Yes, dill grows well alongside tomatoes in the same garden bed
Dill and tomatoes are companion plants — they support each other's growth when planted near one another. Dill attracts beneficial insects like parasitic wasps and hoverflies that prey on common tomato pests such as hornworms and aphids. At the same time, tomatoes do not compete heavily with dill for nutrients or water, and dill's feathery foliage does not shade the tomato plant's lower leaves where disease spreads most easily.
The two plants have different root depths, which also helps: tomato roots go deep into the soil, while dill roots stay shallow. This means they are not fighting for the same resources underground. You can plant dill seeds directly in the soil around tomato transplants, or start dill indoors and transplant it at the same time as your tomatoes.
Key Takeaways
- Dill attracts parasitic wasps and hoverflies that hunt tomato pests like hornworms and aphids, reducing the need for pesticides.
- Plant dill 12 to 18 inches away from the tomato stem to give both plants room to grow without crowding.
- Dill reaches maturity in 35 to 50 days from seed, so you can harvest leaves while your tomatoes are still flowering and fruiting.
- Dill bolts (goes to seed) quickly in hot weather, so plant it early in the season or in a spot with afternoon shade in very hot climates.
- Avoid planting fennel near tomatoes — it inhibits tomato growth — but dill and fennel are different plants and will not cause the same problem.
Spacing and placement in the garden bed
Plant dill at least 12 to 18 inches away from the tomato stem. Dill grows 24 to 36 inches tall depending on the variety, and its wispy leaves need air circulation to stay healthy. If you crowd it too close to the tomato plant, both plants will compete for light and air movement, and moisture will linger on the leaves — a condition that encourages fungal disease.
Position dill on the north or east side of the tomato plant if possible. This placement lets dill receive morning sun without blocking afternoon light from reaching the tomato's fruit-bearing branches. In very hot climates (above 85°F regularly), afternoon shade from the tomato plant actually helps dill stay cooler and delays bolting.
If you are growing tomatoes in containers, you can plant dill in a separate pot placed nearby. A 6-inch pot holds one mature dill plant comfortably. Keep the pots at least 12 inches apart so air can flow between them.
When to plant dill with tomatoes
Plant dill at the same time as your tomato transplants, or up to two weeks after. Dill germinates in 7 to 10 days at soil temperatures between 60°F and 70°F. If you are starting dill from seed directly in the garden, sow it after the last frost date has passed and the soil has warmed to at least 50°F.
In spring plantings, sow dill seeds early — as soon as soil is workable — so the plants mature before peak summer heat arrives. Dill bolts quickly when temperatures stay above 75°F for extended periods. In warm climates, you may get better results planting dill in late summer for a fall harvest alongside your second tomato crop.
If you are transplanting dill seedlings, harden them off over 7 to 10 days before moving them to the garden. This means gradually exposing them to outdoor conditions — start with 2 to 3 hours in a sheltered spot and add an hour or two each day until they spend a full day outside.
Watering and feeding dill near tomatoes
Dill and tomatoes have similar water needs — both prefer soil that is moist but not waterlogged. Water deeply at the base of both plants two to three times per week, depending on rainfall and heat. Avoid wetting the foliage, which can promote fungal disease on both plants.
Dill does not need heavy feeding. If you amended your garden bed with compost before planting, dill will thrive without additional fertilizer. Tomatoes are heavier feeders and may need a balanced fertilizer every two to three weeks once they start flowering. explore fertilizer only to the tomato plant — dill will benefit from the nutrient runoff without needing its own dose.
Mulch around both plants with 2 to 3 inches of straw or shredded leaves. Mulch keeps soil moisture consistent, prevents soil from splashing onto leaves during watering, and keeps the soil cooler — all of which reduce disease pressure and help dill stay from bolting too quickly.
Harvesting dill while tomatoes grow
Dill leaves are ready to harvest 35 to 50 days after planting. Begin pinching off the top leaves once the plant has at least four sets of true leaves. Pinching encourages bushier growth and delays bolting. You can harvest leaves continuously throughout the season — take no more than one-third of the plant at a time so it can keep producing.
If you want dill seeds for cooking or replanting, stop harvesting leaves about three weeks before the end of the growing season. Let the plant bolt and produce its umbrella-shaped flower clusters. Once the flowers fade and the seeds turn brown (usually 60 to 70 days after planting), cut the seed heads and hang them upside down in a paper bag to dry. The seeds will fall into the bag as they dry.
Harvest dill in the morning after the dew dries but before the heat of the day. Leaves are most flavorful and aromatic at this time. Fresh dill keeps in the refrigerator for up to two weeks in a plastic bag, or you can dry it by hanging bundles upside down in a warm, dark place for 7 to 10 days.
Common mistakes when planting dill with tomatoes
The most common error is planting dill too close to the tomato stem. Crowding reduces air circulation and creates a humid microclimate where both fungal disease and pests thrive. Maintain that 12 to 18 inch spacing even though it seems like wasted garden space — the pest control dill provides is worth the room it takes up.
Another mistake is confusing dill with fennel. Fennel produces a bulb at the base and releases compounds that inhibit tomato growth. Dill does not form a bulb and does not have this allelopathic effect. If you want a bulbing herb near tomatoes, choose something else — fennel is not a good companion for tomatoes, but dill is.
Overwatering is also common. Dill prefers soil that dries out slightly between waterings. Soggy soil causes root rot and attracts fungal disease. Let the top inch of soil dry out before watering again. If your region gets heavy rain, you may not need to water at all during wet weeks.
Other herbs that pair well with dill and tomatoes
Basil is the classic tomato companion and works well alongside dill. Plant basil 12 inches away from the tomato stem on the opposite side from the dill. Basil repels flies and mosquitoes while also improving tomato flavor. Parsley, chives, and oregano also grow well near tomatoes and do not compete with dill.
Avoid planting mint near tomatoes or dill — mint spreads aggressively and will overtake both plants. Grow mint in a separate container or a contained bed. Similarly, keep fennel, kochia, and cabbage away from tomatoes, as these plants release compounds that slow tomato growth.
Frequently Asked Questions
Will dill attract pests to my tomatoes instead of repelling them?
No. Dill attracts beneficial insects — parasitic wasps, hoverflies, and ladybugs — that hunt tomato pests. These beneficial insects feed on hornworms, aphids, whiteflies, and spider mites. Dill does not attract the pests themselves; it attracts the predators that eat them.
Can I plant dill seeds directly in the garden bed with tomato transplants?
Yes. Sow dill seeds 12 to 18 inches away from the tomato stem after the soil has warmed to at least 50°F. Seeds will germinate in 7 to 10 days. You can also start dill indoors 4 to 6 weeks before your last frost date and transplant seedlings at the same time as tomatoes.
What should I do if my dill bolts before I finish harvesting leaves?
Let it bolt. Once dill flowers, the leaves become bitter and less flavorful, but the seeds are valuable for cooking and replanting. Harvest the seed heads when they turn brown, dry them in a paper bag, and store the seeds in an airtight container for up to three years.
Does dill need full sun like tomatoes do?
Dill prefers full sun (six to eight hours daily) but tolerates partial shade better than tomatoes. In very hot climates, afternoon shade from the tomato plant can actually help dill stay cooler and delay bolting, which extends the leaf harvest season.
Can I grow dill in a container next to a container tomato plant?
Yes. Use a 6-inch pot with drainage holes for dill and keep it at least 12 inches away from the tomato container. Water both containers separately — dill prefers slightly drier soil than tomatoes, so you may water the tomato more frequently. Make sure both pots receive at least six hours of direct sun daily.