Key Facts
- Edible stalks are used fresh or cooked but leaves are poisonous
- A hardy herbaceous perennial grown for thick leaf stalks
- Prefers fertile, moisture retentive but well drained soil
- Best harvested from established plants after the first season
- Flower stalks are usually removed to concentrate growth in stalks
- Performs best with a period of winter chill to break dormancy
- Propagated commonly by division or root cuttings rather than seed
Rhubarb is a hardy herbaceous perennial grown for thick edible leaf stalks used fresh or cooked. Leaves contain oxalic acid and are poisonous so only stalks are eaten.
Identification
Plants form clumps about 2 to 3 feet tall and wide with large triangular leaves and stout petioles. In late spring to early summer many varieties send up tall panicles of small flowers that often rise above the foliage.
Where to grow and best uses
Garden rhubarb performs well in cool temperate gardens and is typically suited to USDA zones 3 to 8. It grows best in full sun in cool climates and tolerates part shade where summers are hot. Use rhubarb in edible borders cottage garden beds or larger mixed vegetables and fruit patches where a spreading clump is acceptable.
Soil light and watering
Choose fertile moisture retentive yet well drained soil with good organic matter. Consistent moisture produces better stalk quality while waterlogged conditions cause crown rot and reduced vigor.
Planting and seasonal care
Plant crowns or lift and divide clumps in spring. Allow roughly 2 to 3 feet between crowns so clumps can expand. Avoid heavy harvesting in the first season and begin regular harvests from established plants the following year. Remove flower stalks to concentrate growth in the leaf stalks.
Propagation and controlling spread
Propagate by dividing crowns or using root cuttings in spring. Crowns expand over years and periodic division is the usual way to control size and renew vigor. Seed can be used but may not come true to named cultivars.
Safety
Only the stalks are eaten. Leaves contain oxalic acid and other toxic compounds and should be discarded away from children and pets. Consult local poison control resources for exposure guidance.
Frequently asked questions
- How fast does Rhubarb grow?
- Growth rate varies by climate and soil. Crowns expand year to year and clumps commonly reach about 2 to 3 feet across over several seasons. Established plants produce harvestable stalks after the first growing season.
- When should I plant rhubarb?
- Plant crowns or divide established clumps in spring so roots can establish before the main growing season.
- How do I propagate rhubarb?
- Divide crowns or take root cuttings in spring. Division is the standard method for named garden varieties.
- How should I water rhubarb?
- Keep soil consistently moist for good stalk quality. Avoid waterlogged conditions because they lead to crown rot and poor vigor.
- Are rhubarb leaves poisonous?
- Yes. Leaves contain oxalic acid and are poisonous. Remove and discard leaves where children and pets cannot reach them.
- What if my rhubarb flowers?
- Flower stalks are usually removed to concentrate growth in the leaf stalks and preserve harvest quality.
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