genus Wilcoxia
Leo Martin (Thu, 22 Sep 2016 22:16:50 PDT)
Shawn wrote
...None of the former Wilcoxias tolerate the summer heat of Yuma,
even when completely shaded. The native Peniocereus greggii hangs
around and grows, but is finicky here. The Mexican species don't
like the extreme heat, either.
This really surprises me. You aren't that much warmer than I am, and they
grow here vigorously. Are you sure you're watering them enough? They are
not low-water plants here.
Leo Martin
Zone 9?
Phoenix Arizona USA