How to Grow Kew Green
Wikimedia Commons
Kew Green
Rumex acetosa var. 'Kew Green'
herbKew Green is a cultivated variety of garden sorrel selected for its tender, vibrant green leaves and mild, lemony flavor. It produces elongated arrow-shaped leaves on upright stems and is prized by chefs and gardeners for fresh culinary use. This perennial herb is more refined than wild sorrel, with improved leaf quality and extended harvesting seasons.
When should you plant Kew Green 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 Kew Green timeline · Pittsburgh, PA (Zone 6b)
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Plant Kew Green
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Kew Green
Around May 27≈ 40 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Kew Green dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9; prefers cooler climates but tolerates heat with afternoon shade
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Seed Germination
2-3 weeksSeeds sprout and develop first true leaves. Seedlings are delicate with thin stems and small rounded cotyledons.
Keep soil consistently moist but not waterlogged. Provide bright light to prevent leggy growth. Thin seedlings to prevent overcrowding. Germination occurs in 7-14 days at 60-70°F.
Vegetative Growth
4-8 weeksPlant develops multiple arrow-shaped leaves on sturdy upright stems. Foliage deepens in color and becomes more robust. Root system expands.
Harvest outer leaves regularly to encourage bushier growth and delay flowering. Remove any flower stalks that appear to extend the leaf-harvesting period. Keep soil consistently moist. Apply balanced fertilizer monthly or use compost side-dressing.
Flowering
2-4 weeks (if allowed to flower)Tall flower stalks emerge from the center of the plant bearing small reddish or greenish flowers in clusters. Leaves become tougher and more acidic as flowering progresses.
Pinch off flower stalks immediately to maintain tender leaf production and prevent self-seeding. Remove entire flowering stems at the base. Once flowering begins, leaf quality declines significantly.
Mature Perennial
Ongoing (years 2+)Established plant with extensive root system. Can persist for 3-5+ years, producing leaves continuously if managed properly.
Divide plants every 2-3 years in early spring or fall to rejuvenate. Cut back to 2-3 inches in fall after frost. Apply mulch in winter for cold protection. Remove old, large leaves to encourage tender new growth.
Senescence/Dormancy
2-4 months depending on zoneIn winter or late season, foliage dies back to ground level. Plant appears dormant but roots remain alive.
Apply 2-3 inches of mulch to protect roots in zones below 5. Stop harvesting 4-6 weeks before expected hard frost. Avoid disturbance to root zone. Plant will regrow in spring.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick beetles; encourage beneficial insects; neem oil spray if populations are high; rarely causes serious damage
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Remove plant debris and hiding spots; use beer traps; encourage ground beetles; hand-pick at dusk; copper barriers around beds
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Spray with strong water stream; insecticidal soap; neem oil; encourage ladybugs and lacewings
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Increase humidity; spray with water; neem oil; sulfur dust in dry conditions
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Improve drainage; avoid overwatering; remove affected plants; ensure good air circulation
Uses
Fresh Salads & Garnish
CulinaryTender young leaves add a bright, lemony flavor to salads, grain bowls, and dishes. The vibrant green color and delicate texture make it an elegant garnish for soups, fish, and refined cuisine. [source]
Sauces & Condiments
CulinarySorrel is the traditional base for classic French sorrel sauce served with fish and eggs. Blend leaves with cream, butter, or oil to make vibrant green sauces and purées. [source]
Traditional Herbal Remedy
MedicinalHistorically used in herbal medicine to support digestion, liver function, and as a mild laxative. Contains compounds traditionally valued for anti-inflammatory properties, though evidence is limited. [source]
Soups & Cooked Dishes
CulinaryWilts like spinach in hot dishes; classic in French sorrel soup (soupe à l'oseille) and various European cuisines. Reduces in volume significantly when cooked, creating rich, tart-flavored dishes. [source]
Natural Cleaning & Dye
HouseholdHigh oxalic acid content makes sorrel useful as a natural cleaner for removing rust and stains. Historically used to produce green dyes for textiles and crafts. [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 outer leaves once plant has 6-8 leaves, typically 4-6 weeks after transplanting. Pinch off leaves from outside toward center to encourage continued production. Harvest in morning after dew dries for best flavor and texture. Remove flower stalks immediately to extend leaf harvest. Harvest regularly to prevent flowering and toughening. Younger, smaller leaves are more tender and mild; larger leaves become increasingly tart. Can harvest continuously through the growing season, but stop 4-6 weeks before hard frost to allow plant recovery.
Fun Facts
- 🌱 Kew Green was specifically selected and named at Kew Gardens in London for superior leaf quality and mild flavor compared to wild sorrel, making it the gardener's preferred culinary variety.
- 🌱 Sorrel contains oxalic acid, which gives it its distinctive tart, lemony flavor—the same compound that makes spinach and rhubarb sharp-tasting, though sorrel contains it in higher concentrations.
- 🌱 In 18th and 19th century European cuisine, sorrel was so prized that it appeared on elite dining tables and in aristocratic gardens; it remains a staple in French haute cuisine despite being overlooked in many modern home gardens.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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