The actual issues around avocados from pits are that 2 slightly different varieties planted near one-another cross pollinate and thus produce more heavily. There are very few varieties in commerce, so better to sprout a wrinkly skin plus a smooth one, and plant both.
You can always graft for earlier bearing, or tastier fruit. I'd graft rather than wait.
Beth Bauer wrote:On avocados:
My kids love sprouting the seed with toothpicks over water, but that’s as far as any I’ve ever started got. Then I read somewhere on the Internet (so you know it’s true) that most seeds from grocery store avocados will never produce a plant that bears fruit. Has anyone had any luck ever sprouting their own fruitful avocado tree?
"I live on Earth at present, and I don't know what I am.I know that I am not a category.I am not a thing—a noun.I seem to be a verb, an evolutionary process—an integral function of the universe."
On apple seedlings:
I'm randomly tossing some seeds into hedgerows. I've certainly appreciated foraged fruit from wayside trees, so I'm adding some for future generations. Other fruit too. You tend to get something with qualities from its parents - so I favour seeds from my own apples over the mediocre bought jobs.
To encourage earlier fruiting, it apparently helps to encourage downward growing - to this end I've paired up seedlings and bent each of their leaders down, and tied it against its buddy's stem, pruning off unnecessary upward twigs. Only done that this spring, so a while before I'll see results. This technique apparently applies to all trees and climbers - it tells the plant it's got high enough.
With bulk seeds sold for food there is no guarantee of viability so test a small batch for sprouting before committing to a large planting. The untested seeds in this video did not sprout although previous purchases did,
Under one of the apple trees growing in the allotment garden I found some apple seedlings. Yes, I know some of the apples were fallen down, and I did not pick them up. That's what happens then.
Because I don't want all apple trees to grow at the same spot, I carefully removed them from there. They are in a container now. When they'll have grown a little taller they'll be transplanted to a nice spot ... I know Paul wouldn't approve of that, because the 'deep root' is harmed by transplanting the seedlings...
"Also, just as you want men to do to you, do the same way to them" (Luke 6:31)
Once upon a time there were three bears. And they were visted by a golden haired tiny ad: