Aqua
Vigorous, dark green, very peppery. Excellent disease resistance. The benchmark named variety for garden use.
Peppery Water Lover
Watercress
Nasturtium officinale
Open the full interactive watercress guide →
⚡ Quick start
- Sow on the surface of moist compost — do not cover seeds
- Never let the growing medium dry out at any stage
- Choose the lowest, dampest spot in your plot
- Or grow in containers standing permanently in a tray of water
- Harvest by cutting stems, not pulling — plants regrow repeatedly
🌱 SowMar–Sep (modules, direct or container)
🌾 HarvestMay–Nov
☀ PositionFull sun or part shade, moist/wet soil
📐 Spacing15cm
DifficultyModerate
⚡ Quick facts
- Difficulty
- Easy–Moderate
- Crop type
- Hardy Perennial (usually grown as annual)
- Position
- Full Sun or Part Shade
- Soil
- Moist to Wet, Fertile Loam
- Container friendly
- Yes — containers standing in water trays
- Greenhouse recommended
- For year-round supply
- Outdoor suitable
- Yes — all UK with adequate moisture
- Frost hardy
- Yes — withstands moderate frost; evergreen in mild winters
01 About
Watercress is one of Britain's oldest cultivated salad plants and one of the most nutritionally dense vegetables in existence. Rich in iron, calcium, vitamins C and K, and powerful antioxidants, it has been eaten medicinally and culinarily for centuries. Its peppery, slightly bitter flavour is superb in salads, soups, sandwiches, and sauces. It naturally grows in fast-flowing chalk streams, but with attentive watering it can be grown successfully in garden beds, containers, and even on windowsills.
02 What to Grow
Watercress divides into two groups: true watercress (Nasturtium officinale) and land cress (Barbarea verna). True watercress has the finest flavour but demands consistently wet conditions. Land cress is easier to grow in ordinary well-watered soil with a similar peppery flavour. For garden growing, always seek named variety 'Aqua' over generic seed — it is far more vigorous, disease-resistant, and productive.
03 Varieties
The number of varieties shown for each crop is based on UK consumption data (2025/26) — the more popular the crop, the more variety choices we include.
💧 True Watercress
Nasturtium officinale. Classic peppery flavour, needs consistently moist or wet conditions.
Gloria
Slightly milder than Aqua. Good for salad use. Reliable cropper in moist beds and containers.
Broad-Leaved
Larger leaves than standard types. Bold peppery flavour. Vigorous grower. Good for soups and cooking.
🌱 Land Cress (Alternative)
Barbarea verna. Drier-soil substitute with similar peppery flavour. Easier to grow.
American Land Cress
Barbarea verna. Grows in ordinary moist soil without waterlogging. Peppery, slightly bitter flavour. Excellent winter hardiness.
Upland Cress
Similar to land cress but with a more delicate leaf structure. Good in salad mixes. Tolerates drier conditions than true watercress.
Belle Isle Cress
Heritage variety. Attractive rosette form. Strong, complex peppery flavour. Hardy and easy to grow in the UK climate.
04 Where to Source
Watercress seed is readily available from most online seed companies and larger garden centres. Look for the named variety 'Aqua', which is significantly more vigorous and productive than generic unnamed types. Some supermarket watercress bunches can be rooted in a glass of water and planted out — a reliable shortcut in spring and summer. Land cress (Barbarea verna) is often sold as an alternative and is easier to grow without constant moisture.
🌱 Watercress seeds (named variety)
Specialist online seed companies
🛒 Land cress seeds
Most garden centres and online suppliers. Often sold as ‘American Cress’
🛒 Supermarket rooted cuttings
Root fresh supermarket watercress bunches in a glass of water in spring/summer and plant out
Timing tip: Order seeds in January and February. Popular varieties sell out quickly. Garden centres and markets are a reliable backup from April onwards.
05 Planting Options
🌿 Outdoor Bed
Best results in a permanently moist bed, beside a pond, stream, or at the lowest point of the plot where water collects naturally.
