John - How does Mother Nature prune the Cassia? By the larger branches breaking in storms?
I have to prune mine so my path is cleared, otherwise it is impossible to use that path. There are 2 Cassias and 2 Wild Lime trees/shrubs all growing in that area. (Both plant species are host plants for different butterflies!) The whole clump of growth gets quite large. It's all part of my butterfly and hummingbird garden. The birds perch in there all the time and use it for cover. I host hummingbirds and Painted Buntings in Winter. These plants are favored by the wildlife and get lots of use.
Teresa - Thank you. I have 2 Old Blush climbing roses growing up that cattle panel arbor. I grow them in the pots because of the root knot nematodes that are in my ground soil. They surprisingly survive and thrive that way. I have another set of climbing roses (Chinese roses) growing on a wooden arbor near my backdoor. (Also growing out of pots, though I suspect that those roses have roots extending into the ground through the bottom drain holes in the containers.) I've had to think "outside the box" on how to grow plants that I see being grown and trained up arbors in other parts of the country. I envy folks up north with much better soil than I have here in Florida. (Though I do not envy their long, cold Winters.)