Rhubarb Plant Care
Rheum rhaponticum L.
Updated · Sources · How we source care data
Rheum rhaponticum, the false rhubarb, rhapontic rhubarb or rhapontic, is a plant species in the genus Rheum found in the wild. It is the only Rheum species found only in Europe, and is now restricted to the Rila mountain range in south-western Bulgaria.
Every 7–10 days
Full sun to partial shade
50–75°F
40–70%
At a glance
How do you care for Rhubarb?
Water Rhubarb every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–75°F (10–24°C) and 40–70% humidity. Fertilize it every 6 months during the growing season. It is reported as toxic to pets, so keep it out of reach of pets.
What Is the Rhubarb?
Rhubarb (Rheum rhaponticum) belongs to the Polygonaceae family within the Rheum genus. Rhubarb is native to the wild. Rhubarb is also known as Rhapontic Rhubarb, Garden Rhubarb.
Rhubarb displays a large, clumping perennial growth habit, reaching up to 5 ft tall with a spread of approximately 3 ft. Rhubarb produces small, greenish-white flowers on tall spikes.
Leaf size: approximately 12 inches.
How Often Should You Water a Rhubarb?
Rheum rhaponticum requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Rhubarb Need?
Rhubarb thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Rhubarb Prefer?
Rheum rhaponticum grows best at temperatures of 50–75°F. Rhubarb prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Rhubarb?
Rich, well-draining soil with plenty of organic matter. Good drainage is essential for Rhubarb to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Rhubarb?
Feed Rhubarb every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Rhubarb?
Divide and repot every 3-4 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Rhubarb?
Rhubarb can be propagated through division, seeds. Similar propagation techniques also apply to himalayan rhubarb plant care, which shares the same genus.
Is the Rhubarb Toxic to Pets and Children?
Toxic (caution)
Reported as toxic in our plant data. Not verified by the ASPCA.
Toxic to humans and pets if ingested
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Rhubarb?
Rhubarb is susceptible to aphids, slugs, snails. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Rhubarb Need?
Rhubarb grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Rhubarb is native to the wild. In cooler regions, grow Rhubarb as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Rhubarb is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Rheum genus — compare its care with other Rheum species on PlantoScan.
Rheum is part of the Polygonaceae plant family — browse all Polygonaceae genera and species.
Rhubarb thrives in bright light and direct sun — see other bright-light plants.
More Rheum Species
Other Rheum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Rheum rhaponticum L., family Polygonaceae (first published in Sp. Pl. : 371 (1753)) — World Flora Online record, IPNI name record.
- Pet toxicity: Rhubarb is reported as toxic to pets in our plant data (not verified by the ASPCA), so treat it with caution. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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