil, so some gardens do better with the two crops split up.
Short on yard space? You can also grow tomatoes on a balcony in large containers with the right variety.
The Short Answer: Yes, with Room and Airflow
Growing tomatoes and eggplants together works because they want the same care at the same time of year. You can water, feed, and mulch one bed on one schedule.
In companion planting terms, they’re a “similar needs” pair. Neither crop repels the other’s pests, so the benefit comes from easy care and smart use of space.
Here’s what I’d insist on before you plant them in one bed:
- Room to grow: 24 to 36 inches between a tomato and an eggplant.
- Airflow: stake or cage tomatoes and prune extra suckers so leaves dry fast after rain.
- Clean soil: a spot where no tomatoes, peppers, eggplant, or potatoes grew in the last 3 years.
- Sun for both: tall tomatoes on the north side so they don’t shade the eggplant.
When Separate Beds May Be the Better Choice
I’d split them up if your garden had Verticillium wilt or early blight in the past few seasons. Putting both crops in that soil gives the disease two hosts in one place.
Separate beds also make sense if flea beetles hammer your eggplant every spring. Those beetles chew both crops, and a solid row of nightshades lets them hop from plant to plant.
Small yards are the other case. If your only sunny bed is 4 feet wide and you want three big indeterminate tomatoes, there’s no room left for eggplant without crowding. In that spot, I’d grow the eggplant in a pot nearby.
Why Do These Crops Have Similar Growing Needs?
Tomatoes and eggplant both belong to the nightshade family, so they share a love of heat, full sun, and rich, loose soil. That family tie makes them easy to care for together and also means they share problems.
What Their Shared Family Means for Gardeners
Both plants are members of Solanaceae, the nightshade family, along with peppers and potatoes. Crops in the same family attract the same insects and diseases and pull similar nutrients from the soil.
For you, that means two things. Care is simple because one plan fits both plants. Risk adds up because a problem on one plant can spread to its neighbor.
One more family trait: the leaves and stems contain glycoalkaloids such as solanine. Keep dogs and cats from chewing on either plant.
Sun, Soil, and Warmth They Both Need
Both crops need full sun, which means at least 6 to 8 hours of direct light a day. More is better for fruit, and eggplant sulks in partial shade.
They also want well-drained soil rich in organic matter, with a pH between 6.0 and 7.0. Heavy clay that stays soggy invites root rot, so work in compost or grow in a raised bed if your soil drains slowly.
Both are heavy feeders and warm-season crops. Cold soil stalls their roots, and nights below 50°F slow growth and flowering, especially for eggplant.
When Should You Transplant Each Crop?
Tomatoes go into the garden about 2 weeks after your last frost, while eggplant usually waits another week or two for warmer nights. Plant them on separate days and both will settle in faster.
Plant Tomatoes After Frost and Wait for Warmer Eggplant Nights
Tomatoes are ready once the frost danger has passed and the soil hits 55 to 60°F. Nights should stay near 50°F or warmer.
Eggplant is fussier about cold. I’d hold it until 2 to 3 weeks after the last frost, once nights stay above 55°F and soil is at least 60°F.
Soil at 65 to 70°F is even better. My guide to the best time to plant eggplant goes deeper on this.
If you start your own plants, sow both indoors 8 to 10 weeks before transplant day. Eggplant seed sprouts best at 75 to 85°F, and a heat mat helps it come up in 7 to 14 days.
Harden off both crops for a week or two before planting. Start with an hour of shade outdoors and add sun and time each day.
Adjust Timing to Your Local Growing Season
Your planting dates shift a lot across the US. Use this table as a starting point, then check your local frost date.
| Region | Tomato transplant | Eggplant transplant |
|---|---|---|
| Southeast, Gulf Coast | Mid-March to April | April |
| Southwest (low desert) | February to March | March to April |
| Midwest | Mid-May | Late May to early June |
| Northeast | Mid- to late May | Early June |
| Pacific Northwest | Late May | June |
In the hot Southeast and Southwest, early planting matters because fruit set slows when days top 90°F. In short-season northern areas, choose eggplant varieties that ripen in 60 to 70 days, and black plastic mulch helps warm the soil.