- Incorporate well-rotted compost to improve moisture retention
- Water morning and evening in dry spells
- Mulch around plants to retain soil moisture
- Position beside a water butt or pond for easy watering access
Outdoor Bed — regional timing: Plant out April–September
💧 Container in Water Tray
The most reliable method for most gardens. Grow in a large pot or trough permanently standing in a tray or saucer filled with water.
- Use a deep tray so the container base sits in 2–3cm of water at all times
- Refresh water tray every few days to prevent stagnation
- Top-dress with compost each season
- Excellent on a patio, balcony, or kitchen windowsill
Container in Water Tray — regional timing: Sow or plant year-round on a windowsill; April–October outdoors
🏡 Greenhouse or Cold Frame
Provides year-round cropping in a heated greenhouse and extends the season significantly in a cold frame or unheated greenhouse.
- Grow in large containers in trays of water
- Maintain high humidity — mist paths regularly
- Watch for whitefly under glass in summer
- Harvest regularly to maintain production
Greenhouse or Cold Frame — regional timing: Year-round in heated greenhouse; autumn–spring in cold frame
06 Companion Planting
✅ Grow nearby
🧅 Celery
Both require consistently moist conditions and grow well together without competing. Similar feeding requirements.
🧅 Chives
Mild pest deterrent and tolerates moist soil. Useful companion at the bed edge.
🌱 Land Cress
Not competing — grown alongside as a drier-soil substitute for gaps in the bed where moisture is less reliable.
❌ Keep apart
07 Sowing — How To
💧 Module Sowing (Recommended)
Fill modules with moist compost
Fill module trays with moist multipurpose or seed compost. Firm gently. Pre-wet the compost before sowing — watercress seed is tiny and can wash off dry compost.
Scatter seeds on the surface
Scatter 3–5 seeds per module on the surface. Do not cover — watercress needs light to germinate. Germination is typically 5–10 days at 15–20°C.
Keep constantly moist
Place the tray in a shallow container of water so modules can absorb moisture from below. Never let the surface dry out — even brief drying kills germinating seedlings.
Move to bright light
Once seedlings appear, move to a bright windowsill, greenhouse bench, or cold frame. Good light is essential for strong, compact growth. Leggy seedlings in low light establish poorly.
Thin to 2–3 per module
Once seedlings reach 2cm, thin to the 2–3 strongest per cell. Overcrowding causes thin, weak transplants. Use scissors rather than pulling to avoid disturbing roots.
Plant out when 5–8cm tall
Transplant into permanently moist ground or containers at 15cm spacing after 3–4 weeks. Water in well. Choose the dampest position available or set containers in trays of water.
First harvest at 6–8 weeks
Once plants are growing strongly and reaching 15cm, begin harvesting by cutting stems above a leaf joint. Plants will regrow 2–3 times from a single sowing.
| Region | Sow / plant | Harvest | Notes |
|---|---|---|---|
| Scotland & Far North | Apr–Aug | May–Oct | Sow March in greenhouse; plant out April–May. Harvest June–October. Use containers inside for autumn extension. · Apr–Aug |
| Northern England | Mar–Sep | May–Oct | Sow under cover from March; plant out April. Harvest May–October. Keep well watered through summer. · Mar–Sep |
| Midlands & Wales | Mar–Sep | Apr–Oct | Sow March–April under cover; plant out from April. Continuous cutting May–October. Autumn sowing for winter. · Mar–Sep |
| Ireland & Isle of Man | Mar–Sep | Apr–Oct | Sow March–April; plant out April–May. Harvest May–October. Mild winters allow near year-round harvest. · Mar–Sep |
| South & SE England | Mar–Oct | Apr–Nov | Sow February–March under cover; March–April direct. Harvest April–November. Year-round in mild winters. · Mar–Oct |
| South Coast & SW | Feb–Oct | Mar–Dec | Near year-round growing possible. Harvest almost all year in mild conditions. Best results spring and autumn. · Mar–Oct |
🌿 Direct Sowing
Prepare a moist seedbed
Choose the lowest, dampest part of the plot. Dig over and incorporate moisture-retaining organic matter. Water the bed thoroughly before sowing.
