ShadyStump
Imperial Masterpiece
What's the theory on the limestone? It can be VERY high pH, sometimes deadly high, so I'm curious as to the objective.things I potted in pure limestone. Which is the weed in 2 pots bottom right, they are the test subjects for fertilizer
And here's a pic of the cholla wood I collected today. 1 quart bottle and tape measure for scale.
Thinking about it, the big branching pieces may make better scaffolding used upsidedown, with the small ends in the pot, and your fig roots running down the branches from the cactus roots. Unless of course you want to make a rather interesting clump style with a tree starting at each point.
It's also occurred to me that a similar technique in reverse could make some fascinating vining species, with the vines growing up the branches. When the cholla finally rots away it would leave self-supporting trunks suspended midair.