Photo: Andreas TaegerCC BY 4.0via iNaturalistresized / cropped
Alexandra's Rhubarb Plant Care
Rheum alexandrae Batalin
Updated · Sources · How we source care data
Rheum alexandrae, also known as Alexandra's rhubarb, is a striking perennial plant with large, heart-shaped leaves that are a vibrant shade of green with bold red veins running throughout. Its unique foliage and impressive size make it a standout addition to any garden or landscape.
Every 7–10 days
Full sun to partial shade
50–75°F
40–70%
At a glance
How do you care for Alexandra's Rhubarb?
Water Alexandra's 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 Alexandra's Rhubarb?
Alexandra's Rhubarb (Rheum alexandrae) belongs to the Polygonaceae family within the Rheum genus. Alexandra's Rhubarb is native to China, Tibetwhy popular: Plant enthusiasts are drawn to Rheum alexandrae for its ornamental value and historical significance. This rare species is highly sought after for its beauty and cultural importance in traditional Chinese medicine..
Alexandra's Rhubarb displays a large, clumping perennial growth habit, reaching up to 5 ft tall with a spread of approximately 3 ft. Alexandra's Rhubarb produces small, greenish-white flowers on tall spikes.
Leaf size: approximately 12 inches.
How Often Should You Water a Alexandra's Rhubarb?
Rheum alexandrae 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 Alexandra's Rhubarb Need?
Alexandra's Rhubarb thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Alexandra's Rhubarb Prefer?
Rheum alexandrae grows best at temperatures of 50–75°F. Alexandra's Rhubarb prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Alexandra's Rhubarb?
Rich, well-draining soil with plenty of organic matter. Good drainage is essential for Alexandra's Rhubarb to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Alexandra's Rhubarb?
Feed Alexandra's 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 Alexandra's 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 Alexandra's Rhubarb?
Alexandra's Rhubarb can be propagated through division, seeds. Similar propagation techniques also apply to himalayan rhubarb plant care, which shares the same genus.
Is the Alexandra's 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 Alexandra's Rhubarb?
Alexandra's 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 Alexandra's Rhubarb Need?
Alexandra's Rhubarb grows outdoors in USDA Zone 5a – 8b. It survives winters down to planting zone 5a. Alexandra's Rhubarb is native to China, Tibetwhy popular: Plant enthusiasts are drawn to Rheum alexandrae for its ornamental value and historical significance. This rare species is highly sought after for its beauty and cultural importance in traditional Chinese medicine..
Hardiness Zone
Zone 5a – 8b
Keep exploring plants
Alexandra's 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.
Alexandra's 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 alexandrae Batalin, family Polygonaceae (first published in Trudy Imp. S.-Peterburgsk. Bot. Sada 13: 384 (1894)) — World Flora Online record, IPNI name record.
- Pet toxicity: Alexandra's 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.
- Photo: Andreas Taeger, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 5a – 8b, estimated from the plant's typical growing conditions.
- 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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