Propagation by layering?
I'm curious if anyone has tried propagating their Passifloras by layering. I'm not referring to air-layering, but what I think is also called ground layering.
It's not something that I had ever tried with any plant, but a friend in Orange County recently had great success with his P. parritae. I won't tell the details--it's his story--but after a period of 4 months this late Winter/Spring he was able to get tremendous rooting and isolate I believe about a dozen plants.
So I started trying this on my small P. parritae, which is overpotted in a 5 gallon pot. I took a vine and removed three non-adjacent leaves and buried those nodes, leaving the nodes (and leaves) in between above the soil line. I managed to do this in a one gallon pot containing soil, which I kept moist. I didn't damage the stem or in any other way prepare it--I just removed the leaves on the three nodes. I checked a few days ago, after 3 weeks, and there were roots already on one of the below ground segments. The vine had grown, so I buried yet another node. I'll check on everything at the two month point.
I also want to try this with my P. membranacea, which sometimes roots for me, sometimes not.
I'm guessing that layering would be most useful for those plants that are difficult to propagate from cuttings.