How to grow watercress
Nasturtium officinale · Brassicaceae · Vegetable
When to plant watercress: the short answer
Start seeds indoors about 4 weeks before your last spring frost; plant out about 2 weeks before it; sow outdoors about 3 weeks before the last frost; for a fall crop, sow about 6 weeks before your first fall frost. Seeds germinate in soil from 45 to 70°F, fastest near 60°F.
Cold winters (zone 5): sow Apr 4 – Apr 23, or sow Aug 14 – Aug 31 for a fall crop. Mild winters (zone 9): sow Oct 9 – Oct 26 for fall and winter harvests; the spring window (Jan 25 – Feb 13) closes before the summer heat. Skip the hottest months for watercress. See every zone.
Watercress is a cool-season vegetable in the Brassicaceae family, grown either from a direct sowing or from transplants. It wants full sun, though it tolerates a little afternoon shade in hot regions and plenty of water, especially in hot weather. From sowing to first pick is about 50–60 days. It handles frost well and a light freeze often improves the flavour.
Grower’s note: A true water-lover - grow it in a wide, shallow container kept standing in an inch or two of water (top it up or change it often so it does not stagnate), or in a bog-style bed that never fully dries out. Snip stems above a leaf node for repeat cut-and-come-again harvests. It also roots readily from a bunch of fresh grocery-store watercress stood in a glass of water.
Sowing
Sow about 0.25″ deep, into soil between 45–70°F — germination is quickest near 60°F. Germination takes a week or two (7–14 days). For an early crop, start seed indoors about 4 weeks before your last spring frost and grow it under bright light.
Spacing & layout
Give each plant about 4″ along the row with roughly 12″ between rows. On a square-foot grid that is 9 per square foot. Allow at least 6″ of loose, workable soil for the roots. It grows well in containers at least 6″ deep.
Fitting it to your season
As a cool-season crop, watercress does its best growing in the mild weather of spring and fall and tends to bolt or turn bitter in summer heat. A second sowing in late summer, timed to mature as the weather cools, is usually the better crop of the year — and light frost only sweetens it.
Quick facts
Growth stages: how long watercress takes to grow
From sowing to first harvest takes roughly 50-60 days (7-9 weeks), with seedlings appearing after 7-14 days in soil around 60°F.
When to plant watercress
When to plant watercress by USDA zone
Dates worked out from each zone’s typical frost dates for 2026. Find your zone on the zone map, or pick your state below for dates from its own frost dates. Zones 11 and above are frost-free, so timing there depends on heat and rain instead.
| Zone | Last / first frost | Start indoors | Sow or plant out | Fall or second sowing |
|---|---|---|---|---|
| Zone 3 | May 15 / Sep 15 | Apr 10 – Apr 24 | Apr 19 – May 8 | Jul 25 – Aug 11 |
| Zone 4 | May 10 / Sep 25 | Apr 5 – Apr 19 | Apr 14 – May 3 | Aug 4 – Aug 21 |
| Zone 5 | Apr 30 / Oct 5 | Mar 26 – Apr 9 | Apr 4 – Apr 23 | Aug 14 – Aug 31 |
| Zone 6 | Apr 15 / Oct 15 | Mar 11 – Mar 25 | Mar 20 – Apr 8 | Aug 24 – Sep 10 |
| Zone 7 | Apr 5 / Oct 25 | Mar 1 – Mar 15 | Mar 10 – Mar 29 | Sep 3 – Sep 20 |
| Zone 8 | Mar 20 / Nov 5 | Feb 13 – Feb 27 | Feb 22 – Mar 13 | Sep 14 – Oct 1 |
| Zone 9 | Feb 20 / Nov 30 | Jan 16 – Jan 30 | Jan 25 – Feb 13 | Oct 9 – Oct 26 |
| Zone 10 | Jan 30 / Dec 15 | Dec 26 – Jan 9 | Jan 4 – Jan 23 | Oct 24 – Nov 10 |
Companions
No strong companions recorded.
No strong antagonists recorded.
Common problems
Pests: aphids, flea beetle, snails.
Diseases & disorders: root rot, leaf spot.
Same family (Brassicaceae)
Rotate these so they don’t follow each other in the same bed year to year.
Questions gardeners ask
When should I plant watercress?
Start seeds indoors about 4 weeks before your last spring frost; plant out about 2 weeks before it; sow outdoors about 3 weeks before the last frost; for a fall crop, sow about 6 weeks before your first fall frost. Seeds germinate in soil from 45 to 70°F. The table on this page gives dates for each USDA zone, and the planting calendar gives dates for your own state or ZIP code.
How long does watercress take to grow?
About 50-60 days from sowing to the first harvest. Seeds germinate in 7-14 days, fastest in soil around 60°F.
How much sun does watercress need?
It needs six or more hours of sun for the best growth, though four to six hours in partial shade is enough.
What soil pH does watercress need?
A soil pH between 6.5 and 7.5. Test before adding lime or sulfur - see the soil pH and testing guide.
How far apart should I plant watercress?
Space plants about 4 inches apart in rows 12 inches apart, or 9 per square foot in a square-foot bed. Sow seeds about ¼ inch deep.
Can I grow watercress in a container?
Yes. Use a container at least 6 inches deep with drainage holes and a good potting mix, and water more often than you would in the ground.
Figures are typical home-garden ranges from Cooperative Extension planting guides, cross-checked against multiple state sources. Your variety and conditions will vary.