I want to make a standard(1) with scions from a Rhipsalis pilocarpa, or mistletoe cactus. I need a rootstock that:
- Is columnar
- Is unbranched
- Has good longevity (at least 20 years)
- Can adapt to high humidity and light shade
- Has a slim, clean, stem at least 3' long
Stem rigidity is optional, because the plant would be staked at about 3' (by the graft union). I will be side grafting.
I have been considering using a freshly rooted Selenicereus cutting as the rootstock. Is that a good choice? If so/no, what other options do I have?
(1) Standard in this context means 'tree form', as a standard rose bush. This term is used with plants that do not naturally grow in tree form, trained to one single stem, or 'trunk', resembling a tree, although smaller in size.