Triangleleaf Bursage

Name: Triangleleaf Bursage
Brand: Outdoor Dream Builders

Ambrosia deltoidea

A compact Sonoran Desert native shrub with low litter and excellent pollinator value for butterflies and hummingbirds.

Reliably hardy in USDA zones 9-11 and thrives in the low desert; tolerates both hard frost and extreme reflected heat with no protection.

AMWUA Notes

A true very-low-water Sonoran native and important nurse plant; needs no supplemental irrigation once established.

Care Guide

💧Watering

Establish with occasional deep watering the first summer, then water only monthly or rely on rainfall; it is one of the most drought-adapted nurse plants of the Sonoran Desert.

✂️Pruning

Requires essentially no pruning; remove dead wood after a dry spell and let it keep its natural low mound rather than shearing.

🌱Fertilizing

Never needs fertilizer in native desert soil; feeding only encourages weak growth.

🛡️Pests

Largely pest-free; wind-blown pollen is its main drawback for allergy-prone clients rather than any insect problem.

☀️Seasonal Notes

Semi-deciduous in drought or hard frost, dropping leaves to conserve moisture and leafing back out with rain or warmth in spring.

Soil, Feeding & Propagation

🪨Soil

Native to rocky, gravelly Sonoran upland soils; thrives in lean caliche and alkaline pH 7.5-8.5.

💧Drainage

Needs sharp, fast-draining soil.

🌱Nutrient Needs

None — thrives in lean desert soil without fertilizer.

🌰Propagation

Propagated from seed; establishes slowly as a desert nurse plant.

📐Spacing

4-5 ft

🌳Roots & Placement

Deep, water-seeking but non-damaging roots; no hardscape concern.

Placement Tips

•Plant on 4-5 ft centers as a foundational nurse plant that shelters seedlings of saguaro and other natives.
•Ideal for restoration edges, decomposed-granite slopes, and low-water transition zones away from lawns.
•Its low litter makes it acceptable near patios, though its ragweed-family pollen means keep it away from bedroom windows.
•Combine with cacti and accents for an authentic Sonoran upland look.