Most of the plums will
root fairly readily if put in the ground soon after separation from the parent tree.
To make sure they have the best possible chances you can use: willow
water, rooting hormone in powder form or liquid form or a Vitamin B-12 solution to wet the stem just before you plant it.
Many of the prunus family will do this. Most of the grafting of fruit trees is more about limiting size than it is about disease resistance when it comes to this family of trees.
Making sure the right nutrients and mycorhizzal fungi are present in the soil around the
roots is more important and will make sure the tree is healthy and thus able to fend off attacks by diseases and insects.
If you don't know how to make willow water, here is the recipe:
1 cup shredded willow inner bark, 1 gallon non chlorinated water (tap water that has been allowed to sit out in a
bucket for a day will work).
Place water in a pot large
enough to hold both the water and the bark, heat water to just before boiling, then turn off heat, add bark and stir.
(this can also be done cold but it takes three days of steeping with the cold method).
Let sit till cooled completely, strain off the supernate and store in a glass jug with a tight lid. Mix 1 cup to one gallon for proper dilution.
Redhawk