In most instructions I've read about growing an avocado plant, it says things like the following:
In 2-6 weeks, roots and a stem will sprout from the seed. When the stem is about six inches long, trim it in half.
What's the purpose of doing this?
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Trim the roots, yes. This will encourage a denser root system. Trim the stem? I can't see why. An avocado is a tree and no amount of trimming on the stem will make it grow like a bush. Avocado's exhibit apical dominance although not to the same degree as an evergreen. One stem will be more dominant and grow more than the others.