How Far Apart Should You Space and Stake Them?
Set tomatoes and eggplant 24 to 36 inches apart, with rows 30 to 36 inches apart, and put the tomatoes north of the eggplant. That spacing cuts root competition and keeps both crops in full sun.
Allow Room for Mature Plants and Airflow
Eggplant planted with other eggplant can go 18 to 24 inches apart, and dwarf types closer. You’ll find more detail on how far apart to plant eggplant by variety.
Tomatoes need more room, so the gap between a tomato and an eggplant should lean toward the wide end:
- Determinate (bush) tomato next to eggplant: about 24 inches.
- Staked indeterminate tomato next to eggplant: 24 to 30 inches.
- Caged or sprawling indeterminate tomato: 30 to 36 inches.
Stake or cage every tomato at planting time so you don’t stab roots later. Eggplant benefits from a short stake or small cage too, since a plant loaded with fruit can tip over.
On staked indeterminate tomatoes, pinch off most suckers every 7 to 10 days. That keeps the plant narrow and lets air move through to the eggplant.
Keep Taller Tomatoes North of Eggplant
Indeterminate tomatoes reach 6 to 8 feet, while most eggplant tops out at 2 to 4 feet. If the tomatoes sit on the south side, they’ll shade the eggplant for much of the afternoon.
Run your tomato row along the north edge of the bed and your eggplant row along the south edge. In the US, the sun tracks across the southern sky, so this layout gives both crops full sun.
If your bed runs north to south, put tomatoes at the north end and eggplant at the south end.
How Should You Water and Feed Both Plants?
Water both crops deeply and evenly at the soil line, and feed them with compost plus modest side-dressings once fruit starts. The main mistake I see is too much nitrogen, which grows big leaves and few fruits.
Water Deeply Without Wetting the Leaves
Aim for 1 to 2 inches of water a week, including rain. Give it in one or two deep soakings so roots grow down, then check that the top inch or two of soil has dried before you water again.
Use a soaker hose or drip line, or water by hand at the base. Wet leaves in the evening are an open door for blight and other fungal diseases.
Eggplant shows thirst fast, with drooping leaves on hot afternoons. My post on how often to water eggplant covers adjusting for heat waves and sandy soil.
Mulching makes even watering much easier. Spread 2 to 3 inches of straw, shredded leaves, or grass clippings once the soil has warmed. Mulch holds moisture, keeps soil off the lower leaves, and helps prevent blossom-end rot on tomatoes.
Feed for Fruit Without Overdoing Nitrogen
These heavy feeders do best when you start with good soil. Work 2 to 3 inches of organic compost or a balanced fertilizer into the bed before planting.
Then side-dress both crops when the first fruits set, and again every 3 to 4 weeks. Scratch the fertilizer into the soil a few inches from the stem and water it in.
Pick a balanced or lower-nitrogen product once plants are flowering. Rich, dark leaves with few flowers is the classic sign of too much nitrogen. You can read more on how to fertilize eggplant through the season.
Which Pests and Diseases Can Affect Both Crops?
Flea beetles, aphids, spider mites, and hornworms all feed on tomatoes and eggplant, and both crops catch Verticillium wilt and blights. Early checks and clean habits stop most of these before they spread down the row.
Watch for Beetles, Mites, Aphids, and Hornworms
Each pest leaves its own clues, so walk the bed every few days and look under leaves.
- Flea beetles: tiny black beetles that chew pinholes in young leaves, worst on eggplant in spring. Cover young plants with floating row cover until they flower.
- Colorado potato beetle: striped adults and orange egg clusters on eggplant leaves. Hand-pick into soapy water and crush egg masses.
- Aphids: soft clusters on new growth and leaf undersides. Knock them off with a strong spray of water.
- Spider mites: fine webbing and speckled, dull leaves in hot, dry weather. Spray leaf undersides with water in the morning.
- Tomato hornworms: big green caterpillars that strip tomato leaves overnight.