Dill is the feathery, anise-scented herb for pickles, fish, potatoes and salads — and one of the quickest herbs to grow, ready in 40–50 days. It is a short-lived annual that bolts in heat, so the plan in Zone 8 is to sow little and often through spring, let a few plants self-seed, and enjoy the volunteers. This guide covers when to plant dill in Zone 8 and how to keep a steady supply.
Zone 8 at a glance
Zone 8 covers parts of the southern United States, the Pacific Northwest coast and parts of California, where average winter lows run 10 to 20°F. The average last spring frost falls Mar 1–15 and the average first autumn frost Nov 15–Dec 1. Those are USDA zone averages drawn from NOAA frost records, not exact dates for any one garden — frost dates vary by microclimate, elevation and year, so always check your local extension service and the forecast before planting. Use the frost date calculator for your own averages, and browse the planting calendar hub for the full Zone 8 year.
When to plant dill in Zone 8
| Step | Timing in Zone 8 |
|---|---|
| First sowing | March to May, direct sown |
| Succession sowings | Every 3 to 4 weeks through spring |
| Autumn sowing | August to September, for autumn leaves |
| Harvest | 40–50 days after sowing, picking leaves as needed |
| Seed harvest | Late summer, when seed heads turn brown |
Dill is hardy and can be sown from March, just after the average last frost of Mar 1–15 — the Zone 8 March guide is the start of the season. Sow little and often through spring, because each plant bolts within weeks in warm weather, and sow again in August to September for an autumn crop. Use the seed spacing calculator to work out dates for your own garden.
How to start dill
Direct sow where it is to grow — dill has a taproot and dislikes transplanting. Sow seed thinly in drills, cover lightly, and keep the seedbed moist until germination in 7–14 days. Thin seedlings to 12–18 inches apart; crowded dill stays spindly. Sow a short row every few weeks rather than a whole bed at once, so there is always a young plant coming on. Let one or two plants go to seed and they will self-sow for next year.
Soil, spacing and sun
Dill wants full sun and light, well-drained soil — it copes with poorer soil than most herbs, preferring a pH of 5.5–6.5. Fork in a little compost but do not over-feed it: rich soil gives lush growth with weak flavour. Space plants 12–18 inches apart, and shelter the bed from strong wind, since tall dill blows over easily.
| Fact | Range |
|---|---|
| Sun | full sun |
| Days to germination | 7–14 |
| Days to maturity | 40–50 |
| Spacing | 12–18 in |
| Soil pH | 5.5–6.5 |
| Sowing method | direct sow |
| Cold tolerance | hardy |
All figures are broad published ranges from standard horticultural references, and they vary by variety, soil and weather. Check your local extension service for advice on your own garden.
Watering and feeding
Water needs are moderate: keep the soil evenly moist while plants are young, then water in dry spells. Drought stress makes dill bolt early, so do not let the bed dry out completely. Mulch to hold moisture, and water at the base to keep the feathery leaves dry.
Companion planting
Tomatoes, peppers, marigolds and cabbage are listed companions, and dill is a genuinely useful neighbour: its flowers attract hoverflies, ladybirds and other beneficial insects that eat aphids. It is traditionally planted with cabbages and lettuce. Keep dill away from fennel — the two cross-pollinate and spoil each other's seed — and do not plant it beside carrots, which share its pests. The companions listed for dill in standard references are tomatoes, peppers, marigolds, cabbage.
Pests and problems
Carrot rust fly, aphids and wireworms are the listed pests, since dill is in the carrot family. Fleece over young plants helps against rust fly, and aphids can be washed off with water. Dill's biggest problem is usually bolting in heat rather than pests, so sow in cool weather and keep the soil moist. The pests most often listed for dill are carrot rust fly, aphids, wireworms. Inspect plants weekly, act early while numbers are small, and encourage natural predators such as ladybirds and hoverflies.
Harvest and storage
Start picking leaves 40–50 days after sowing, snipping the feathery fronds as needed — pick in the morning for the best flavour, and use fresh, since dried dill is a poor substitute. If you want seed, let a plant flower and wait until the seed heads turn brown, then cut them into a paper bag to finish drying. Dill seed is a spice in its own right and flavours pickles. Leave a few plants to self-seed and you will have dill again next year without sowing.
Frequently asked questions
When should I plant dill in Zone 8?
Direct sow from March to May, with successional sowings every 3 to 4 weeks, and again in August to September. It is hardy and can be sown just after the average last frost of Mar 1–15.
Why does my dill bolt so quickly?
Heat and drought trigger bolting. Sow in cool weather, keep the soil moist and mulched, and sow little and often so there is always a young plant. Once it bolts, let it set seed — dill seed is useful too.
Can I transplant dill?
It is best not to — dill has a taproot and resents moving. Always sow direct where it is to grow, and thin the seedlings instead of moving them.
Should I plant dill near fennel?
No — dill and fennel cross-pollinate, and the seed of both will be poor. Keep them in separate parts of the garden, and do not save seed from plants grown close together.
For the full year, browse the planting calendar hub. Compare with Dill in Zone 7, and see also Fennel in Zone 8.