Answer: Clytostoma callistegioides, the lavender trumpet vine, is evergreen but tends to lose the oldest leaves during the fall and winter months. Sounds as though your neighbor does a little pruning during the summer months to remove some of the oldest stems (and therefore the oldest leaves). These are vigorous plants so pruning them back at the end of winter will result in lots of healthy new growth, along with leaves that will remain green for a year or two before yellowing and dropping off. Lavender trumpet vine attaches itself to support with tendrils, much like a morning glory vine. As such, it will need something to wrap its tendrils around in order to climb a stucco wall. You can string wire from top to bottom or side to side on your stucco wall and the tendrils will have something to hold on to.
Enjoy your beautiful lavender trumpet vine!
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