How to Grow Watercress
On this page
Watercress is one of the few vegetables that genuinely wants wet feet, thriving in permanently saturated, poorly drained soil or a container of potting mix stood in a tray of water topped up daily and fully changed every 1–2 days in warm weather; sow it indoors at a steady 8–15°C. Established plants tolerate cold down to about -20°C, and their peppery bite is best in cool weather, fading once temperatures climb above 29.4°C.
The short answer
- Site
- soil pH 6.5–7.5
- Biggest risk
- Watercress root rot
Core growing advice on this page is checked against named horticultural sources — see References.
Watercress (Nasturtium officinale)
10 sources cited · Verified
Quick Facts
At a Glance
Diseases
Pests
Soil & Growing Conditions
Growth Stages
Harvest & Storage
Plan your Watercress planting
Timing for Watercress follows soil temperature and frost, not the calendar date. The Global vegetable planting calendar explains the method. To work out where it fits in your beds, sketch your plot in the free Garden Layout Planner.
Growing Watercress in another region
Sowing dates, frost timing and local advice differ by country. Use the guide for where you garden.
Sources
-
Sow seed on moist compost in spring and plant out young plants once all frost risk has passed; for an earlier start sow from mid-January to the end of March in pots or trays of moist seed compost, in a propagator or warm place covered with a plastic bag, held at a constant 8-15°C. For container culture, fill a 30cm pot with compost, sow or plant watercress, and stand it in a shallow tray of fresh tap water topped up daily and changed completely every 1-2 days in warm weather. Ready in about 4-6 weeks in containers stood in frequently refreshed water. LIVER FLUKE: avoid harvesting watercress from the wild, as plants may harbour liver flukes damaging to human health; any plants growing in water draining from fields where animals, particularly sheep, graze should not be eaten raw, though cooking the leaves destroys the parasite and makes the plant perfectly safe.
-
Mirrors FAO Ecocrop. Fetched and parsed directly for the numeric soil pH range.
These 3 sources are specific to this region. The full list of 10 sources behind this guide (GBIF, Love The Garden, Royal Horticultural Society and others) is in the references of our UK guide to watercress; they describe the plant itself, which is the same wherever it grows.
Frequently Asked Questions
What soil pH does watercress need?
A pH of about 6.5–7.5. That span reflects genuine variation between the authorities we cite rather than a single agreed figure — the References section lists each source's exact range.
What problems affect watercress?
Our data links 2 diseases and 6 pests to this crop. See the sections above for each one and how to manage it.
Plan next season before the problems start
This page gives you the thresholds; the planner turns them into your own calendar. It works from what you can observe and measure in your garden rather than from dates written for somebody else’s latitude.
Get the Global Garden Planner →Instant PDF download · Works in either hemisphere
How this guide is put together
The growing data on this page — sowing windows, pests, diseases, soil and site requirements — comes from named horticultural sources, listed in References below, checked against international horticultural research and extension sources. An automated pipeline assembles that verified data into the page you're reading: it selects which facts to lead with and builds the surrounding prose and layout. It does not invent a date, a source or a number — where a verified value for a field isn't available, the page leaves it out rather than guessing. A person reviews and publishes each page; nothing goes live unverified.
Related Problem Guides
Last verified 2026-09-02
Related guides
More from the same group (leaves & salads):
Where To Go From Here
Take this crop from reading into a written plan for your own beds.
Keep going
Plan the next step
Use the printable SoilCommander planner for your region to turn this guide into sowing dates, bed layouts and weekly garden tasks.