Leucophyllum spp.
Texas sage, Leucophyllum frutescens, is not a true sage like those in the Salvia genus, but rather an evergreen desert shrub in the figwort family, native to the arid regions of Texas and northern Mexico.
Best suited to USDA Hardiness Zones 8 to 10, some cultivated varieties can withstand conditions as cool as Zone 7.
Its five-lobed, funnel-shaped purple blooms resemble those of snapdragons, one of its close botanical cousins.
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These blossoms typically appear in response to changes in humidity and barometric pressure, often blooming just before or after a rainstorm.
Locals in its native range call this rugged woody plant “barometer bush.”
This rugged, low-maintenance shrub thrives in hot, dry environments and is a standout in xeriscapes.
Read on to learn about this low-maintenance, water-wise native and decide if it’s the right choice for your home landscape.
Here’s what we’ll cover:
What You’ll Learn
Texas sage leaves are covered in fine, moisture-retaining hairs called trichomes, giving the foliage a silvery, velvety appearance and the ability to thrive in hot, dry environments.
It’s also known by the Spanish name cenizo, meaning “ashen,” as well as silver leaf.
The shrub forms a loosely branching, upright shape with a rounded crown, making it an excellent choice for informal hedges, mass plantings, or as a standalone focal point in dry gardens.
Plants typically reach five to eight feet tall and four to six feet wide, though some cultivars are more compact.
Once established, it needs little maintenance beyond occasional pruning and thrives with minimal supplemental water.
While L. frutescens is the most commonly known and widely cultivated species referred to as “Texas sage,” several other members of the Leucophyllum genus also share this common name.
All are native to the arid and semi-arid regions of northern Mexico and the southwestern United States.
Quick Look
Common name(s): Barometer bush, cenizo, silver leaf, Texas sage
Plant type: Evergreen or semi-evergreen shrub
Hardiness (USDA Zone): 8-10
Native to: Mexico, Texas
Bloom time / season: Year-round intermittent in warm Zones, spring to fall in cool Zones
Exposure: Full sun
Soil type: Loose, sandy, well-draining
Soil pH: 6.0-8.4, slightly acidic to slightly alkaline
Time to maturity: 2 years
Mature size: 4-6 ft wide x 5-8 ft high
Best uses: Hedge, specimen, xeriscape
Taxonomy
Order: Lamiales
Family: Scrophulariaceae
Genus: Leucophyllum
Species: Candidum, frutescens, laevigatum, langmaniae, zygophyllum
While it looks delicate when in bloom, Texas sage is remarkably rugged. It shrugs off high temperatures, reflective heat from nearby pavements, and long dry spells.
Gardeners often use it in native or wildlife-friendly landscapes, where it draws in pollinators like bees and butterflies.
Different cultivars offer variation in size, flower color, and even bloom timing, which we’ll explore later on.
But they all share one common feature: low-maintenance appeal that performs beautifully with little to no pampering.
How to Grow
Texas sage is a slow grower that takes at least two years to become established and start blooming.
In the warmest regions, where the foliage remains evergreen, flowers appear intermittently year-round. In cooler climates, leaves may drop in the winter, with blooming limited to spring through fall.
Once established, Texas sage is drought tolerant and requires little maintenance, provided growers meet the following cultural requirements:
Climate
Texas sage is best suited to hot, arid climates with minimal rainfall and well-draining soil. It isn’t a plant that needs pampering, preferring a dry riverbed over a lush, loamy border.
The shrub does best with temperatures in the 70 to 95°F range and can tolerate brief dips into the 10 to 15°F range.
Some cultivars have greater cold tolerance and can survive in Zone 7, where the temperature may go as low as 0°F.
Light
Full sun is essential for healthy growth and abundant flowering.
In regions with extremely intense summer heat, providing some partial shade during the hottest part of the afternoon may help prevent leaf scorch, though this isn’t typically necessary.
Soil
Texas sage grows naturally in soils that are sandy or gravelly, with sharp drainage. Avoid overly fertile or moisture-retentive ground. A pH between 6.1 and 8.4 is suitable.
In regions where Texas root rot (Phymatotrichopsis omnivora) is a concern, maintaining soil toward the lower end of the pH range may help reduce risk.
Water
It’s better to provide too little water than too much. During the first growing season, provide supplemental water if it doesn’t rain during the week and the top two to three inches of soil are dry.
Once established, shrubs are drought tolerant and barring extensive drought, are unlikely to require supplementation irrigation.
As mentioned, many call this shrub the barometer plant because it blooms in response to atmospheric changes.
It is fascinating to note only nature causes this phenomenon, deep watering does not.
Fertilizer
Texas sage thrives on neglect and does not require fertilizer. Rich, moisture-retentive soil could promote fungal disease and root rot.
