How to Grow Dill

Dill is one of the most useful herbs in the US kitchen garden — essential for pickles, excellent with fish and potatoes, and a powerhouse for attracting beneficial insects. It also has one important quirk: it bolts quickly in heat, producing seeds instead of leaves. Succession planting is the one technique that makes dill reliably productive through the growing season.

This guide covers direct seeding, harvest, and the practical details that keep dill producing leaves rather than seeds for as long as possible.

Dill varieties for US gardens

Most US gardeners grow two types of dill, used for different purposes:

For leaf (dill weed) harvest: ‘Fernleaf’ and ‘Dukat’ are the best choices. Both are slower to bolt than standard types, extending the leaf harvest window by 1–2 weeks.

For seed harvest (pickling): ‘Bouquet’ and ‘Mammoth’ produce the heaviest seed heads and are the traditional choice for dill pickle production.

When to plant dill

Dill germinates in soil temperatures of 60°F–70°F. It tolerates light frost (28°F–32°F) after germination, making early spring seeding possible.

Spring planting: Sow 2–4 weeks before the last frost date. Dill seedlings emerge quickly (7–10 days) and tolerate the cool temperatures that follow late-season frosts. In most US zones, this means seeding in March–April.

Fall planting: For a second leaf harvest, sow 8–10 weeks before the first fall frost date. Fall-grown dill often produces more flavorful leaves than summer-grown because cool temperatures slow the bolting process. In Zone 6, this means seeding in early August.

In Zones 7–10, summer is too hot for reliable dill leaf production. Plant in early spring and again in late summer — skip midsummer entirely.

Succession planting for continuous harvest

A single dill planting goes from seed to bolt in 8–12 weeks in warm weather. Without succession planting, you have dill for 4–6 weeks and nothing after.

Succession schedule: Sow a new row or small patch every 2–3 weeks from spring planting through mid-summer. By the time the first planting bolts, the second is ready to harvest.

A simple three-succession schedule for Zone 6:

• First sowing: April 1
• Second sowing: April 22
• Third sowing: May 13
• Fall sowing: August 10

This gives leaf harvest from late April through June, a gap in July, and fall leaves in September and October.

How to plant dill

Dill develops a taproot quickly and transplants poorly once it is more than a few inches tall. Direct seeding is strongly preferred.

Planting steps:

1. Choose a full-sun location (6+ hours direct sun). Dill tolerates partial afternoon shade but grows slower and taller.
2. Loosen the top 4–6 inches of soil. Dill does not need rich soil — average, well-draining soil produces better-flavored plants than heavily fertilized beds.
3. Scatter seeds thinly on the soil surface (dill seeds are small and flat). Press them into the surface — do not bury them. Light contact with soil is enough for germination.
4. Water gently. Seeds germinate in 7–14 days at 65°F–70°F.
5. Thin seedlings to 8–12 inches apart once they reach 2–3 inches. Crowded dill is susceptible to powdery mildew and produces weaker plants.

Spacing: 8–12 inches apart in all directions. Tall varieties (‘Mammoth’) may need 12–18 inches to reach full size without falling over.

Soil pH: 5.5–6.5. Dill is one of the least fussy herbs about soil — it grows in rocky, sandy, or clay soil as long as drainage is adequate.

For general herb garden setup and placement, see herb garden for bed layout and site selection guidance.

Growing dill in containers

Container dill works well with the right pot selection:

• Pot depth: Minimum 12 inches. Dill’s taproot grows straight down and a shallow pot stunts the plant and accelerates bolting.
• Pot width: One plant per 10–12 inch pot. For a larger harvest, use a 18-inch pot with 2–3 plants.
• Potting mix: Use a well-draining mix. Avoid heavy, moisture-retaining mixes — dill roots rot in waterlogged containers.
• Watering: Water when the top inch of soil is dry. Container dill dries out faster than in-ground plants.

‘Fernleaf’ is the best container variety — it stays compact (18–24 inches vs. 3–5 feet for standard types) and produces dense, harvestable foliage throughout the season.

Fertilizing dill

Dill grows best in lean conditions. Unlike heavy-feeding vegetables, dill does not benefit from regular fertilizing — overly rich soil produces lush plants that bolt faster and have less concentrated flavor.

At planting: If your soil is very poor (thin, sandy, no organic matter), work in a small amount of compost. A 1-inch layer worked in is sufficient.

Ongoing: No fertilizer needed for most established plantings. If plants yellow despite adequate sun and water, a single application of fish emulsion at half strength can correct deficiency.

Avoid nitrogen-heavy fertilizers entirely — they push dill into vegetative growth that delays seed production but also accelerates the bolt-to-flower transition that ends the leaf harvest.

Harvesting dill leaves (dill weed)

When to harvest: Begin harvesting when plants are 8–10 inches tall and have developed at least 4–5 fronds. Harvest before the plant develops flower heads — leaves become more bitter and less aromatic after flowering begins.

