Stone fruit pits are best sown in the fall, so they can naturally be stratified by winter. They need the cold to crack open the thick "shell".

You cold try cracking th epit, to get to the "nut" on the inside (the viable part). That can be thrown in the fridge for 2 or 3 months.

Plum pits tend to be smaller then peaches, so you may not be able to crack them without destroying the embryo. I would wait till the fruit is ripe in the fall, and plant the pits where you want them.

Worse comes to worse, if they arent pallitable, you can always graft some more desirerable types..

I haven't had good luck holding pits over to plant in fall, I think they tend to dry out too much inside. I do better if I just plant them right away, and forget about them until the next spring. Be sure to mark the planting site with a stake, and if they are particularly valuable, plant them inside a cylinder of hardware cloth half sunk into the ground so animals don't get them.

Thanks for the comments. I think I'll plant them in containers and keep them in a sheltered spot until next Spring. We'll see what grows.

eukofios, update? Any luck growing them? I’m attempting the process now and this thread came up in a google search.

Same here, Angel.