Sow on the surface in shallow drills
Draw a very shallow drill (5mm). Scatter seeds thinly along the drill. Do not cover — just press lightly with a board or the back of a rake to ensure contact with the soil.
Water daily
Keep the seedbed consistently moist. In dry weather this means watering morning and evening. Any drying out at the surface will kill germinating seeds. Germination in 7–14 days.
Thin to 10–15cm
When seedlings reach 3–5cm, thin to 10–15cm apart. Use thinnings in salads. Do not leave plants too congested — good air circulation helps prevent botrytis in wet conditions.
First harvest at 6–8 weeks
Cut stems once plants reach 15cm. Always cut above a leaf node so the plant regrows. Regular harvesting encourages bushy, productive plants.
Mature plant management
Established watercress can spread by stem contact with moist soil. Allow it to sprawl in a dedicated bed or trim edges regularly. In very wet conditions plants become exuberant growers.
08 Using a Propagator
Watercress benefits from module propagation indoors before planting out. Seeds are tiny and need constant moisture to germinate — a propagator helps maintain the humid conditions they require, especially for early sowings in February and March.
Heated propagator
For February–March sowings, a heated propagator at 15–18°C accelerates germination significantly. Keep the base tray filled with a small amount of water so modules stay moist from below. Do not mist heavily from above — tiny seeds wash off easily.
Unheated propagator
An unheated propagator on a warm windowsill is adequate from April onwards when ambient temperatures are sufficient. Watercress germinates freely at 10°C+. Ensure the lid retains moisture but ventilate daily to prevent damping off.
Standard unheated propagator — A lidded seed tray traps warmth and humidity around germinating seeds without electricity. Performance depends entirely on room temperature — best placed on a warm windowsill and used from March onwards. Replace the lid promptly after watering. Remove it completely the moment seedlings emerge to prevent damping off.
Windowsill alternative: A bright south-facing windowsill can substitute from late February. Place a clear polythene bag loosely over the pot during germination. Remove immediately once seedlings appear.
09 Soil Requirements
- pH
- 6.5–7.5
- Best
- Moist loam, Clay loam
- Tolerates
- Sandy loam
- Avoid
- Dry soil, Sandy, Free-draining
💡 Needs consistently moist or wet soil. Thrives beside streams and ponds. In garden beds, water heavily and frequently.
10 Ongoing Care
💧 Watering: The Non-Negotiable
Watercress is unique among salad crops in that it demands continuous moisture at all times — not 'water when dry' but genuinely never dry. In a garden bed, this means watering once or twice daily in dry weather. The best system is to grow in containers standing permanently in a shallow tray of water, refreshed every 2–3 days to prevent stagnation. In a dedicated bed beside a pond or stream, plants will thrive with minimal intervention. Any significant dry spell causes bolting, bitterness, and leaf scorch from which plants rarely recover fully.
🐛 Pest Watch: Flea Beetle & Aphids
Flea beetle creates tiny round holes in leaves and is worst in warm, dry conditions — though even well-watered watercress can be attacked. Cover with fine insect-proof mesh from planting. Aphids can colonise the growing tips in spring and summer; blast off with a strong water jet rather than using insecticide on a food crop harvested so frequently. Under glass, whitefly can be an issue — introduce biological controls (Encarsia formosa) early in the season for glasshouse production.
✂️ Harvesting for Maximum Regrowth
Always harvest by cutting — never pulling. Cut stems to just above a leaf node (junction), leaving at least 5–8cm of stem with leaves remaining. The plant will branch and regrow from the cut point, producing 2–3 further harvests from each plant. Harvest the top 10–15cm of each stem once growth is vigorous. Harvesting the tips also delays bolting by preventing the plant from setting seed. In peak summer, check plants every 2–3 days — growth is rapid.
