Answer: Yes, a west wall is a demanding locale. The toughest vine for that spot is cat's claw. It blooms with yellow trumpet-shaped flowers in spring. It clings to the wall with tenacious little 3-pronged "claws" on its own, although it you wanted to later remove it, it can be difficult, and it "wears" on stucco over time. Yellow orchid vine (Mascagnia macroptera) is native to Mexico and takes full sun, minimal water and temperatures to 22 degrees. It blooms with yellow clusters of flowers from late spring to early summer. Yuca vine (Merremia aurea) is native to Baja and also takes full sun, minimal water and temps to 25. It has large morning glory-like yellow flowers from summer to fall. It is deciduous, dying back in winter, but regrows in spring. Both of these have twining tendrils that need something to grasp onto. I like my pink trumpet vine (Podranea ricasoliana), which is evergreen year around, and grows vigorously with strong, long whips of foliage. It needs something sturdy to support it along a wall, but it provides a very green lush appearance with minimal water. (All of these minimal waters mean once the plant is established, about a year after planting.) I like both the mandevilla and snail vine, but west walls are a bit much for them, in my opinion. They are also both heavier water users than these others. Of the two, snail vine would be better. I hope this info helps!
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