Batten Blooms
PL. —Baileya multiradiataBotanical illustration — drop image
Baileya multiradiata

Desert Marigold

SpringSummerFall
7a–11bHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Not in bloom
Summer
Peak bloom
Fall
In bloom
Peak bloom
In bloom
Background

Baileya multiradiata is a perennial wildflower native to the Chihuahuan and Sonoran deserts of the southwestern United States and northern Mexico. It produces bright yellow, daisy-like heads on woolly, gray-green stems and blooms from early spring through fall — one of the longest bloom windows of any arid-land native. It performs well in xeriscape plantings, naturalized desert gardens, and highway medians.

The plant grows naturally in sandy washes, decomposed granite, and rocky slopes with fast drainage. It is short-lived as a perennial but self-seeds prolifically, forming persistent colonies without intervention. Clay or compacted soil causes rapid root failure. Soil pH of 7.0–8.5 suits it well. Infrequent deep watering during prolonged drought extends the bloom season; in-ground plants in established desert gardens rarely need supplemental irrigation. A gravel or decomposed granite mulch around the crown discourages rot during monsoon rains.

All parts of the plant contain sesquiterpene lactones, including radiatin and hymenin, which are toxic to sheep and in high doses to cattle and horses. Most browsing mammals avoid it in the wild, which contributes to its persistence across overgrazed rangeland. Its extended flowering period makes it a reliable nectar source for native bees, beetles, and painted lady butterflies.

Good companions
Desert GlobemallowBrittlebushRubber RabbitbrushBlue FlaxGlobemallowsChuparosasBrittlebushes
Care guide
SunFull sun
WaterLow
SoilWell-drained, sandy or gravelly, dry
Spacing12–18 in
Height12–24 in
Zone7a – 11b
Native RegionAZ, CA, NV, NM, TX, UT
Direct sowFrost hardy
Seasonal tasks
spring
cutThin seedlings to 12–18 inches apart once they reach 2–3 inches tall. Do not attempt to transplant; taproots are sensitive to disturbance.
sowFor spring sowing, scatter seeds on bare, well-drained soil after last frost and press lightly into the surface — do not cover. Germination requires light.
summer
cutRemove spent stems down to the nearest lateral bud or basal foliage to encourage repeat flushes of growth through summer and into fall.
watchMonitor soil drainage closely after summer monsoon rains. Standing water around the crown causes rapid root rot. Add decomposed granite around the base if needed.
fall
sowDirect sow seeds on the soil surface in fall; seeds need light to germinate and will stratify naturally over winter for strong spring emergence.
watchLeave the final flush of seed heads to mature and drop in fall. This ensures natural reseeding and colony persistence without replanting.
Common problems

Phytophthora Root Rot

Symptoms

Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.

Treatment

Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.

Crown Rot

Symptoms

Lower leaves yellow and wilt; the base of the rosette turns brown and soft, sometimes with white fungal threads at the soil line. Plants collapse in wet conditions.

Treatment

Remove and destroy affected plants. Improve drainage and avoid overhead watering. Do not mulch directly against the crown. Space plants for airflow and avoid replanting in the same wet spot.

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.