Dill is a fast, feathery annual that gives you two harvests from one plant: delicate fronds for fish, potatoes and pickles, and seeds for pickling spice. It is one of the quickest herbs you can grow, but in Zone 11 it has one firm demand — it wants the coolest months of the year, and it bolts the moment real heat arrives.
Like every crop in the tropics, dill rewards gardeners who work with Zone 11's seasons — the cooler, drier months and the hot, wet months — rather than against them. The planting calendar hub gives the Zone 11 picture month by month, and our guide to when to plant dill in Zone 9 shows how the timing shifts in a cooler zone.
Zone 11 at a glance
USDA Zone 11 covers the warmest, most tropical parts of the United States — Hawaii, southern Florida, Puerto Rico and the warmest coastal pockets. Winters are warm, with average winter lows of 40 to 50°F, and the growing season never really ends.
Zone 11 is frost-free year-round: there is no average last spring frost and no average first autumn frost. That means you plant by heat and by the wet and dry seasons, not by frost dates. These are USDA zone averages, not exact figures for any one garden — always check your local extension service and the forecast before planting.
| Detail | Zone 11 guidance |
|---|---|
| Average winter low | 40 to 50°F |
| Average last spring frost | Frost-free (no frost dates) |
| Average first autumn frost | Frost-free (no frost dates) |
| Days to germination | 7–14 days |
| Days to maturity | 40–50 days |
| Sowing | direct sow |
| Sun | full sun |
| Soil pH | 5.5–6.5 |
| Spacing | 12–18 inches |
| Water needs | moderate |
| Cold tolerance | hardy |
When to plant dill in Zone 11
Sow dill in Zone 11 in the coolest months, roughly November through February, when daytime heat eases and the plant can grow leaves instead of rushing to flower. Dill is a cool-season annual that bolts fast in tropical heat, so treat it as a winter herb here, not a summer one. Sow a small batch every two to three weeks through the cool season for a steady supply. Seeds germinate in 7–14 days and plants mature in 40–50 days. Zone 11 is frost-free, so there is no last frost date to count back from — sow by the cool season, and check your local extension service for the best local window.
Starting dill in Zone 11
Dill is direct-sown: it dislikes transplanting because of its long taproot, so sow seed where it is to grow. Sow seed about a quarter-inch deep in rows or scattered through a bed, thin seedlings to 12–18 inches apart, and keep the soil evenly moist until they are up in 7–14 days. Dill self-seeds freely, so let one plant go to seed at the end of the cool season and you will often find volunteers next winter. Avoid starting dill indoors unless you must — disturbed roots set plants back badly.
Soil, spacing, sun and water
Dill needs full sun and light, well-drained soil with a pH of 5.5–6.5. In Zone 11, rich soil is not required, but drainage is: heavy rain on compacted soil rots young plants. Work compost into the top few inches, and in a wet winter a raised bed helps. Water needs are moderate — keep the soil evenly moist while plants are young, then water in dry spells, but never waterlog the bed. Dill grows tall and thin, up to three feet, so shelter it from strong wind or grow it among sturdier plants.
Companion planting
Good companions for dill include tomatoes, peppers, marigolds and cabbage. Dill is a classic partner for tomatoes and cabbages, and its umbrella flowers attract beneficial insects that eat aphids. Chives grow on the same cool-season schedule, so the two share a winter herb bed well — see our guide to when to plant chives in Zone 11. Keep dill away from carrots, its close relative, since the two can cross and weaken each other. The companion planting finder can suggest combinations for your whole bed.
Pests and problems
The common pests to watch for with dill are carrot rust fly, aphids and wireworms. Aphids cluster on soft tips and flower heads — wash them off with water or let the ladybirds that dill attracts do the work. Carrot rust fly is a risk where carrots grow nearby, so keep dill and carrots apart. In Zone 11, slugs can nibble young seedlings in wet weather; protect them with a dry, gritty mulch and by watering in the morning. Dill is otherwise a tough, low-fuss plant, and most problems come from heat, not pests.
Harvest and storage
Harvest dill 40–50 days after sowing. Pick fronds as needed, snipping the outer stems first and never taking more than a third of the plant at once, so it keeps growing. For seed, let flower heads mature until the seeds turn brown, then cut the whole head into a paper bag and shake the seeds loose. Fresh dill does not dry as well as other herbs — freeze chopped fronds in ice-cube trays instead, or use it fresh within a few days. Once dill bolts in the heat, the leaves turn bitter, so harvest heavily before the flower stalk shoots up.
Frequently asked questions
When should I plant dill in Zone 11?
Sow in the coolest months, roughly November through February. Dill bolts fast in tropical heat, so treat it as a winter herb. Seeds germinate in 7–14 days and plants mature in 40–50 days.
Why did my dill bolt so quickly?
Heat. Dill is a cool-season annual, and warm Zone 11 days push it to flower. Sow in the coolest months, give it afternoon shade if you can, and sow little and often.
Can I grow dill in summer in Zone 11?
Not well. Summer heat and humidity make dill bolt within weeks and the leaves turn bitter. Save dill for the cool season and grow heat-lovers like lemongrass in summer instead.
Does dill come back every year?
Dill is an annual, but it self-seeds freely. Let one plant go to seed at the end of the cool season and volunteers often appear the following winter.