Growing Watercress: A Complete Profile
By Growing Home Greens Team · August 10, 2026
Watercress is the plant upland cress is compared against and named for, a peppery salad green that shares its flavor but is harder to grow, since it needs constantly saturated soil rather than an ordinary garden bed.
It wants water, not just moist soil
Direct-seeding is difficult because of watercress’s high moisture requirements: seed sown about a half inch apart, a quarter inch deep, needs to stay wet to germinate at all, or you can start it indoors instead and keep the starting mix consistently moist. Either way, plants eventually want fertile, humus-rich, well-limed soil around pH 7.0 that never dries out. A pot standing in a saucer of water, with the water refreshed every couple of days, or a spot next to an existing water feature does the job better than a normal row in a vegetable bed.
A genuine perennial, hardy through winter
Unlike most of the greens here, watercress is a true perennial and hardy enough to keep harvesting through winter. Flavor is at its best in cool weather and fades once the plant flowers, so treat a bolting plant as past its prime rather than trying to coax more leaves from it.
Cut it back rather than pulling it
Harvest by cutting plants back to about 4 inches tall, then let them regrow for a second flush, the same cut-and-come-again approach used for many salad greens. Transplants started indoors about 3 weeks before the frost-free date can go outside, spaced 8 inches apart, once the last frost has passed.
Watercress has no well-established companion pairings, and nothing it needs to be kept away from. In the Garden Designer, plan for it near a water feature or in its own constantly-watered container rather than a standard bed.
Sources: Cress: Watercress & Upland Cress: Key Growing Information, Johnny’s Selected Seeds; How to Grow Watercress in Your Garden, Utah State University Extension.
Companion planting guide for Watercress · Find your planting dates
Typically viable in USDA zones 3-10. Not sure your zone? Look it up by ZIP code.
Mature height: 4-10 in
Method: Either: Start indoors for an earlier harvest, or direct-sow outside for less fuss. Either works.
When to plant watercress, by zone
Every zone watercress grows in. Pick your zone in the header and it will be highlighted here. Each zone links to its full page.
| Zone | Start indoors | Sow or plant out | Harvest |
|---|---|---|---|
| 3a & 3b | May 9–May 16 | May 16–May 23 | Jul 5–Jul 12 |
| 4a & 4b | Apr 24–May 1 | May 1–May 8 | Jun 20–Jun 27 |
| 5a & 5b | Apr 19–Apr 26 | Apr 26–May 3 | Jun 15–Jun 22 |
| 6a & 6b | Apr 4–Apr 11 | Apr 11–Apr 18 | May 31–Jun 7 |
| 7a & 7b | Mar 20–Mar 27 | Mar 27–Apr 3 | May 16–May 23 |
| 8a & 8b | Mar 4–Mar 11 | Mar 11–Mar 18 | Apr 30–May 7 |
| 9a & 9b | Jan 25–Feb 1 | Feb 1–Feb 8 | Mar 23–Mar 30 |
| 10a & 10b | Jan 9–Jan 16 | Jan 16–Jan 23 | Mar 7–Mar 14 |
Harvest dates are about 50 days after the sow or plant-out date, not after starting seeds indoors.
See exact start-indoors, direct-sow, and harvest dates for your zone →
How many Watercress plants fit per square foot?
Spacing: 9 per square foot (square-foot-gardening spacing). Mature height: 4-10 in.
Varieties worth considering
- Watercress: Johnny's Selected Seeds describes their straight-species watercress as a gourmet salad and sandwich vegetable with exceptional nutritional value, sold alongside upland cress on the same product page. (source)
Why each variety is listed comes from the source shown next to it. We haven't grown these ourselves yet, so treat this as a research-backed starting point, not a personal endorsement. The buy links are separate from those sources: they go to seed suppliers that sell that exact variety, and we may earn a commission on some of them.
Where to buy watercress seeds
Botanical Interests (each supplier's watercress seeds)
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See it growing
Search YouTube for "growing watercress" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)
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Growing Watercress: The plant upland cress is compared against and named for, harder to grow since it wants constantly saturated soil rather than an ordinary garden bed.
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