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Oh...my...god. Looks like you might have to plant them further apart next year...lol. Absolutely fantastic!
I've wondered about that...mainly about the root thing. For sure the plant has to sense where it's boundaries are through it's roots then shift gear a bit.As soon as a single root finds the edge of the container, growth slows and we're pushing rocks uphill from there. It is at this point that our skill will be put to the test.