How to Grow Tawa
Wikimedia Commons
Tawa
Nasturtium officinale
vegetableTawa, commonly known as watercress, is a semi-aquatic leafy green vegetable with small, round, peppery-flavored leaves that grow in dense clusters. It thrives in cool, water-rich environments and is prized for its nutrient density and distinctive peppery taste in salads and cooking. This fast-growing plant is traditionally cultivated in shallow water or consistently moist conditions.
When should you plant Tawa in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Tawa timeline · Pittsburgh, PA (Zone 6b)
-
Plant Tawa
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
Harvest Tawa
Around May 17≈ 30 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Tawa dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9, prefers cool climates with consistent moisture
Sign up free to see if Tawa grows in your zone — and get a personalized planting timeline.
Get my Tawa timeline →Growth Stages
Seedling
2-3 weeksTiny seedlings with first true leaves emerging; plants are delicate and require high moisture
Keep soil consistently wet; maintain cool temperatures (60-70°F); protect from direct midday sun; mist regularly if not in water
Vegetative Growth
3-4 weeksRapid leaf development with dense foliage; stems elongate and branch out; characteristic rounded leaves appear
Maintain water level or very moist soil; provide partial shade in hot weather; thin seedlings to prevent crowding; fertilize lightly with balanced fertilizer every 2-3 weeks
Mature Foliage
2-3 weeksPlant reaches full size with abundant peppery leaves ready for harvest; stem nodes may begin to root if touching water
Continue consistent moisture and cool conditions; harvest outer leaves regularly to encourage bushiness; watch for bolting in warm weather
Flowering
1-2 weeksSmall white or pale pink flowers appear in clusters; plant quality declines as energy shifts to reproduction
Harvest heavily before flowering or pinch off flower buds to extend leaf production; if flowering occurs, plant is past peak flavor and texture
Seed Production
2-3 weeksLong, thin seed pods develop; leaves become tougher and less palatable
Plant is no longer suitable for eating; allow to mature fully only if seed saving is desired; otherwise, compost or remove plant
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Use row covers; spray with neem oil; encourage beneficial insects; remove affected leaves
-
Spray with strong water stream; apply insecticidal soap; use neem oil; introduce ladybugs
-
Use fine netting; hand-pick larvae; apply Bacillus thuringiensis (Bt)
-
and
Remove by hand; use copper tape barriers; create beer traps; encourage ground beetles
Uses
Fresh Salads & Garnish
CulinaryWatercress leaves add a peppery, spicy flavor to salads, sandwiches, and garnishes. The tender leaves and stems are eaten raw and provide a crisp texture and distinctive taste that complements mild greens and vegetables. [source]
Cooked Greens & Soups
CulinaryTawa can be lightly cooked in stir-fries, added to soups, or wilted as a side dish. Cooking mellows the peppery flavor while retaining nutritional benefits. [source]
Nutritional & Health Benefits
MedicinalWatercress is extremely nutrient-dense, containing glucosinolates, vitamins A, C, K, and minerals like iron and calcium. Traditionally used in herbal medicine for respiratory health and as a natural diuretic. [source]
Natural Dye & Household Use
HouseholdWatercress has been historically used to create natural green dyes for textiles and fabric coloring. [source]
Aquatic Habitat & Wildlife Support
WildlifeWatercress in natural or semi-natural growing settings provides habitat and food for aquatic insects, amphibians, and birds. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting when plants are 3-4 inches tall, typically 30-50 days after planting. Pinch or cut outer leaves and stems from the top to encourage bushier growth and extended harvest. Harvest in the morning when leaves are crisp and full of moisture. Continue harvesting throughout the growing season; plants prefer cool weather and may bolt or become bitter in hot conditions. Use scissors or pinch by hand to remove 1-2 inches of growth regularly.
Fun Facts
- 🌱 Watercress has been cultivated for over 2,000 years and was valued by ancient Romans for its medicinal properties and peppery flavor.
- 🌱 Watercress is one of the most nutrient-dense vegetables per calorie, containing more vitamin C than oranges and more calcium than milk by weight.
- 🌱 The plant can propagate from stem cuttings placed in water, making it incredibly easy to multiply plants indefinitely without seeds.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Tawa planting timeline
Tell us your zip code and we'll calculate exactly when to start Tawa seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Tawa timeline →