How to Grow Large-leaf Red
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Large-leaf Red
Rheum rhabarbarum var. undulatum
vegetableLarge-leaf Red is a vibrant rhubarb variety known for its deep crimson-red leaf stalks and robust growth habit. This perennial plant produces thick, tender petioles that are prized for culinary use in pies, jams, and beverages. It's a cold-hardy, long-lived plant that returns year after year with minimal maintenance.
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Example Large-leaf Red timeline · Pittsburgh, PA (Zone 6b)
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Plant Large-leaf Red
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 Large-leaf Red
Around Oct 14≈ 180 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Large-leaf Red dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-8, with best performance in zones 3-6 where cold winters promote dormancy
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Get my Large-leaf Red timeline →Growth Stages
Establishment
4-6 weeksYoung crowns or seedlings develop root systems and initial leaf growth; plants appear small and delicate
Keep soil consistently moist; avoid harvesting in first year to allow crown establishment; remove flower stalks to direct energy to leaf production
Vegetative Growth
8-12 weeksLarge, deeply lobed leaves emerge on long, thick stalks; foliage develops characteristic red coloration; plant gradually expands
Maintain consistent moisture; apply 2-3 inches of mulch around base; fertilize monthly with balanced or high-nitrogen fertilizer; remove any flower buds that form
Stalk Development
6-8 weeksPetioles (leaf stalks) thicken and lengthen; intense red color develops; leaves can reach 24+ inches long
Continue regular watering and fertilization; side-dress with compost; ensure adequate spacing for air circulation; monitor for pest damage
Maturity
4-6 weeksPlant reaches full size with thick, vibrant red stalks ready for harvest; dense foliage crown is fully established
Begin selective harvesting of outer stalks; continue watering during dry periods; fertilize after harvest to support regrowth
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Ensure excellent drainage; avoid overwatering; plant crowns with tops slightly above soil; remove infected plants immediately; apply fungicide if needed
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Remove infested stalks; use yellow sticky traps; apply neem oil or spinosad in spring; remove plant debris in fall
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Handpick affected leaves; spray with insecticidal soap; encourage natural predators; remove leaf damage promptly
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Handpick in early morning; use pheromone traps; apply spinosad or neem oil; encourage beneficial insects
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Improve air circulation; avoid overhead watering; remove affected leaves; apply copper or sulfur fungicide; clean up debris
Uses
Pies, Jams & Desserts
CulinaryRhubarb is the classic ingredient in strawberry-rhubarb pie and jam, prized for its tart flavor that balances with sweeteners. The thick, tender stalks of Large-leaf Red are ideal for cooking and provide beautiful color to finished products. [source]
Beverages & Preserves
CulinaryRhubarb stalks can be stewed into syrup for drinks, cordials, and cocktail mixers. Large-leaf Red's vibrant color makes particularly striking preserves and compotes. [source]
Traditional Laxative & Digestive Aid
MedicinalRhubarb has been used in traditional medicine as a gentle laxative and digestive tonic, primarily using the root. The stalks contain compounds that may aid digestion. [source]
Natural Cleaning Agent
HouseholdRhubarb leaves contain oxalic acid and can be used to make a cleaning solution for rust removal and outdoor stain treatment, though leaves themselves are toxic and not for consumption. [source]
Pollinator Support
WildlifeIf allowed to flower, rhubarb produces tall flower spikes attractive to bees and other pollinators, supporting garden ecosystem health. [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 light harvesting in year 2, heavier harvesting from year 3 onward. Pull outer stalks by grasping near base and twisting gently away from crown; cut with knife if stems are tough. Harvest spring through early summer (April-June in northern zones). Stop harvesting by mid-July to allow plant to store energy for next year. Remove flower stalks immediately when they appear. Mature stalks are 1-2 inches thick and 18-30 inches long.
Fun Facts
- 🌱 Rhubarb is botanically a vegetable but is classified as a fruit in the United States for tariff purposes since 1947, following a court ruling.
- 🌱 Large-leaf Red varieties produce stalks that are naturally sweeter and less bitter than green varieties, requiring less added sugar in cooking.
- 🌱 Rhubarb leaves contain high concentrations of oxalic acid and are toxic to humans, but the stalks are completely safe and nutritious when cooked.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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