Giant Buckwheat Plant Care
Eriogonum giganteum S.Watson
Updated · Sources · How we source care data
Eriogonum giganteum, with the common name St. Catherine's lace, is a species of wild buckwheat in Southern California.
Every 7–14 days
Full sun
50–90°F
20–60%
At a glance
How do you care for Giant Buckwheat?
Water Giant Buckwheat every 7–14 days, letting the top layer of soil dry out between waterings, and give it full sun. It prefers temperatures of 50–90°F (10–32°C) and 20–60% humidity.
What Is the Giant Buckwheat?
Giant Buckwheat (Eriogonum giganteum) belongs to the Polygonaceae family within the Eriogonum genus. Giant Buckwheat is also known as St. Catherine's Lace.
Giant Buckwheat displays a low mounding perennial growth habit, reaching up to 1 ft tall with a spread of approximately 2 ft. Giant Buckwheat produces small clusters of tiny white, pink, or yellow flowers.
Leaf size: approximately 2 inches.
How Often Should You Water a Giant Buckwheat?
Eriogonum giganteum requires watering every 7–14 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 7–14 days
Let soil partially dry between waterings
What Light Does the Giant Buckwheat Need?
Giant Buckwheat thrives in full sun.
Light Requirement
Full sun
What Temperature and Humidity Does the Giant Buckwheat Prefer?
Eriogonum giganteum grows best at temperatures of 50–90°F. Giant Buckwheat prefers humidity levels of 20–60%.
Temperature
50–90°F
Humidity
20–60%
What Soil Mix Works Best for a Giant Buckwheat?
Well-draining sandy or gravelly soil with low fertility. Good drainage is essential for Giant Buckwheat to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Giant Buckwheat?
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 Giant Buckwheat?
Giant Buckwheat can be propagated through seeds, division. Similar propagation techniques also apply to nodding buckwheat plant care, which shares the same genus.
Is the Giant Buckwheat Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Giant Buckwheat, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
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 Giant Buckwheat?
Giant Buckwheat is susceptible to aphids, spider mites. 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 Giant Buckwheat Need?
Giant Buckwheat grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. In cooler regions, grow Giant Buckwheat as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Giant Buckwheat 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 Eriogonum genus — compare its care with other Eriogonum species on PlantoScan.
Eriogonum is part of the Polygonaceae plant family — browse all Polygonaceae genera and species.
Giant Buckwheat thrives in bright light and direct sun — see other bright-light plants.
More Eriogonum Species
Other Eriogonum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Eriogonum giganteum S.Watson, family Polygonaceae (first published in Proc. Amer. Acad. Arts 20: 371 (1885)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Giant Buckwheat, so we can't confirm whether it is safe for cats and dogs. 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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