Choose a ripe plum and remove the pit
Wash off all fruit flesh from the pit
Dry the pit for a day or two
Crack the hard shell carefully to remove the seed, if possible
Place the seed in a damp paper towel or moist peat moss
Seal it in a plastic bag or container
Refrigerate it for 8 to 12 weeks for cold stratification
Check occasionally to keep it slightly moist
Plant the seed in a pot with well-draining soil after stratification
Place it about 1 to 2 inches deep
Water lightly and keep the soil moist, not soggy
Put the pot in a warm, sunny location
Wait for germination
Transplant the seedling outdoors after it is strong and the weather is suitable
Choose a sunny spot with well-drained soil
Space it properly from other trees
Water regularly during the first growing season
Protect the young tree from pests, frost, and animals
Prune as needed to shape the tree
Be patient, since fruiting may take several years