Cultivars to Select
In addition to the straight species, there are numerous cultivated varieties from which to choose. Here are a few to consider:
Desperado
Desperado® Texas sage aka ‘Greado’ offers growers a more compact option with mature dimensions of five to six feet tall and wide.
Select this variety for container gardening, neighborly hedges, and modest specimen plantings. Shrubs are hardy to Zone 8.
Purple Rain
‘Purple Rain’ is a hybrid that offers the silvery leaves and purple blossoms of the species plant but adds exceptional cold tolerance and hardiness to Zone 7.
Expect mature dimensions of five to eight feet tall and wide.
‘Purple Rain’ is available from Fast Growing Trees.
Silverado
‘Silverado’ boasts dense branching and a more regular form than other types. It exhibits outstanding cold hardiness to Zone 7.
Shrubs mature to six feet tall and wide.
‘Silverado’ Texas sage is available from Altman Plants via Home Depot.
Maintenance
Routine pruning isn’t necessary for Texas sage, but some occasional cleanup can help maintain a tidy, attractive shape.
Remove any dead or damaged branches, as well as those that interfere with the plant’s naturally rounded form.
Every three to five years, consider performing a deep rejuvenation pruning in late winter.
Trim back no more than one-third of the shrub’s total volume to avoid stressing the plant. This encourages vigorous new growth in the spring and helps maintain a dense, floriferous habit.
If you’re growing in USDA Zones 7 or 8, insulate your plants against winter cold and freezing.
While mulch is often the go-to, it can retain excess moisture and promote rot as temperatures start to rise.
A better choice is a burlap wrap tied securely around the branches but not touching the soil.
Propagation
There are several ways to start plants, including from seed, cuttings, and transplanting those purchased from a nursery.
From Seed
After blooming, seed pods form where the flowers were. When the pods turn brown and dry, press them gently to release the seeds inside.
You can also purchase seeds from a reputable source.
To sow:
- Fill seed-starting cells about three-quarters full with a loose, sandy potting mix.
- Moisten the medium thoroughly.
- Press one or two seeds onto the surface of the soil but do not bury them.
- Place in a location with bright, indirect sunlight.
- Keep the soil evenly moist but not soggy, and don’t allow it to dry out completely.
- When the first true leaves appear, thin to one seedling per cell.
When seedlings develop two or more sets of true leaves, they’re ready for transplanting.
From Cuttings
After the first flush of blooms in the spring, cut six-inch stems from the new green tip growth.
Snip off the lower leaves so the bottom two inches of the stems are bare.
Dip the cut ends in rooting hormone powder.
Plant cuttings two inches deep either directly in sandy garden soil or in six-inch containers filled three-quarters full with loose, well-draining potting mix.
Water just before the soil completely dries out to keep it moist but never soggy.
Set them in a full sun location outdoors, if you’re starting indoors, choose a location with bright, indirect sunlight.
New foliage indicates successful rooting.
Transplanting
Whether you’re working with a seedling, rooted cutting, or nursery plant, transplanting follows the same steps:
- Water the plant thoroughly the day before transplanting.
- Observe how deeply it sits in the current container.
- Prepare loose, sandy garden or potting soil to a depth slightly deeper than the current vessel and twice as wide. The growing medium should be crumbly and debris-free.
- For container growth, select a vessel two to four inches wider and deeper than the root mass.
- Unpot and set the plant into the new location at the same depth or slightly above the soil surface to facilitate proper drainage.
- Water when the top few inches of soil are dry and maintain even moisture until the plant is established.
When new growth appears, reduce watering frequency. Allow the soil to dry completely between waterings, and only supplement during prolonged dry spells.
Pests and Disease
Texas sage is not prone to problems with pests. Aphids, spider mites, and scale may occasionally pay a visit if the shrub is stressed.
The most significant disease threat is Texas root rot, aka cotton root rot, caused by the soilborne fungus, Phymatotrichopsis omnivora.
This pathogen thrives in alkaline, lime-rich soils and can cause rapid wilting and death of the plant. Symptoms include yellowing and browning of foliage, followed by sudden collapse.
There is no effective treatment once the shrub is infected, you’ll need to uproot and dispose of the plant.
Preventative measures include planting in well-drained soils and, if possible, adjusting soil pH towards the lower end of the plant’s tolerance range to make conditions less favorable for the fungus.
Overwatering or poor drainage can lead to fungal diseases such as root rot and powdery mildew.
Ensuring proper soil drainage and avoiding excessive irrigation are key to preventing these issues.
A Super Desert Bloom
Texas sage is a reliable flowering shrub that requires little moisture and maintenance. It’s the perfect choice for gardeners who xeriscape with native plants.
Are you growing Texas sage or are you planning to? Will you showcase it as a standalone specimen?
Or perhaps you’ll plant multiple for a formal or informal hedge around your property. Let us know in the comments section below!
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