How to Grow Dilatatum
Dilatatum
Rheum dilatatum
vegetableDilatatum is a variety of culinary rhubarb known for its large, broad leaves and thick, tender petioles (leaf stalks). It's a perennial plant that produces edible stems prized for pies, jams, and cooked desserts. This vigorous variety is valued for its productivity and flavor.
When should you plant Dilatatum in your zone?
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Example Dilatatum timeline · Pittsburgh, PA (Zone 6b)
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Plant Dilatatum
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 Dilatatum
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Dilatatum dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-7, tolerates zone 8 with afternoon shade
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Get my Dilatatum timeline →Growth Stages
Vegetative Growth
April-JuneRapid expansion of large leaves and thickening of petioles (stems); plant reaches mature height
Maintain consistent moisture and fertility. Remove seed stalks (flower buds) promptly to direct energy to leaf growth. Side-dress with compost monthly.
Flowering
June-July (if not removed)Tall flower stalks emerge from center of plant with small cream or pink flowers in clusters
Remove flower stalks immediately at their base to prevent bolting and energy loss. Deadheading extends stem production.
Summer Maintenance
July-AugustPlant continues producing harvestable stems; growth slows in peak heat
Continue harvesting stems by pulling gently from base. Reduce harvesting frequency in late summer to allow plant energy recovery. Maintain mulch and watering.
Common Pests
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Ensure excellent drainage; avoid overwatering. Remove and destroy infected crowns. Improve air circulation.
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Remove and destroy infested stems; use insecticide sprays in spring. Maintain garden hygiene by removing dead plant material.
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Handpick in early morning; use Japanese beetle traps away from plants. Apply neem oil or insecticidal soap if severe.
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Use beer traps, copper barriers, or diatomaceous earth. Hand-pick at dusk. Remove garden debris where they hide.
Uses
Desserts & Preserves
CulinaryDilatatum's tender, tart stems are ideal for rhubarb pie, crumbles, jams, and chutneys. The large petioles require less processing and cook down into smooth, flavorful compotes. [source]
Fresh Cooking
CulinaryThe mild flavor and tender texture make Dilatatum excellent for stewed rhubarb, smoothies, and as a souring agent in savory dishes. Pairs well with strawberries and ginger. [source]
Traditional Remedy
MedicinalRhubarb has been used in traditional medicine as a digestive aid and mild laxative due to its anthraquinone compounds, though modern use requires caution and professional guidance. [source]
Natural Dye
HouseholdRhubarb roots and stems can be used to produce yellow and rust-colored dyes for textiles, a traditional practice in fabric dyeing. [source]
Pollinator Attraction
WildlifeRhubarb flowers, when allowed to bloom, attract bees and other pollinators, providing early-season nectar in spring gardens. [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 year 1. In year 2, harvest lightly (only a few stems). From year 3 onward, harvest heavily June-July by pulling stems gently from base when 12-18 inches long. Stop harvesting by late July to allow plants to recover. Never harvest more than one-third of plant's stems at one time. Remove flower stalks immediately to prevent seeding and energy loss.
Fun Facts
- 🌱 Rhubarb is botanically a vegetable but legally classified as a fruit in the US for tariff and culinary purposes due to its use in desserts.
- 🌱 The leaves of Dilatatum and all rhubarb contain toxic oxalic acid and should never be eaten; only the stems (petioles) are safe for consumption.
- 🌱 A well-maintained rhubarb plant can remain productive for 15-20 years or more, making it a long-term investment for perennial gardens.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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