I've done the above, too. It works on the gulf coast.
Also, I've put them in a 30 gal. plastic drum, cut in half length wise, covered them with shaving and horse manure and left them all winter. Watered them whenever I thought abot it. Come sping the balls sprouted with "BUNCHES" of little seedlings. I seperated these and set them out in pots, until they were 5 - 6 ins. tall. Then transplanted them. Mistake. Keep them potted until they go dormint in the fall and then transplant them to where you want them. Do it and your grandchildern and their neighbors will hate you! Once they get established, they just go wild! "course I don't care, 'cause they'll have all the bow wood they'll ever want, if they're of that bent.
Good luck, and have fun.
Some of my trees, I've pruned off the lower limbs each year, to try to make them grow tall and straight. Hasn't been long enough to tell if that works, or not.
Johnny/JAG