How to Grow Rhubarb
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Rhubarb
Rheum rhabarbarum
vegetableRhubarb is a perennial plant grown for its long, tart stalks that are used in pies, jams, and other culinary preparations. The plant produces large, attractive heart-shaped leaves and can live for 15+ years with proper care. It's one of the few perennial vegetables and is particularly valued in cooler climates.
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Example Rhubarb timeline · Pittsburgh, PA (Zone 6b)
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Plant Rhubarb
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 Rhubarb
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7, tolerates zone 8 with afternoon shade and extra water
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Get my Rhubarb timeline →Growth Stages
Dormancy
November to FebruaryPlant lies dormant in winter with no visible growth; roots continue developing underground
Mulch with 2-3 inches of straw or leaves in fall; ensure good drainage to prevent root rot; do not water
Vegetative Growth
April to JuneLarge leaves fully develop; stalks elongate and thicken; plant reaches mature size
Maintain consistent moisture; apply mulch around base to retain moisture and suppress weeds; fertilize monthly with nitrogen-rich fertilizer or compost tea; remove seed flowers as they appear
Flowering
May to JulyTall flower stalks with small greenish-pink or red flowers emerge from the crown
Remove flowering stalks immediately to encourage more stalk production and preserve plant energy; do not harvest stalks when flowering
Decline
July to OctoberGrowth slows in summer heat; leaves may yellow or wilt; plant enters semi-dormancy
Increase watering in hot weather; provide afternoon shade in zones 7-8; stop harvesting by early July to allow plant recovery; apply heavy mulch to cool soil
Common Pests
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Remove infested leaf stalks; use yellow sticky traps; apply neem oil in early spring; clean up plant debris where beetles overwinter
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Hand-pick in early morning; use pheromone traps away from plant; apply spinosad or neem oil; encourage beneficial insects
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Remove debris and dense mulch that harbors pests; use beer traps; apply diatomaceous earth; handpick at night
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Ensure excellent drainage; avoid overwatering; plant crowns slightly above soil level; remove affected plants; do not plant rhubarb in same location for several years
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Remove affected leaves; avoid overhead watering; apply copper fungicide if severe; improve air circulation
Uses
Pies and Desserts
CulinaryRhubarb's tart flavor is classic in pies, crumbles, and cobblers, typically paired with sweeteners to balance its natural acidity. It's also used in jams, compotes, and sauces. [source]
Digestive Aid
MedicinalTraditional herbal medicine has used rhubarb root as a mild laxative and digestive tonic, containing compounds that may support gastrointestinal health. The root (not the stalks) contains anthraquinones with potential laxative properties. [source]
Natural Cleaning Agent
HouseholdRhubarb's oxalic acid content makes it useful in natural cleaning solutions for removing rust and stains from fabric and metal surfaces. The plant has historically been used for bleaching and stain removal. [source]
Beverages and Syrups
CulinaryRhubarb is fermented into wines, cordials, and shrubs, or cooked down into syrups for beverages and cocktails. Its tartness makes it excellent for refreshing drinks. [source]
Pollinator Support
WildlifeRhubarb flowers attract bees and other pollinators, providing an early season nectar source. The large foliage also provides shelter for beneficial insects. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Do not harvest in the first year; in year 2, harvest lightly (a few stalks); from year 3 onward, harvest regularly when stalks are 10-15 inches long and fully colored. Grasp stalk at base and pull with a twisting motion; never cut stalks. Stop harvesting by early July to allow plant recovery. Only harvest leaf stalks, never the leaves themselves (they contain toxic oxalic acid). Peak harvest is April to June.
Fun Facts
- 🌱 Rhubarb was originally used as a medicinal plant in ancient China and Tibet, and was so valued it was traded along the Silk Road before becoming a culinary staple in Europe.
- 🌱 A single rhubarb plant can produce stalks for 15-20 years or longer, making it one of the longest-producing perennial vegetables in the garden.
- 🌱 The leaves contain high levels of oxalic acid and are toxic if consumed in large quantities, but the stalks contain much lower levels and are safe to eat when cooked.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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