Answer: In your gardening zone, Yucca recurvifolia is a 4-6' tall evergreen shrub with lance shaped recurving to arching leaves. The foliage is more blue green than most Yucca spp. Soft Leaf Yucca is generally a single stem in youth and can become multi trunked with age. The growth habit is rosette in youth, with age the plant can become tree like. This Yucca will bloom late summer to fall, the flowers are creamy white and bell shaped and are borne on 3-5' spikes. This shrub has excellent heat and drought tolerance. Desert Willows are equally drought tolerant and enjoy the same growing conditions so they should make good garden companions. Planting 4 feet from the fence should provide adequate room for the plants. I don't think you'll find them invasive.
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