Arid Zone Trees

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Disclaimer: The information provided here was gathered from research literature published by the University of Arizona, other professional Landscape and  Horticultural organizations and our experience at Arid Zone Trees. Always consult local landscape experts for recommendation for your specific area.

 

Foliage: Deciduous

Mature Height: 15 - 30

Mature Width: 15 - 30

Growth Rate: Fast

Hardiness: 10 degrees F

Exposure: Full Sun

Leaf Color: Green

Shade: Filtered to Dense

Flower Color:  Dark Lavender

Flower Shape: Trumpet

Flower Season: Spring to Fall

Thorns: None

Propagation Method: Cloning

Sizes Available: 24, 36

 

 

 

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The 'AZT Desert Amethyst' produces abundant blooms during the growing season against a canopy of narrow, weepy, deep green leaves making the tree a colorful and striking addition to the landscape. The characteristics that make 'AZT Desert Amethyst' stand out are the solid-colored, dark lavender flowers combined with thinner, more upright leaves.

'AZT Desert Amethyst' brings generous shade and much needed summer color to desert landscapes.

At first glance the name Desert Willow seems like a contradiction in terms. Desert Willow (Chilopsis linearis) is not a true willow. Many people have attributed the name to the long (2" to 5"), slender, glossy green leaves that typically grow towards the ground. The leaf canopy has a weeping, willow-like appearance. Much of the literature refers to Chilopsis as a large shrub to small tree growing to 15' to 30' tall with spreads of 10' to 15'. In landscape settings, where trees are regularly watered and fertilized, Chilopsis grow to the stature of most other desert trees.

 When incorporating Desert Willows into landscape designs architects should consider them medium sized mature trees that will occupy considerable space in the landscape. Chilopsis is an excellent accent tree when used in desert designs. Trees produce filtered shade that does not inhibit flowering of understory plantings. Young trees require regular pruning to develop and encourage graceful single or multi-trunked specimens. Without pruning, trees can look shaggy with thick leaf canopies and branches extending to the ground. Trunks are a slightly roughened gray- white and contrast nicely with the bright foliage and flowers.

 Desert Willows are found in all the deserts of the southwest US and northern Mexico. Trees are found from 1500' to 5000' elevations, usually along streams or basins where rainfall collects. Trees are drought and winter deciduous, generally drop leaves in late November, and hardy to 10 degrees F. In summer months, young trees can be irrigated every other week. For optimal growth and flowering, mature trees should be deep watered every 2 to 4 weeks depending on soil profile. In the landscape, Desert Willows grow best in well drained soils and full sun exposures.

 Chilopsis is one of the few desert tree species that produces flowers throughout the summer months. Trees produce beautiful, slightly fragrant, orchid-shaped flowers from early spring to fall. Chilopsis flowers also attract and provide nectar for hummingbirds. For many years growers and Universities have been selecting and breeding Chilopsis varieties for larger, brighter colored flowers. Depending on the variety, flower color varies from off-white to dark lavender. Flowers mature to produce 6" to 8" tan pods that spilt open to release seeds. Pods often do not drop from the tree and can be unsightly, particularly when trees are dormant. Pods can be pruned off during winter months.

 Seed pods and cast flowers can be a litter problem in some settings. Desert Willows are well adapted to both lawn and traditional desert landscape settings. They are used as summer color accent trees, individual specimens, as screen plantings (usually left unpruned) or in groupings. Chilopsis bring summer color, cold hardiness and a unique lush look to arid landscape designs.

 Variety 'AZT':

 Arid Zone Trees makes selections from thousands of trees propagated from seed. Only Individual trees having the most desirable physical qualities (branching habits, leaf color, leaf canopy, and flower color) and sound horticultural characteristics (rooting, cold hardiness and growth rate) are selected for further study.  These trees are then cloned (vegetatively propagated) and planted at our nursery for evaluation.  Only the best of these trees are then placed in cloning production and are designated Variety 'AZT'.  Since no one single selection of any desert tree specie is best adapted to all landscape applications, we continually search for new additions to our Variety 'AZT'.

Chilopsis linearis 'AZT Desert Amethyst' is propagated and available exclusively from Arid Zone Trees. 

Cultural Practices:

Foster the development of a more dispersed root system and reduce the risk of wind throw by arranging irrigation emitters at varying distances from the trunk to encourage roots to "seek out" water and nutrients. Frequent watering is needed to promote good terminal growth on newly planted trees. Irrigation emitter arrangement along with other information on irrigations practices for desert trees can be found at Irrigation Practices for Desert Trees.

Prune as needed to reinforce the structure and form of the tree. Periodic thinning is the most desirable method of pruning. Pruning to remove about 20% of the canopy during the growing season helps promote root development that is proportional to the shoot growth of young trees. Removing more than 20% of the canopy can inhibit rooting, lead to sunburn injuries that can later be invaded by wood boring insects, and encourage undesired re-growth made up of dense flushes of branches and leaves. Selective pruning should be used to promote the development of a symmetrical canopy with well spaced branches. Avoid hedging or heading back desert species, as this will only stimulate excessive branching. Use tree stakes only when absolutely necessary and then only briefly. Select low-breaking, upright trees as they occupy no more space than a single-trunk specimen yet retain the natural wind resistance of trees found growing native in desert settings. Always use clean, sharp tools that are cleaned regularly in a 10% solution of bleach. For detail pruning guide see Pruning Desert Trees.

 Periodically insect pests can be a problem on some desert trees.  On young trees, insect infestation can slow typical seasonal growth. Inspect trees during the growing season for common garden sucking insects such as aphids, thrip, whiteflies or psyllids. During dry months, (May and June) in dusty conditions, spider mites can appear. Monitor for infestation and apply controls as needed. Spray applications of water or water and Safer Soap give short-term control (3 to 7 days) for small insect population. For heavy infestation or longer control use federally registered insecticides. A contact insecticide application will kill existing adults. An application with a systemic soil drench will provide 8 to 12 weeks control for any post application insect hatchings or migration of insects. Before using pesticide for the first time or on new plants or cultivar, treat a few plants and check for phytotoxicty. Always read label and follow label instruction before using pesticides. For pesticide control recommendations contact a licensed pest control advisor.