Guayacan
Guaiacum coulteri
A striking Mexican shrub with deep violet-blue summer flowers that attract bees and butterflies.
Hardy only in the warmest USDA zones 9b-11; frost-sensitive below the mid-20s, so reserve it for the mildest low-desert microclimates.
AMWUA Notes
A high-water-to-establish tropical that becomes drought tolerant when mature; slow-growing and best treated as a featured specimen.
Care Guide
This slow-growing tropical prefers regular deep water every 7-10 days in summer to establish; mature plants become quite drought tolerant but grow very slowly.
Prune minimally, only to shape the naturally dense, twiggy form; its slow growth means little pruning is ever needed and heavy cuts set it back for years.
A light spring feeding can help the slow growth in lean soil.
Free of significant pests.
Evergreen in mild winters but frost-sensitive; masses of deep violet-blue flowers open in summer, especially after monsoon rains, on the dense evergreen canopy.
Soil, Feeding & Propagation
Well-drained rocky or sandy soils; tolerates caliche and alkaline pH 7.5-8.5.
Needs well-drained soil.
Low feeder.
From seed; very slow to establish.
8 ft
Slow, deep, non-aggressive roots; safe near hardscape.
Placement Tips
- •Slow to reach 8 ft; give it a warm 8 ft space as a prized specimen rather than expecting quick screening.
- •A collector-grade focal accent for a courtyard or protected patio where its violet bloom is showcased.
- •Low litter and dense form make it pool-friendly in warm microclimates.
- •Site in full sun with frost protection; its slow growth and beauty reward a sheltered, featured spot.
Features
Best Uses
Ecological Value
Attracts
Wildlife Value
Companion Plants
Quick Stats
Design Styles
Include in Your Project
Love Guayacan? Our landscape team sources from wholesale nurseries and can incorporate it into your design.
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Use this care guide to maintain your Guayacan. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Guayacan — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Guayacan need in Phoenix?
Guayacan is a moderate-water shrub once established. This slow-growing tropical prefers regular deep water every 7-10 days in summer to establish; mature plants become quite drought tolerant but grow very slowly. A high-water-to-establish tropical that becomes drought tolerant when mature; slow-growing and best treated as a featured specimen.
How big does Guayacan get?
Expect roughly 8 ft tall and 8 ft wide at maturity, with a slow growth rate. Allow about 8 ft of spacing when planting. Slow, deep, non-aggressive roots; safe near hardscape.
Can you plant Guayacan near a pool?
Yes. Guayacan is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated low.
Can Guayacan handle Arizona heat and winter frost?
Guayacan is hardy in USDA 9-11 and wants full sun. Hardy only in the warmest USDA zones 9b-11; frost-sensitive below the mid-20s, so reserve it for the mildest low-desert microclimates. Evergreen in mild winters but frost-sensitive; masses of deep violet-blue flowers open in summer, especially after monsoon rains, on the dense evergreen canopy.
Does Guayacan have thorns?
No. Guayacan is thornless, so it is safe alongside walkways, patios and play areas.
Is Guayacan safe around pets?
Guayacan 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 Guayacan bloom in Arizona?
Guayacan blooms in summer, with deep violet-blue flowers. The bloom draws bees, butterflies.
How much maintenance does Guayacan need?
Guayacan is low-maintenance. Leaf, flower and pod litter is rated low. Prune minimally, only to shape the naturally dense, twiggy form; its slow growth means little pruning is ever needed and heavy cuts set it back for years.
What kind of soil does Guayacan need?
Well-drained rocky or sandy soils; tolerates caliche and alkaline pH 7.5-8.5. Nutrient needs are low. A light spring feeding can help the slow growth in lean soil.
Is Guayacan native to Arizona?
No. Guayacan is not an Arizona native; it originates from the Sonora to Oaxaca, Mexico, but it is grown successfully in low-desert landscapes here.