11 Watch Out For
Warning
Never harvest watercress from wild streams, ditches, or rivers — it can carry liver fluke (Fasciola hepatica), a parasitic flatworm transmitted via water contaminated by livestock. Even clear, fast-flowing water can be infected. Only eat watercress grown in controlled conditions from clean water sources. Home-grown watercress is completely safe. Always wash before eating.
🐛 Insects & pests
- 🐌 Slugs & Snails — Silver slime trails on leaves, soil, and pots — often the first sign before damage is found
- 🐜 Aphids (Blackfly & Greenfly) — Curled, distorted, or stunted growing tips — aphids inject saliva that causes leaf curl to protect them
🍄 Diseases to watch
- 🔵 Downy Mildew — Downy mildew is caused by oomycetes (water moulds) and is completely unrelated to powdery mildew despite the similar name. It thrives in cool, wet, humid conditions and is most damaging in spring and autumn. Each host plant has its own specific downy mildew species. Lettuce downy mildew can destroy an entire bed within days in the right conditions.
- 🩶 Botrytis (Grey Mould) — Botrytis cinerea (grey mould) is the most ubiquitous fungal pathogen in temperate gardens — present in virtually every garden soil and on plant debris. It becomes a disease only when conditions favour it: cool, humid, poorly ventilated environments with damaged or senescent plant tissue. In a greenhouse in autumn it can destroy an entire tomato or grape crop.
Full identification and treatment advice is in the Pests and Diseases sections.
12 Storage & Preserving
💧 Refrigerator — Keep It Fresh
Watercress wilts very quickly once harvested — typically within 24–48 hours at room temperature. Refrigerate immediately in a sealed bag or container with a damp paper towel. It will keep for 2–3 days in the fridge. For best results, stand the stems in a glass of cold water (like cut flowers) in the fridge, covered loosely with a bag. This preserves both freshness and nutritional content significantly better than dry storage.
🍱 Watercress Soup — Cooked & Frozen
Watercress freezes poorly in raw form but makes exceptional soup that freezes excellently. Sauté onion and potato, add stock, simmer until tender, add a large bunch of watercress, blend immediately (to preserve colour), season, and cool rapidly. Freeze in portions for up to 3 months. The classic French watercress soup (potage au cresson) is one of the finest uses of a glut crop. Thaw overnight in the fridge and reheat gently.
🍳 Wilted & Stir-Fried — Immediate Cooking
Slightly past-their-best watercress leaves are ideal for cooking rather than salad. Stir-fry with garlic and a little sesame oil for 60–90 seconds — it wilts dramatically like spinach but retains a beautiful deep green and distinctive peppery flavour. Also excellent added to pasta, risotto, or scrambled eggs at the last moment. The heat mellows the bitterness considerably. Use within the same day for cooked applications.
13 Expert Tips
💡 Root supermarket watercress for free plants
Buy a bunch of fresh watercress from the supermarket (not pre-washed or pre-packaged in bags — whole bunches only). Place the stems in a glass of water on a windowsill. Within 7–10 days in spring and summer, you'll see white roots developing from the cut ends. Once roots are 2–3cm long, pot up or plant directly into a moist bed. This is completely reliable between April and September and gives you established plants instantly for free.
💡 Prevent bolting with tip harvesting
Watercress bolts quickly in hot weather and long days. The trigger is the plant 'deciding' to flower and set seed. Regular tip harvesting — cutting the top 10cm of each stem every 1–2 weeks — removes the dominant growing point and delays this process significantly. In midsummer, also provide light afternoon shade (a net or fleece) and keep watering absolutely consistent. Bolt stems develop a bitter, hollow character — remove them immediately when spotted.
💡 Use the food safety warning as a selling point
The warning about liver fluke from wild watercress is genuine — but it is also a strong argument for growing your own. Home-grown watercress from a clean water supply or container is completely safe and far superior in freshness and flavour to anything in a supermarket. It is one of the crops where growing your own makes the most compelling practical case: safer, fresher, zero food miles, available year-round.