USDA Hardiness Zone 6

Plants are known to be cold hardy to at least -10°F.

Other Cold Hardiness categories

Common Name: White Flowering Zinnia, Desert Zinnia

White flowering zinnia is native to the Southwest and Northern Mexico. A low mounding plant, it becomes completely covered with small white flowers with a central yellow disk, similar to our native prairie zinnia, Zinnia grandiflora. Blooms from June through fall. Desert zinnia is toxic if ingested by humans.

Common Name: One-Seed Juniper

One-seed juniper is the juniper found in the dry hills and mesas throughout our area and the Southwest in elevations from 3500 to 8000'. Slow growing on top, it's tap root grows quickly and deeply, making them very difficult to transplant. It's habit is shrubby with several stems and branches growing low to the ground, making it a good habitat plant. Extremely drought, heat and cold tolerant.

Common Name: Showy or Pink Evening Primrose

Showy evening primrose is a plains states native, including the Texas Panhandle. Showy evening primrose blooms whitish pink in late spring, with each flower lasting a single day, opening in the morning and closing later in the day. The leaves are green narrow and lance-like and emerge from spreading rhizomes. The plant spreads prolifically by rhizomes and seeds, especially in amended and well watered soil. It is not well mannered in a mixed bed or border, I consider it invasive for the garden.

Common Name: Desert Bird of Paradise

Desert never equates with drab. The flowers on Desert Bird of Paradise are simply stunning! Though classified as a Zone 7 plant, I’ve grown Desert Bird of Paradise for 3-4 years near a south facing wall and have seen several others around Amarillo, without it dying back it to roots. However, if it does, just prune out the dead wood. Eye catching flowers bloom continually from June into fall and attract hummingbirds. Finely divided green leaves. It is said to survive on 8” of rainfall, but monthly soakings enhance it. C. mexicana, Mexican Bird of Paradise and C.

Common Name: Whirling Butterflies Gaura, Apple blossom grass

This is an improved variety to our native gaura, it is known to be short lived for 4 – 5 years, but is worth replacing periodically for its spectacular fireworks display. Placed as a focal point, G. lindheimeri ‘Whirling Butterflies” was the plant most commented on in my front garden. Native  more to eastern Texas and Louisiana, a terrific plant for city or country in a medium water-use location. Any plant with long wispy stems that flows with the wind is an asset to your border.  Other cultivars to use are ‘Siskiyou Pink’ and ‘Pink Cloud’, two pink varieties.

Common Name: Silky Thread Grass

A mid height grass suitable for any low water-use garden, city or country. It does self-seed somewhat, but I hadn’t noticed it to be a problem in a xeric setting (simply remove or transplant them). It's greatest attribute is it's gently flowing nature int he wind. It is native to Texas and the southwest. I saw it growing along the slopes of the Chisos Mountains in Big Bend National Park. It pairs well with yucca, agave, Calylophus and any native shrub.

Common Name: Zephirin Drouhin Rose

Remarkable old Bourbon rose dating to 1868. Remarkable for fragrance and bright cerise pink flowers, and best of all, thornless canes -- it's people friendly!  Not strictly a climber, but a mannerly climber.

Zephirin Drouhin is planted in a low water-use location.

Common Name: Goldenrod 'Wichita Mountains'

This variety purchased from Sunshine Nursery in  Clinton, Oklahoma is drought tolerant, I've planted it in a low water-use bed. The flowers are so dense and golden, it looks like a golden torch. Sometimes seen as Solidago speciosa rigidiuscula, 'Wichita Mountains'

Common Name: Feather dalea

If you find yourself in Palo Duro Canyon at the end of April or beginning of May, the purple haze dotting the cliffsides is feather dalea. Sporadic blooms will open after showers throughout summer, though never as profuse as in springtime. With monthly irrigation in a xeric garden, feather dalea adds color and texture with it's twiggy, but sturdy, appearance. Small purple flowers combined with white plumes carries the haze impression from a distance.

Common Name: Scarlet hedgenettle, Texas Betony

Texas betony is a workhorse of the garden once established, putting on a plethora of scarlet blooms midsummer on. A member of the mint family with square stems, the foliage is fragrant, but the plant is not invasive as classic mints tend to be. Hummingbirds love Texas betony. Though native to the Southwest, it is found in moist crevices and steep, stony places in the mountains in moist, well-drained sand, loam, and clay. Texas betony is said to be cold hardy to -20°, however, I have not found it reliable in returning each winter. Yet, it is worth replanting.

Common Name: Broom Snakeweed, Broomweed

Broom snakeweed is a small mounded subshrub with yellow greenish thread-like leaves, native throughout the Southwest and western half of the North American continent. In the fall, it becomes covered in small golden yellow flowers. Bees and nectar butterflies are attracted to it in numbers. Usually grows to only a foot tall.

Common Name: Blue Grama Grass

Blue grama grass is a short, clumping warm season grass with thin blue green blades that is native throughout the Great Plains and Southwest. Able to grow in poor, dry soils, blue grama grass needs only about 12 inches of annual precipitation to survive. If seeded thick enough and with moderate irrigation, blue grama will form turf. Once establish, reduce to monthly supplemental irrigation, and mow not more frequently than monthly to a height of 4 inches. One advantage of blue grama over buffalograss is the speed of germination; it will germinate in 5-7 days.

