Flattop Buckwheat
Eriogonum fasciculatum
A compact Sonoran Desert native with white-pink summer blooms that age to rust-red seed heads and attract bees, birds, and butterflies.
Hardy in USDA zones 7-11; a Mohave and Sonoran native tolerant of mid-desert cold and low-desert heat, evergreen and requiring no protection.
AMWUA Notes
A low-water native with exceptional pollinator and seed-bird value; its persistent seed heads feed wildlife into winter.
Care Guide
Low water; a deep soak every 2 weeks in summer suffices and it tolerates real drought, resenting overly wet soil.
Leave the rusty seed heads through fall and winter for wildlife and interest, then shear back lightly in late winter to renew the low mound.
No fertilizer needed in native soil.
Pest-free and an important larval host and seed source for native insects and birds.
Evergreen low mound; white-to-pink summer flowers age to rust-red seed heads that persist into winter and feed birds.
Soil, Feeding & Propagation
Sandy, gravelly, sharply drained soils; tolerates caliche and alkaline pH 7.5-8.5.
Needs sharp, fast-draining soil.
None — thrives in lean desert soil without fertilizer.
From seed; short-lived and self-sows.
2 ft
Shallow, non-aggressive roots; ideal as a rock-garden and path-edge filler.
Placement Tips
- •Very low at 1 ft by 2 ft; space 2 ft apart and mass as a flowering groundcover or rock-garden filler.
- •Ideal tucked among boulders and along decomposed-granite path edges.
- •Low litter and small size make it a tidy pool- and walkway-side plant.
- •Plant in full sun; it is a superb low-water pollinator and seed-bird plant.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
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Use this care guide to maintain your Flattop Buckwheat. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Flattop Buckwheat — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Flattop Buckwheat need in Phoenix?
Flattop Buckwheat is a low-water shrub once established. Low water; a deep soak every 2 weeks in summer suffices and it tolerates real drought, resenting overly wet soil. A low-water native with exceptional pollinator and seed-bird value; its persistent seed heads feed wildlife into winter.
How big does Flattop Buckwheat get?
Expect roughly 1 ft tall and 2 ft wide at maturity, with a moderate growth rate. Allow about 2 ft of spacing when planting. Shallow, non-aggressive roots; ideal as a rock-garden and path-edge filler.
Can you plant Flattop Buckwheat near a pool?
Yes. Flattop Buckwheat is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Flattop Buckwheat handle Arizona heat and winter frost?
Flattop Buckwheat is hardy in USDA 9-11 and wants full sun. Hardy in USDA zones 7-11; a Mohave and Sonoran native tolerant of mid-desert cold and low-desert heat, evergreen and requiring no protection. Evergreen low mound; white-to-pink summer flowers age to rust-red seed heads that persist into winter and feed birds.
Does Flattop Buckwheat have thorns?
No. Flattop Buckwheat is thornless, so it is safe alongside walkways, patios and play areas.
Is Flattop Buckwheat safe around pets?
Flattop Buckwheat is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Flattop Buckwheat bloom in Arizona?
Flattop Buckwheat blooms in summer-fall, with white-pink aging to rust flowers. The bloom draws bees, butterflies.
How much maintenance does Flattop Buckwheat need?
Flattop Buckwheat is low-maintenance. Leaf, flower and pod litter is rated low. Leave the rusty seed heads through fall and winter for wildlife and interest, then shear back lightly in late winter to renew the low mound.
What kind of soil does Flattop Buckwheat need?
Sandy, gravelly, sharply drained soils; tolerates caliche and alkaline pH 7.5-8.5. It needs no supplemental feeding. No fertilizer needed in native soil.
Is Flattop Buckwheat native to Arizona?
Yes. Flattop Buckwheat is native to Arizona and to the Mohave and Sonoran Deserts, so it is adapted to local rainfall, soil and heat.