Can I grow watercress at home in the UK?

Yes — the pot-in-saucer method works well for kitchen use. A 20 cm pot of compost stood in a saucer of fresh water, kept topped up daily, gives a useful crop within 6–8 weeks. Don't try to grow watercress in a normal garden bed; without constantly wet roots it sulks and bolts.

Is wild watercress safe to eat?

No — not raw. UK wild watercress may carry liver fluke (Fasciola hepatica), a parasite that can infect humans and cause serious illness. The eggs are laid by infected sheep and cattle and can persist in the stream or surrounding wet ground. Wild watercress should only be eaten well-cooked; even then it's safer to grow your own. Commercially-grown watercress is safe to eat raw.

What's the difference between watercress and land cress?

Watercress (Nasturtium officinale): true aquatic perennial; needs constantly wet roots; classic peppery flavour. Land cress (Barbarea verna, sometimes called American land cress): grows in normal damp soil; similar peppery flavour; much easier in UK gardens. Land cress is a hardy biennial — sow March–September, crop October through to spring. The practical UK substitute for watercress when you don't have running water.

How do I grow watercress from supermarket sprigs?

Stand a bunch of supermarket watercress in a glass of fresh water; change the water daily. Roots form within a week. Once 2–3 cm of roots have grown, plant the rooted sprigs in damp compost in a pot, stand the pot in a saucer of water, treat as for seed-grown. A free start, and the supermarket bunch was someone else's cultivar selection.

When can I pick watercress?

6–8 weeks after sowing (or 2–3 weeks after planting rooted sprigs). Pick the top 5–7 cm of shoots; the plant branches and produces more from each cut. Continuous picking is the rhythm; the more you cut the more it grows. Cut flower stems off as soon as they appear to keep the foliage tender.

Why is my watercress yellowing and tough?

Three usual causes. Roots not wet enough: the saucer dried out. Keep it topped up daily. Too much sun: watercress wilts in strong direct sun; move to light shade. Flowering: the plant is mid-life and trying to set seed; cut the flower stems off and pick more aggressively, or replace with fresh cuttings.

Watercress — Grow

Watercress

Nasturtium officinale

vegetable☀️ part-sun🪴 moist rich📏 small🌡️ RHS H5–H6

About

Grow watercress in a pot stood in a saucer of fresh water, kept topped up daily, in light shade — it's a perennial aquatic herb that wants constantly damp roots and cool conditions. Watercress is hardy (RHS H6) but UK home growers don't usually attempt the running-stream cultivation it really wants. The pot-in-saucer method works well for kitchen use. Sow seed in late spring (March–May) onto compost, keep wet, and pick young shoots within 6–8 weeks. Don't gather wild watercress — UK wild stocks may carry liver fluke (Fasciola hepatica) and should not be eaten raw. Land cress (Barbarea verna) is the soil-grown UK alternative with similar peppery flavour, sown March to September and cropped winter through to spring.

Top tip

Needs constant moisture or running water; harvest lightly but often to keep plants young.

Also known as: Waterkers, Agrião-de-água, Berro de agua, Cresson de fontaine, Rukiew wodna, Watercress, Nasturtium officinale, Brunnenkresse

How to grow watercress

1
Choose your method
Pot in saucer (recommended for UK home use): a 20 cm pot of compost stood in a saucer that's kept topped up with water. Simple, controllable, suits small kitchens. Running water bed: traditional commercial method needing a continuous clean water flow — impractical for most UK gardeners. Land cress (separate species Barbarea verna): similar flavour, grown in damp soil like spinach. The easiest UK alternative.
2
Buy seed or cuttings
Watercress seed is widely available; cuttings from a bunch of supermarket watercress also root readily in water. Land cress (American land cress) seed is sold separately — sometimes labelled winter cress.
3
Sow on damp compost
March to May for outdoor pots; year-round indoors on a kitchen windowsill. Surface sow onto damp peat-free compost; press lightly; mist to keep the surface moist. Germination in 7–14 days.
4
Keep constantly wet
Stand the pot in a saucer that's always full of fresh water. Top up daily in summer; replace the water weekly to keep it fresh. Watercress wants its roots in water; don't let the saucer dry out.
5
Position in light shade
Watercress wilts in strong direct sun and loves cool conditions. Light shade or an east-facing windowsill; outdoors in summer choose a sheltered shady spot.
6
Pick young shoots
From 6–8 weeks after sowing. Pick the top 5–7 cm of growth regularly. The plant branches at each cut and produces more. Don't let it flower (small white flowers) — flavour weakens; cut flower stems off as soon as they appear.
7
Replace plants every 6 months
Watercress in pots exhausts itself after about 6 months. Take cuttings from the best plants (the cut stems root in water in days) and start fresh pots. The parent plant can go on the compost.
8
DON'T eat wild watercress
UK wild watercress may carry liver fluke (Fasciola hepatica), a parasite that can cause serious illness in humans. Never gather and eat wild watercress raw. Commercially-grown watercress from supermarkets is safe; home-grown watercress in containers using mains water is safe.

Common questions

Pest Resilience

4/5 — Good resilience

Few pest problems; whitefly occasionally but generally trouble-free.

Companion Planting

Grows well with

Lettuce Radish Mint

Visual Characteristics

🍳

Culinary

Culinary Use

Salads, sandwiches, soups, garnish, stir-fries, pesto, smoothies

The watercress year in your garden

Dispatching imaginary bots to check your garden out...

What to do now

How to Propagate

🌰Seed

Easy

✂️Cutting

Moderate

Hardiness Zones

H1a (tender)H7 (very hardy)

H1a

H1b

H1c

RHS H5–H6

USDA 6 equivalent

Watercress

Watercress

About

How to grow watercress

Common questions

Pest Resilience

Companion Planting

Visual Characteristics

The watercress year in your garden

How to Propagate

Hardiness Zones

Names in Other Languages(7)