Parsley is the slowest common herb to germinate — 14–28 days, during which most beginners assume the seed has failed and throw the tray away. It has not. Parsley rewards the patient gardener with months of cutting from a single sowing, and starting it indoors 8–10 weeks before last frost is the way to get usable plants by spring.

It is best started indoors, under cover, and planted out once the weather is right.

Parsley at a glance

Growing factor What this crop needs
Days to germination 14–28
Sowing method both
Days to maturity 70–90
Soil pH 6.0–7.0
Spacing 6–8 inches
Sun full sun
Cold tolerance hardy

When to start Parsley seeds indoors

Start Parsley indoors 8–10 weeks before your last frost. Sow too early and you get leggy, root-bound plants; sow too late and you lose weeks of the season. Start parsley indoors 8–10 weeks before your last frost — the long lead time is because germination alone takes 14–28 days. In Zones 3–5, that means a late-winter sowing under lights; in Zones 6–7 the same timing gives spring plants; in Zones 8–9 parsley grows through autumn, winter and spring; in frost-free Zones 10–13, sow in the cooler months. Soaking seed overnight, or pouring warm water over it before sowing, speeds germination noticeably. Check your local extension service for the best local sowing dates.

Zones 3–5: count back 8–10 weeks from your last frost and sow under lights. Zones 6–7: the same lead time. Zones 8–9: the window opens earlier, and autumn sowing is often possible. Zones 10–13 are frost-free, so sow in the cooler months and let heat set the calendar. Use the frost-date calculator and the seed-starting calculator for your dates, and check your local extension service when in doubt.

What you need

You do not need much: fine, sterile seed-starting mix (not garden soil), cell trays or small pots, a tray to catch water, a spray bottle or fine watering can, labels and a marker, and a clear lid or cling film to hold humidity until germination. A grow light is the one item that transforms results — a sunny windowsill can work, but lights give stocky seedlings instead of leggy ones. The grow-light calculator helps size a light for your setup, and the seed-spacing calculator shows how many plants fit your beds at 6–8-inch spacing. Check old packets with the seed-viability checker.

Step by step: starting Parsley seeds indoors

Parsley can be direct-sown or started indoors — both work. Indoor starting wins when you want an earlier crop, even germination, or protection from slugs and cold soil.

  1. Fill your containers. Use cell trays, small pots or soil blocks of fine, sterile seed-starting mix — not garden soil, which is too heavy and can carry damping-off fungi. Dampen the mix before sowing.
  2. Sow at the right depth. Sow seed ¼ inch deep. Parsley germinates in 14–28 days, and depth matters — too deep and seed rots before it emerges.
  3. Label everything. Write the variety and date on every tray. In three weeks, when the trays look identical, you will be glad you did.
  4. Cover and keep moist. Cover with a clear lid or cling film to hold humidity. Ventilate daily once sprouts appear, and remove the cover within a day or two.
  5. Give light immediately. The moment seedlings emerge, move them under a grow light 2–4 inches above, or to the sunniest windowsill. Seedlings left in dim light go leggy within days.
  6. Thin to one per cell. Snip weaker seedlings at soil level rather than pulling them, which disturbs the keeper's roots. Final spacing outdoors is 6–8 inches.
  7. Feed lightly. Once true leaves appear, feed at quarter-strength once a week. Seed compost has almost no nutrients, and hungry seedlings turn yellow and stall.

You can also direct sow Parsley once soil is workable. Check old packets with the seed-viability checker.

Light for seedlings

Light separates stocky seedlings from leggy ones. Give Parsley seedlings 14–16 hours of light a day, with the source just 2–4 inches above the plants — raise it as they grow. A south-facing windowsill can work in spring, but turn trays daily or seedlings lean towards the glass, and on cloudy weeks even a good window is not enough. Our sunlight calculator tells you how much direct sun a spot gets, and the grow-light calculator helps size a light. If seedlings stretch, the light is not close or bright enough.

Watering seedlings

Seedlings want steady moisture, not wet feet. Water from below where possible — stand the tray in a shallow dish for ten minutes and let the compost wick it up — because overhead watering knocks tiny seedlings flat and keeps stems wet, which invites damping off. Check trays daily, since seed compost dries fast under lights, and Parsley has moderate water needs — keep the compost evenly moist but never soggy. Mist the surface lightly after sowing until germination, then switch to bottom watering. As transplanting approaches, let compost dry slightly more between waterings to toughen seedlings up.

Hardening off

Hardening off is the week that decides whether seedlings thrive or sulk. Over 7–10 days before transplanting, put trays outside for a few hours a day in a sheltered spot, increasing time, sun and wind exposure each day, and bring them back in at night. Start with shade and still air; end with a full day outside if temperatures allow. Seedlings that go straight from a warm room to open ground get sunscald, windburn or a cold check that sets them back for weeks. Parsley is hardy — it tolerates light frost, so it can go outside earlier than tender crops. Do not rush this step, and bring trays in if frost threatens.

Transplanting outdoors

Transplant on a cloudy day or in the evening, when the sun will not immediately stress seedlings. Water the trays an hour before, dig holes at the final spacing of 6–8 inches, and set each seedling at the same depth it was growing. Firm soil gently around the roots, water each plant in well, and mulch around (not against) the stems. Good companions for Parsley include tomatoes, peppers, marigolds, cabbage. Watch for carrot rust fly, aphids, wireworms in the first weeks — the pest-identifier helper can help name anything you find. Water daily for the first week while roots establish.

Common problems and fixes

Problem Likely cause Fix
No germination after 2 weeks Normal — parsley takes 14–28 days Be patient; soak seed next time and keep compost moist.
Damping off Wet compost, poor airflow Bottom-water and ventilate.
Leggy seedlings Too little light Lights 2–4 inches above, 14–16 hours a day.
Yellowing leaves Cold or hungry compost Warm the growing area; feed lightly once true leaves show.

No germination after 2 weeks

Normal — parsley takes 14–28 days is the usual culprit. Be patient; soak seed next time and keep compost moist. If badly affected, re-sow — a fresh sowing usually overtakes a struggling seedling within two weeks.

Damping off

Wet compost, poor airflow is the usual culprit. Bottom-water and ventilate. If badly affected, re-sow — a fresh sowing usually overtakes a struggling seedling within two weeks.

Leggy seedlings

Too little light is the usual culprit. Lights 2–4 inches above, 14–16 hours a day. If badly affected, re-sow — a fresh sowing usually overtakes a struggling seedling within two weeks.

Frequently asked questions

Why is my parsley seed taking so long to germinate?

It is just slow — 14–28 days is normal for parsley. Soaking seed overnight before sowing speeds it up.

Should I soak parsley seeds before sowing?

Yes, overnight in warm water. It softens the seed coat and can cut a week off germination time.

How long does parsley take to grow?

About 70–90 days to full-size plants, but you can snip leaves once plants are a few inches tall.

Is parsley an annual or perennial?

A biennial — it grows leaves the first year, flowers and sets seed the second. Most gardeners treat it as an annual and re-sow yearly.

Can I direct sow parsley?

Yes, but germination is slow and weed competition is a problem. Indoor-started plants establish much faster.

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