Native to the desert Southwest, the desert willow is not a true willow, but rather a member of the family Bignoniaceae. In addition to its ornamental appeal, the desert willow is remarkably adaptable. Considered a phreatophyte—a type of plant that accesses groundwater through deep roots—it requires minimal watering once established, making it an ideal candidate for low-maintenance landscapes. This deep root system also plays a crucial role in stabilizing soil and preventing erosion, particularly in sandy or gravelly terrain.
Plant type:
Deciduous leaf. H perennial
Zones:
Typically 7-10 (with some cultivars cold hardy down to zone 5), handles occasional drought.
Exposure:
Full sun
Size:
15 to 30 feet tall, 10 to 25 feet wide
Growth rate:
Moderate to fast, growing two to three feet per year in good conditions.
Flowers:
Trumpet-shaped blooms with ruffled petals are similar in appearance to orchid flowers. They may be shades of pink, purple, lavender, or white, often with intricate streaks or patterns in their throats. With the exception of sterile cultivars, the blooms are followed by long, bean-like seed pods. Flowers April through October.
Foliage:
Long and narrow with a pointed tip, similar to a willow leaf. Typically light to medium green in color.
Landscape uses:
Specimen plant, erosion control, xeriscaping, shade tree, windbreak or privacy screen, desert gardens.
Water sparingly, you don’t need water at all if you receive over 12 inches annually. Water slowly at the base of the tree 2 to 3 feet down Too much water is more of a concern than two little water. Maybe water every 2 weeks.
Care
Pruning
Prune Desert Willow in early summer, removing any damaged branches and broken twigs, cut off suckers growing from the base of the trunk, prune the canopy to thin out small branches. If you want to create an open tree like form without pruning, it will form a multi stemmed shrubby tree. Use handheld pruning shears or a small tree saw to cut small suckers and branches After completing the pruning clean your tools in a solution of one part bleach three parts water. Cut back during winter dormancy by a third to encourage blooming.
Fertilizer
You don’t need to fertilize mature trees, too much fertilizer damages the tree by stimulating rapid growth leading to overall weakness. The exception to the no fertilizer rule is during the first two years when the tree is becoming established to encourage strong, healthy growth, fertilize a young Desert Willow tree once a year early in the spring using a 555 granular fertilizer. use one cup for each 1/2 inch of trunk diameter. For a multi-trunk Desert Willow, Measure the largest main trunk, sprinkle the fertilizer, starting at the base of the trunk and spread it out to the drip line the area under the outer branches.
Propagating and growing
Add seed starting potting mix to insert trays with holes at the bottom and water with a fine mist to hydrate the soil. Add 1-2 seeds per cell. Store excess seeds below 80 degrees. No need to push them down. Mist with spray bottle to hydrate top of soil and help to push seed into soil. They will germinate in 4 to 6 hours.
And you will see green sprouting up. Add cover during germination period. Water from below to fully saturate. Add 3/4 inch of water to water tray. Let soak for the first 24 hours, then empty bottom tray and let soil dry out for 24 hours. After that water daily and let soak for 10 minutes. In 10 days you will see the first true leaves. Now remove bottom tray and water only from above with a fine misting nozzle after seedlings are about 3 weeks old.
Cornell university willow seed collection and germination.
Ref
https://www.gardendesign.com/trees/desert-willow.html
Brainy video
Wildflower.org texas at Austin university
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