Pam Penick's Four Expert Plant Picks for Southwest Gardens
Austin-based gardening author Pam Penick recommends four resilient, water-wise plants suited for the Southwest's challenging climate, detailing their
Gardening author Pam Penick has selected four standout plants for Southwest gardens. Based in Austin, Texas, Penick highlights trees and shrubs known for their drought tolerance and visual appeal.
Plant Selection Details
Penick's recommendations include a fragrant tree, a rain-triggered bulb, a long-blooming sage, and a cheerful shrub. The following table summarizes the key details for each plant.
| Plant Name | Botanical Name | USDA Zones | Size (H x W) | Conditions | Native Range |
|---|---|---|---|---|---|
| Arroyo sweetwood | Myrospermum sousanum | 8-10 | 15 to 25 ft tall, 10 to 20 ft wide | Full sun to partial shade; well-drained, alkaline soil | Northern Mexico |
| 'Labuffarosa' rain lily | Zephyranthes 'Labuffarosa' | 7-10 | 6 to 12 in tall and wide | Full sun to partial shade; well-drained soil | Mexico |
| Darcy’s Mexican sage | Salvia darcyi | 6-10 | 3 to 4 ft tall, 4 to 6 ft wide | Full sun to partial shade; well-drained soil | Northeastern Mexico |
| Pyramid bush | Melochia tomentosa | 8-11 | 3 to 8 ft tall, 2 to 6 ft wide | Full sun to partial shade; sandy to rocky, well-drained limestone soil | Brazil, Mexico, South Texas, southern Florida |
Arroyo Sweetwood: A Fragrant Alternative
Penick advocates for the underused Arroyo sweetwood. She describes it as a fast-growing yet extremely drought-tolerant deciduous tree. Its compact, multi-trunk form and fragrant spring flowers make it a worthy alternative to crape myrtle. Loose clusters of small white flowers attract pollinators and emit a vanilla scent. After blooming, apple-green seedpods dangle from arching branches. The compound leaves turn yellow in fall, extending the tree's season of interest.
'Labuffarosa' Rain Lily and Darcy's Mexican Sage
Nothing is more welcome after a hot, dry spell than the sight of 'Labuffarosa' rain lily flowers, according to the source. Their pink and white petals appear as if sprinkled with fairy dust. The strappy leaves form a clumping ground cover. The bulbs are long-lived and easy to plant, needing only 2 to 3 inches of soil cover. Penick suggests pairing them with fall-flowering oxblood lily for a pink and red combination.
Penick expresses a desire for more of her single Darcy's Mexican sage plant. Its cardinal red flowers attract bumblebees and hummingbirds from April into November. The plant forms an attractive mound of triangular, light-green leaves. Native to high elevations in Mexico, it thrives in flatlands too. "I often forget to water it and it’s very forgiving," Penick notes, though an occasional deep soak is beneficial. It dies back in winter and should be pruned hard before spring. For a fall display, she recommends pairing it with bird pepper.
Pyramid Bush for Pollinators
The final pick is the pyramid bush, a silvery green shrub covered in dainty magenta flowers all season. It blooms reliably through summer heat and drought. Butterflies and bees flock to it, making it ideal for pollinator gardens. In southern areas, its lance-shaped, fuzzy leaves stay evergreen. In northern parts of its range, foliage may freeze back but the plant returns in spring. Penick plans to add these shrubs to a hot, sunny driveway bed to make it more welcoming. The plant's cheerful blooms work without complaint.
