Ironwood
Olneya tesota
One of the Sonoran Desert's longest-lived trees — an evergreen, multi-trunk 25-by-25-foot canopy on almost no water, with dusty-lavender bloom in late spring.
Thayne Tuason / Wikimedia Commons / CC BY 4.0 — license
Protected Native Plant Note: This plant may require special review before removal, relocation, transport, or installation. AE will confirm requirements when protected native plants are involved.
Why AE uses caution: Thorny branches, a slow 25 ft by 25 ft mature spread and seasonal leaf, flower and pod litter make placement unforgiving. Ironwood is also a protected native plant in Arizona: landowner permission plus Arizona Department of Agriculture notification or permit requirements apply before protected natives are removed or relocated, so salvaged specimens need documented legal origin.
See the full AE Use With Care libraryNot sure if this plant belongs near your pool, wall, pavers, or foundation?
AE reviews microclimate, root intrusion risk, and soil compatibility.
Schedule: Deep, infrequent — typically every 10–21 days mature, more often in summer establishment.
Emitters: Multiple large emitters or bubblers placed out at the drip line, not at the trunk.
Encourages deep roots and long-term tree stability. AE designs irrigation to expand as the tree matures.
Arizona yards have very different microclimates. West-facing walls, glass, artificial turf, pavers, travertine, porcelain, and pool decking all increase reflected heat. AE considers these before confirming placement.
- Mind clearance from pool deck
- Mind clearance from walls
AE verifies pool deck, paver, foundation, wall, and utility clearances before final planting.
Quick Facts
- Plant type
- Tree
- Mature size
- 25 ft tall, 25 ft wide
- Growth rate
- Slow
- Sun
- Full sun
- Water use
- Very low
- Bloom season
- Late spring
- Flower color
- Dusty lavender
- Foliage
- Gray-green
- Evergreen / Deciduous
- Evergreen
- Thorns / spines
- Sharp
- Litter level
- Medium
- Pool area
- Use with care
- Maintenance
- Low
- Privacy value
- Medium
- Shade value
- High
- Native
- Sonoran native
About Ironwood
Ironwood is the native tree we recommend when a client wants real desert character and is willing to wait for it. AMWUA lists it as a Sonoran Desert native, hardy to about 20°F, very low in water use, slow growing, and maturing near 25 feet tall and 25 feet wide as an evergreen, typically multi-trunk tree with gray-green, medium-textured foliage and a dusty-lavender bloom in late spring. It carries thorns and drops seasonal litter — leaves, flowers and pods — so it is a canopy tree for open ground rather than a tight side yard. Ironwood is also a protected native plant in Arizona. University of Arizona Cooperative Extension explains that removing or relocating protected natives requires landowner permission and involves notification or permit requirements administered by the Arizona Department of Agriculture, so salvaged specimens should come with documentation of legal origin. Buy legally sourced material, give it space, water it deeply and infrequently, and it will outlast everything else in the landscape.
Best uses: Long-lived evergreen native shade tree and signature specimen for large yards with room for a 25-foot multi-trunk canopy
AE Designer Opinion
Design Uses
- Legacy shade canopy in large native desert yards
- Signature specimen tree in a wide front-yard island
- Up-lit nighttime focal point in a desert lighting plan
- Wildlife-supporting native canopy over granite and boulders
- Anchor tree in low-water turf conversions with open ground
- Long-term canopy planted alongside a faster interim shade tree
Care & Maintenance
- Very low water once established; deep and infrequent soakings only
- Water through the first two summers to build a deep root system
- Prune lightly in the warm season; lift the canopy gradually as it matures
- Avoid over-thinning — keep interior structure for wind resistance
- Expect a seasonal cleanup pass for leaf, flower and pod drop
- Keep irrigation emitters away from the trunk and out to the root zone
Common Homeowner Mistakes
- Planting it within a few feet of a patio, walkway or pool deck
- Buying a salvaged specimen with no documentation of legal origin
- Overwatering a very-low-water native on a shared shrub valve
- Over-thinning or lion-tailing the canopy, which weakens the structure
- Expecting fast shade and replacing it before it ever matures
Placement Warnings
⚠ Thorns and a slow, wide 25-foot habit mean this is not a tight side-yard or walkway tree. Ironwood is a protected native plant in Arizona, so salvaged specimens should come with documentation of legal origin and the required landowner permission and Arizona Department of Agriculture notification or permits.
- Thorny branches — keep it back from walkways, gates, play areas and pool coping
- Plan the full 25-foot mature width; it is not a side-yard or courtyard tree
- Protected native plant: verify documented legal salvage or nursery origin
- Seasonal leaf, flower and pod litter falls under the canopy
- Slow growth — it will not solve a shade problem in the first few seasons
AE reviews final placement based on sun, irrigation, drainage, mature size, and overall design.
Pairs Well With
- Brittlebush
- Damianita
- Golden Barrel Cactus
- Deer Grass
More Arizona Plants Like This
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