Tarragon is the classic French herb for chicken, fish and sauces, and in Zone 9 it is a perennial that comes back year after year — as long as you grow the right kind. True French tarragon does not grow reliably from seed, so buy a plant: it is the only way to be sure of the flavour.
Russian tarragon can be grown from seed, but it is coarser and far milder. If you want the real aniseed flavour, a nursery plant of French tarragon is worth every penny, and in Zone 9 it will reward you for years.
Zone 9 at a glance
USDA Zone 9 covers the warmest parts of the southern United States, including much of Florida, southern Texas, southern Louisiana, southern Arizona and coastal California. Winters are mild, with average winter lows of 20 to 30°F, and the growing season runs nearly all year.
The average last spring frost in Zone 9 is Jan 30–Feb 15, and the average first autumn frost is Dec 1–15. These are USDA zone averages drawn from NOAA frost records, not exact dates for any one garden — always check your local extension service and the forecast before planting tender crops outside.
| Detail | Zone 9 guidance |
|---|---|
| Average winter low | 20 to 30°F |
| Average last spring frost | Jan 30–Feb 15 (average/range) |
| Average first autumn frost | Dec 1–15 (average/range) |
| 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 9
Plant tarragon in Zone 9 in spring, from February through April, or in autumn, from October through November, so roots can establish in mild weather. Plants mature in 60–90 days to a first harvest, and seed germinates in 10–14 days — but remember that seed-grown plants are Russian tarragon, not French. The average last spring frost is Jan 30–Feb 15 and the average first autumn frost is Dec 1–15 — USDA zone averages, not exact dates, so check your local extension service for your own area. Tarragon is hardy and survives Zone 9 winters, though it dies back in the coldest weeks and regrows in spring. In high summer it can struggle in intense heat, so give it afternoon shade and extra water.
Work back from the frost dates rather than from a calendar date: the planting calendar hub gives the Zone 9 picture month by month. The month guides for February in Zone 9 and October in Zone 9 show what else is happening at planting time.
Starting tarragon in Zone 9
Start tarragon from a nursery plant or a division — this is the reliable route to true French tarragon. Divide an established clump in spring or autumn, replanting vigorous outer pieces. If you do start from seed, sow indoors in pots or direct-sow, keeping the soil warm and moist for the 10–14 days it takes to germinate, but expect Russian tarragon — milder and coarser. Harden indoor-started plants off for a week before setting them out, and space plants 18–24 inches apart. Tarragon grows into a bushy plant a couple of feet tall, so give it room and a sheltered spot out of strong wind.
Soil, spacing, sun and water
Tarragon needs full sun — with afternoon shade welcome in high summer — and well-drained soil with a pH of 6.0–7.5. Dig in compost before planting, but avoid over-feeding, which makes soft, less flavoursome growth. A gritty mulch keeps the crown dry. Water needs are low: water young plants until established, then water only in dry spells. Overwatering invites root rot, especially in winter. Feed lightly or not at all — lean soil makes more intensely flavoured leaves.
Companion planting
Good companions for tarragon include tomatoes, peppers, marigolds and cabbage, and tarragon itself is traditionally planted near fruit trees and vegetables. Chives are another perennial herb that shares the Zone 9 bed, and our guide to when to plant chives in Zone 9 shows how to time the two together. Rotate annual crops each year, but tarragon is a perennial — choose its spot with the long term in mind, and divide the clump every three to four years to keep it vigorous. 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, though a healthy plant is rarely troubled. Aphids cluster on young tips — wash them off with water. Slugs nibble young shoots, especially after rain; hand-pick them after dark. Thrips can distort leaves in hot weather. In Zone 9, wet winter soil is a bigger threat than any insect — improve drainage and avoid watering in cold weather.
Harvest and storage
Harvest tarragon 60–90 days after planting, picking sprigs as needed and taking no more than a third of the plant at a time. Pick in the morning, when the oils are strongest, and use leaves fresh for the best flavour — tarragon dries poorly, so freeze chopped leaves in water or oil, or make tarragon vinegar. Cut plants back in late autumn after they die down, and mulch lightly. In Zone 9, expect fresh growth from early spring through autumn.
Frequently asked questions
When should I plant tarragon in Zone 9?
Plant in spring (February–April) or autumn (October–November). Plants mature in 60–90 days. It is a hardy perennial that dies back in winter and regrows in spring.
French or Russian tarragon — which should I grow?
French tarragon, bought as a plant — it has the true aniseed flavour but does not grow true from seed. Russian tarragon from seed is much milder and coarser.
Why is my tarragon dying in winter?
Wet winter soil is the usual cause. Tarragon needs sharp drainage; improve it with grit, use a raised bed, and avoid watering in cold weather.
How do I keep tarragon productive?
Pick regularly, divide the clump every three to four years, and cut it back after it dies down in autumn. Replace old, woody plants with fresh divisions.