
Plant of the week: Texas ranger (desert-adapted plant)
The Texas ranger, a desert-adapted plant also known as the barometer bush, is a highly versatile and underappreciated shrub suitable for xeriscape gardens in the Southwest and northern Mexico. Often overlooked and improperly pruned into coifed hedges in residential and commercial landscapes, this plant, when allowed to grow naturally, offers stunning aesthetics and ease of care. It is particularly valued for its ability to thrive in challenging conditions, including difficult soils and high temperatures, while other plants struggle during the summer months. Its common name, barometer bush, stems from its tendency to produce a vibrant flush of lavender blooms after summer rains, providing continuous color through the fall season.
Early specimens of the Texas ranger were first discovered and cultivated in Texas during the 1800s. Today, a wide array of varieties are available, offering different names, shapes, and sizes to meet diverse landscaping needs. For optimal growth, Texas rangers require full sun exposure. Maintenance is minimal due to their naturally good form; light pruning is sufficient to remove old, straggling branches and encourage rejuvenation, ideally performed in the spring in preparation for summer growth and blooming. Fertilization is generally not required for these resilient plants.
Several specific varieties are recommended for different landscape purposes. 'Sierra Bouquet' (Leucophyllum pruinosum) is noted for its highly fragrant, grape bubblegum-scented violet flowers. For creating large hedges, 'Green Cloud' (Leucophyllum frutenscens) is an excellent choice, while 'Chihuahuan sage' (Leucophyllum laevigatum) is suitable for a more informal and wild aesthetic. More compact options include 'Thunder Cloud' (Leucophyllum candidum), which features striking silver-white foliage and deep purple flowers, and 'Cimarron' (Leucophyllum zygophyllum), characterized by gray-green foliage and blue-hued blooms. For a more formal and dense shrub with lavender flowers, 'Rio Bravo' (Leucophyllum langmaniae) is recommended. 'Compacta' (Leucophyllum frutenscens), one of the earliest introductions, naturally forms a dense, rounded shape, requires minimal pruning, and is well-suited for most residential gardens, reaching up to 5 feet tall with profusions of pink flowers that emerge with increased humidity. Another variety highly recommended by the Arizona Municipal Water Users Association is 'Langman’s sage' (Leucophyllum langmaniae).
When incorporating Texas rangers into a landscape, they are ideal for sunny areas that require mass plantings, screens, barriers, or splashes of color, making them a perfect fit for xeriscape designs. While not particular about soil type, good drainage is crucial. Amending planting holes with mulch and gypsum is often necessary to improve drainage, as poor drainage combined with overwatering can lead to root rot. It is important to research and select the appropriate variety for the available space, as most Texas rangers can grow to between 4 and 8 feet tall if given adequate room. These plants are also cold-tolerant, capable of withstanding temperatures as low as 10 degrees Fahrenheit.
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