I can't seem to throw away or even compost avocado seeds -- and keep sprouting them and potting them up
So to date, I have 6, possibly 7 avocado plants and 2 more, no 3 more seeds starting to grow roots and/or sprout.
They're all being grown in standard dimension containers though. My plan is to keep increasing pot size until I deem it unwise to go any further, then root prune to keep them within bounds.
It's true the leaves get pretty big -- as they mature, they seem to up their leaf size. The seedling that you just sprouted probably have 1"~3" leaves. My oldest -- maybe 5 or so years old -- has started growing 7"~8" leaves this spring. Coupled with the unpredictably long internodes, I really don't know how they'll respond to the usual bonsai treatment.
I'm going to drastically prune one or two of them soon -- just before setting them outside. I'll have to cut off the early spring growth cluster of the largest leaves, so there might be something to report later on in the summer.