Watercress is a perennial grown for its leaves, ready to start cutting about 55 days after sowing. It's hardy across USDA zones 3 through 11, stands up to deer and grows just as well in a container as in the ground. Its flowers are a modest draw for honeybees and native bees, even though the leaves are the prize. Once it comes in, a single planting keeps producing for a couple of months, so you harvest over time rather than all at once.
Zones
3-11
pH Range
4.5-8.3
Sun
Full Sun
Days to Maturity
55
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What Watercress is
Watercress grows as a perennial and reaches around 6 inches at maturity. It's also deer-resistant and well suited to containers.
How to grow Watercress
Watercress grows in USDA zones 3 through 11 and is ready to harvest about 55 days after planting. Watercress does best in full sun — at least 6 hours of direct sun a day — and soil from pH 4.5 to 8.3, on consistently moist ground. It needs around 900 growing degree days to mature and a growing season of at least 40 frost-free days, which is why climate matters as much as soil.
USDA Zones
3-11
USDA PHZM 2023
Soil pH
4.5 - 8.3
USDA PLANTS Database
Sun
Full Sun
plant_species_v5.csv
Drainage
poorly (saturated >50% of year)
plant_species_v5.csv
Frost Tolerance
42.8°F
plant_species_v5.csv
Days to Maturity
55 days
Watercress; aquatic; needs running cool water or constant moisture.
UMass-Veg; OSU-PNW
GDD Required
900+
plant_species_v5.csv
Mature Height
0.5 ft
plant_species_v5.csv
Frost-Free Days
40+
plant_species_v5.csv
Start the season right
Plant watercress in full sun with at least 6 hours of direct sun, once the soil has warmed and frost risk has passed.
Match the soil
Watercress prefers pH 4.5 to 8.3 (USDA PLANTS Database). A quick soil test from your local Extension lab tells you whether to add lime or sulfur to land in band.
Water steadily
Keep the root zone evenly moist through establishment. Match watering to the plant's drainage preference and your local rainfall.
Harvest at maturity
Watercress is ready about 55 days after sowing (UMass-Veg; OSU-PNW). Cut the outer leaves as you need them — frequent harvest keeps new growth coming.
Good to know
Good news for pet owners — watercress isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Watercress offers low value to bees and other pollinators. (Source: Xerces Society, Pollinator Partnership.)
Where Watercress thrives
On hardiness alone, watercress grows across most of the country — its range (USDA zones 3 through 11) is unusually wide. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
Zones 3–11·Where Watercress growsOpen map →
On USDA hardiness-zone overlap, Watercress can grow in these states:
See if Watercress will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether watercress actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
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Frequently Asked Questions
Can I grow Watercress in my zone?
Watercress grows in USDA hardiness zones 3 through 11 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
How long does Watercress take to grow?
Watercress is ready to harvest about 55 days after planting (UMass-Veg; OSU-PNW). Your local frost dates and soil temperature move that window earlier or later.
When should you plant Watercress?
Most growers plant watercress after the last spring frost, once the soil has warmed, leaving enough of the season for its 40-day frost-free need. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Watercress need?
Watercress needs full sun — a spot that catches at least 6 hours of direct summer sun a day. In more shade it still grows, but usually gives a smaller, later crop. The catch is that a yard rarely gets even light everywhere — a fence, the house, or one tall tree can quietly take those hours. A Growable Ground report reads the real sun-hours across your land, canopy and buildings included, so you can pick the brightest bed before you plant.
What soil does Watercress need?
Watercress prefers soil pH 4.5 to 8.3, on consistently moist ground (USDA PLANTS Database). Your report scores your parcel's actual soil against that using USDA SSURGO data.
Does Watercress attract pollinators?
Yes — watercress's flowers are a modest nectar source for honeybees and native bees (Xerces Society, Pollinator Partnership).
Is Watercress safe for pets?
Watercress is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.