We planted a seed from the avocado and would like to know how to pinch it back from 12 inches to 6-8 inches.
How Do You Pinch an Avocado Plant
Certified GKH Gardening Expert
We would not recommend pruning an avocado that much, especially when it is that small. Right now, you can take maybe 2-3 inches off, but any more than that will likely kill it. You don't want to prune more than 1/3 of a plant in a year.
To prune it, just use a sharp pair of scissors to snip off the part of the plant you wish to remove.