Tarragon is the quiet star of French cooking: its anise-scented leaves lift chicken, fish, eggs and sauces like no other herb. It is also one of the fussier herbs in Zone 11, because true French tarragon hates heat and humidity. Grow it in the cool season, in a pot you can shelter, and it will reward you.
Like every crop in the tropics, tarragon 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 tarragon 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 | 10–14 days |
| Days to maturity | 60–90 days |
| Sowing | both |
| Sun | full sun |
| Soil pH | 6.0–7.5 |
| Spacing | 18–24 inches |
| Water needs | low |
| Cold tolerance | hardy |
When to plant tarragon in Zone 11
Plant tarragon in Zone 11 in the cooler months, roughly November through February, so plants can establish before summer heat and humidity. French tarragon is a perennial, but in tropical Zone 11 it often behaves like a short-lived one, fading in the hot, wet summer. Seeds germinate in 10–14 days and plants mature in 60–90 days. Zone 11 is frost-free, so there is no last frost date — plant by the cool season instead, and check your local extension service for the best local window.
Starting tarragon in Zone 11
Start tarragon seed indoors in pots or direct-sow into prepared beds — both work, but with an important catch: seed sold as tarragon is usually Russian tarragon, which is hardier but far less flavoursome than French tarragon. For the real flavour, buy a French tarragon plant or a cutting, since French tarragon rarely sets viable seed. Sow seed a quarter-inch deep, keep it moist for the 10–14 days to germination, and give seedlings strong light. Space plants 18–24 inches apart.
Soil, spacing, sun and water
Tarragon needs full sun and well-drained, even poor soil, with a pH of 6.0–7.5. In Zone 11, drainage matters more than fertility: heavy rain on clay soil rots the roots fast. Dig in coarse grit, and consider a raised bed or a large pot, which lets you move the plant to shelter in the wettest weather. Water needs are low — water young plants until established, then water only in dry spells. Too much water and too much fertiliser both make soft growth with weak flavour.
Companion planting
Good companions for tarragon include tomatoes, peppers, marigolds and cabbage. Tarragon is a classic companion for eggplants and peppers, and its scent is said to deter pests from nearby crops. Marjoram grows on a similar cool-season schedule and shares a winter herb bed well — see our guide to when to plant marjoram in Zone 11. Keep tarragon away from thirsty plants that need regular watering. The companion planting finder can suggest combinations for your whole bed.
Pests and problems
The common pests to watch for with tarragon are aphids, slugs and thrips. Aphids cluster on young tips — wash them off with water. Slugs nibble young plants in wet weather; water in the morning and keep mulch away from the crown. Thrips can scar leaves in hot, dry spells. In Zone 11, root rot from wet soil is a bigger threat than any insect — give tarragon sharp drainage and never let it sit in water.
Harvest and storage
Harvest tarragon 60–90 days after sowing, once plants are established. Pick sprigs as needed, snipping the top few inches, and never take more than a third of the plant at once. The flavour is strongest just before flowering, so harvest heavily then. Tarragon dries poorly — its flavour fades — so freeze chopped leaves in ice-cube trays or preserve them in vinegar instead. Cut plants back in the cool season to keep them bushy, and divide or replace them every two to three years.
Growing tarragon in a pot
A pot is often the best home for French tarragon in Zone 11, because you control the drainage and can move the plant out of the wettest weather. Use a terracotta pot at least 30 centimetres wide, filled with gritty compost, and stand it where it gets morning sun and light afternoon shade. Water only when the top inch of mix is dry, and never let the pot sit in a saucer of water. In the hottest months, move the pot to a breezier spot and cut the plant back by a third to encourage fresh, flavoursome growth.
Frequently asked questions
When should I plant tarragon in Zone 11?
Plant in the cooler months, roughly November through February. Seeds germinate in 10–14 days and plants mature in 60–90 days. In tropical Zone 11 it often behaves as a short-lived perennial.
Why does my tarragon taste weak?
You may have Russian tarragon, grown from seed — it is hardier but far less flavoursome. For real flavour, buy a French tarragon plant or cutting.
Why is my tarragon dying in summer?
Heat and humidity. French tarragon dislikes hot, wet summers in Zone 11. Grow it in the cool season, in a pot with sharp drainage, and shelter it from the wettest weather.
Can I dry tarragon?
Not well — its flavour fades badly when dried. Freeze chopped leaves or preserve sprigs in vinegar instead.