Common Name: Winterfat

Winterfat, formerly Ceratoides lanata, is a drought and heat tolerant that normally is found in poor, alkaline soils throughout the Southwest in grasslands and scrublands. Winterfat is a low rounded woody shrub with pale blue green to gray leaves. The distinctive characteristic is the long wooly seed stalk it puts up in the summer. Towards winter, the stalk appears to be covered with wool.

Common Name: Prairie Verbena, Purple Prairie Verbena, Dakota Vervain

Prairie verbena is one of my favorite plants, it is one of the first to bloom in the spring and one of the last to be affected by freezes in the fall. Small in stature, but it has my respect for giving so much with so little given (from me) in return. It's short lived, maybe just one year or three. Green, finely cut hairy leaves, with several branched stems that put on clusters of tiny lavender, purple, violet or pink flowers. Blooms from spring to fall. Readily reseeds, not invasively so. Its volunteer seedlings are easy to dig up and transplant.

Common Name: Red Canna

A great plant for those people who must have their foliage fix. Despite their large foliage, cannas will do quite well in a medium water-use area with well amended soil.There are dwarf varieties and others that will reach 7 feet. Leaves shred easily by hail, but will recover after several weeks. Cannas sprout from thick rhizomes. Although subtropical, cannas easily winter over in the Texas Panhandle and spread to form a thick root mass.

Common Name: Johnson's Blue Hardy Geranium, Blue Cranesbill

It's hard to pass up Johnson's blue geranium with the deep blue flower and interesting foliage. A hybrid cultivar, the most blue hardy geranium with delicate, finely cut leaves. Plant in your woodland border, medium water use. For a long time this was the most well know hardy geranium, or cranesbill, as this genus is commonly known.

When the name geranium is spoken most of the time, people are referring to the genus, Pelargonium, the red flowering perennial that is used extensively throughout the world. the common Pelargonium is only cold hardy to 28°.

Common Name: Select Blue Catmint, Catnip

This is not one of the invasive catmints, but it will reseed some and is not as attractive to cats as most catmints. A low growing, sprawling, drought tolerant perennial that projects a hazy blue appearance with its light lavender blue flowers and grayish green foliage. It is aromatic, not necessarily fragrant. A fast spreader and prolific bloomer even in it's first year, it will begin to bloom after six weeks.

Common Name: Prairie Sun Black-eyed Susan

Rudbeckia is advertised as heat and drought tolerant, but I have not found it so. I’ve found it to require at least weekly watering during the heat of the summer. A shortlived, southern native perennial, it likes the humidity and rain from southern climes. These very large and stunning composites may be worth your effort, just place within the correct hydrozone.

Common Name: White Bouquet Tansy, Silver Tansy

A non-invasive tansy from southern and central Europe for your low water-use bed and border that will reseed somewhat. A short lived perennial. Gray cut-leaf foliage provides an attractive white element in the garden.

Strongly aromatic.

Common Name: Dwarf Chamisa or Dwarf Rabbitbrush

I prefer dwarf chamisa to the full size species. Dwarf Chamisa fits better into home xeric areas and has green leaves, rather than gray or silvery. It's silvery stems combine well with its green foliage and yellow gold flowers. Although given the species and variety name "nauseosus" it has a pleasant fragrance. Dwarf chamisa blooms profusely in late summer and will readily re-seed.

Common Name: Chisos Rosewood

The Arizona rosewood is classified either as a quite tall shrub or short to mid height tree. One of it's best features is that it is evergreen, with slender glossy green leaves approximately 3 inches long. It puts on small white flowers in summer. One of the few drought tolerant, native, evergreen trees available in the trade. Slow growing.

Common Name: Rose mallow, Texas Star

Two southern native hibiscus suitable for the medium to high water-use garden. Large green leaves are superseeded by very large and showy flowers. H. moscheutos  is cold hardy and has some of the largest flowers, up to a foot across in red, rose and white, usually with a red eye. H. coccineus blooms scarlet 3 inch flowers -- not cold hardy but worth trying as a specimen container plant.

Common Name: Buffalograss

Buffalograss is North America's only native turfgrass, grows well in clay soils. A warm season grass that spreads by stolons, it is our best selection for low water-use lawns. It will survive very nicely on 15-20 inches of annual precipitation. For green turf summer long, a once a month watering is all that is needed. The common species is short to 4-8 inches, light gray/green to blue/green and goes dormant in fall, greening up again in May. Many newer varieties are being developed for wider blades and deeper green colors, such as Legacy® and Turffalo®.

Common Name: Creeping Oregon Grape Holly

Mahonia repans is one of my favorite plants with four seasons of interest. Low growing and spreading evergreen shrub is native throughout the Rocky Mountains. Bright yellow berries in spring are followed by black berries in summer and reddish winter foliage. The leaves are thick, glossy and holly shaped. Creeping Oregon grape holly prefers amended, humusy soil that replicates its native habitat as an understory plant in woodlands, but is low water-use once established. It will spread to cover an area, but not invasive. Very attractive!

Common Name: Grayleaf Cotoneaster

Grayleaf cotoneaster is a wonderful low growing shrub for the xeric garden. Evergreen or semi-evergreen in colder winters, it provides good winter interest, along with the other seasons. Small oval shaped silver/gray leaves cover the many arching branches. Tiny white flowers appear in late spring followed by red berries in late fall and winter. Low water use once established.

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