How to harvest: Snip individual fronds (the feathery leaves) with scissors or garden shears. Cut them where the frond meets the main stem. Alternatively, cut the top 3–4 inches of the plant stem — this encourages branching and more side growth.

Harvest frequency: In cool weather, harvest every 7–10 days. In warm weather, harvest every 5–7 days to stay ahead of bolting.

Signs bolting is starting: The central stem elongates rapidly, growing taller than the surrounding foliage. Small yellow flower buds appear at the stem tip. This is the signal to harvest everything you can use — leaves become less flavorful quickly after this point.

Fresh storage: Wrap harvested dill loosely in a damp paper towel and store in the refrigerator in a plastic bag. Use within 5–7 days. For longer storage, freeze fronds whole in labeled bags — they maintain flavor for 3–4 months.

Harvesting dill seeds

For pickling, drying, and saving seed, let plants bolt and go to flower. The umbrella-shaped flower heads (umbels) will form and mature into green seeds, then brown dry seeds.

Timing: Harvest seed heads when seeds turn from green to tan-brown but before they fall naturally. This is typically 2–3 weeks after flowers open.

Method: Cut entire seed heads into a paper bag. Hang the bag in a dry, ventilated location for 1–2 weeks. The seeds will fall to the bottom of the bag. Store in an airtight jar away from heat and light.

See how to dry herbs for complete preservation methods for dill fronds and seeds.

Companion planting with dill

Dill is one of the most beneficial companion plants in the US vegetable garden, primarily because it attracts parasitic wasps and predatory insects that control common pests.

Best companions for dill:

• Brassicas (broccoli, cabbage, kale) — dill attracts parasitic wasps that parasitize cabbage worms, the top brassica pest. See kale companion plants and growing broccoli for full companion planting details.
• Lettuce and leafy greens — dill’s tall growth shades heat-sensitive greens in spring. The beneficial insects dill attracts also protect leafy crops.
• Cucumbers — traditional pairing for flavor (dill pickles). Dill’s umbel flowers attract cucumber beetle predators.
• Tomatoes — beneficial insect habitat near tomatoes reduces aphid pressure.

Poor companions:

• Fennel — fennel and dill cross-pollinate if grown within 10–15 feet of each other. The resulting seeds are hybrids with degraded flavor for both plants. Keep them separated by at least one raised bed length.
• Carrots — some growers report dill inhibiting carrot germination when planted in adjacent rows.

For a broader companion planting reference, see companion planting chart.

Dill pests and problems

Aphids: Clusters of small green or yellow aphids sometimes attack dill, particularly in warm weather. A strong spray of water removes most colonies. Beneficial insects attracted by dill flowers usually control populations naturally.

Hornworms: Tomato and tobacco hornworms occasionally feed on dill. Hand-pick the large green caterpillars. They are harmless to find — just move them away from the garden.

Leaf spotting: Fungal spots on leaves in humid climates indicate cercospora leaf spot. Increase spacing to improve air circulation. Remove badly infected foliage. It rarely kills plants.

Powdery mildew: White powdery coating on leaves in late summer. Caused by low air circulation and crowded planting. Thin plants to improve airflow. Neem oil applied every 7 days reduces spread.

Allowing dill to self-seed

Dill’s most useful characteristic for the established garden: it self-seeds abundantly. If you allow even one or two plants to fully mature their seed heads and drop seeds naturally in fall, you will have volunteer dill seedlings the following spring.

Managing self-seeding:

• Allow: Leave 1–2 seed heads per planting area to mature and drop seeds naturally in place.
• Prevent spread: If volunteers appear where you don’t want them, pull them when small. The taproot at young sizes is easy to remove.
• Harvest before dropping: If you want to control where seeds go, harvest seed heads just before they’re fully dry. The seeds you miss will still provide next year’s volunteers.

Self-seeded dill is often hardier and more vigorous than deliberately planted seed — it sprouts when conditions are precisely right rather than when you decided to plant it.

Dill with basil and other herbs

Dill grows well alongside most annual herbs planted at the same time. Basil and dill are often planted in proximity in US kitchen herb gardens — both need warm weather and full sun, and basil’s compact habit doesn’t compete with dill’s height.

Growing cilantro alongside dill creates a continuous cool-season herb bed in spring — both bolt in heat at similar rates, meaning succession plantings of both can be managed on the same schedule.

Rosemary plant care and dill are poor pairing candidates — rosemary is a woody perennial that requires full sun and excellent drainage, and its permanent placement often clashes with dill’s need for seasonal rotation.

A single established dill self-seeding colony in a dedicated corner of the herb garden provides years of reliable harvests with minimal effort — plant it once, then let it maintain itself with just a little management each spring.