Oh mankind. You impatient little critters. Why are you not able to wait for nature's path. The hurry of your minds...
I was at the garden centre yesterday, looking for a good buy to two. (Actually managed: Got a mulberry tree with 20% off, as well as a pair of kiwi's). On my way to the register, I came across pots with small ficus cuttings. And I decided to try another trunk fattening technique. By merging several trunk into one...
So I bought a put with some 15 small cuttings. When I removed them from the pot, unfortunately part of the work was already done: The roots were so badly intertwined, that I could not split them without *very* seriously mal-treating the plants. Ah well.. It is an experiment anyway.
So what I did then, is tie the trees just above root-level in a sort of a string small trees. These I tied around a small piece of wood, so it formed a circle of saplings. I then tried to weave the saplings together. The ide was that the individual saplings will merge to multiple other saplings. That way, when one root-system fails, the sapling will be fed by the others. Subsequently I tied a think cotton thread around the whole bunch to create a tight bunch of saplings with the stems touching on many places. I did do a bit of thinning, removing perhaps 25% of the canopies to provide light and air in the canopy.
After potting it, I have placed the whole thing in a clear plastic bag, on the window-sill above the heating. That will provide bottom-heat, stimulating re-growth of the roots.