It can be quite a challenge to get aerial roots to grow in the right spots. Couple of strategies I have found useful:
- wrapping Sphagnum around spots you want to root with some plastic - almost like an air layer but you want to leave an escape path for the roots towards the ground if you can to avoid roughing them up when they are young and you need to get them heading in the right direction. Experimented with using poly/ag pipe as a growth channel for the roots to run down. Some successes but a LOT of messing around and disappointments along the way.
- taking cuttings and once established, planting them under a branch to look like an aerial root and getting them to graft into the existing branch. Works pretty well with figs BUT you can get some ugly grafting bulges as its hard to control for.
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Here’s an example of a schefflera I used both techniques on. Look for the aerials to the right. The bigger is the grafted cutting. Couldn’t get it to work on the left hand of the tree for some reason, so have decided to live with it as is! This tree has been grafted together from a bunch of cuttings and then wrapped in spahgnum for a year to get the roots cascading down the front to break up the straight lines of the cuttings.
I like the look of your new pot, definitely suits the tree. There is the question of scale relating to your tree and the banyan style you are aiming for. The example shots you have above are of trees probably a meter tall and wider than that across the canopy. This scale helps with aerials as they can bulk out surprisingly quickly. For a smaller tree you need to be prepared to cut old ones off and regrow if they get too chunky. Personally if I had your tree I’d look to build out a highly ramified canopy and not worry about the aerial roots until the canopy takes shape and you take a view if its size will handle it OK. Enjoy it as a smaller canopy fig that is going to look good surprisingly quickly. In the meantime strike plenty of cuttings from the tree as you ramify it. Encourage them to grow long and straight for 20 to 30 cms. Once they take, you can look to graft them onto your fig and/or plant them in a low, wide pot (retainer trays for large pots work well with a couple of holes in them) and work like crazy to get them to graft together to look like a banyan.
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