Lol...yeah, that was pretty much my reaction the first time I tried forcing aerial roots as well!
I lost a bunch a pictures from this era so I don't have any "in progress" pictures
But I tried creating a "straw" by wrapping some sphagnum in paper towel to form a root guide. I naively though "I'll get one single root". But, as I'm sure you now suspect! I didn't!
6/28/2020
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The right single aerial root formed naturally. The left twisted-cluster-fuck was what came out of my first "straw" attempt to force a root! And this is only a 2 inch drop! It was much smaller when I first removed the straw. Were I careful, I think I could have trimmed back to a single root. But I didn't.
4/16/2022
Roughly 2 years later, it looked like this:
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11/19/2022
Hard to see in this one...but after just a few months more...
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You can see that the aerial roots are starting to compete with the size of the trunk! Ficus will maybe not be as bad. Schefflera aren't "woody" trunks in the way ficus are...they don't tend to thicken much. But, thinking about what aerial roots do, it's not hard to imagine that they can thicken faster than the trunk. It is a short cut to ground for all foliage beyond the root. As the branch grows out beyond the aerial root, the root will support more and more foliage...eventually more than the trunk is supporting...at least for that branch.
I did this experiment to learn what I could before possibly trying to force aerial roots on a ficus root over geode planting I have in development. After seeing how this experiment has turned out, I've rethought if I will even attempt it on the geode planting!