My database resources indicate that the double weeping cherry does reach about 20 to 30 feet at maturity. While growing conditions will affect final size and growth rate, and while pruning may be used to maintain any woody ornamental plant at a lower size if you want the plant to stay in the 10 to 12 foot range that will probably not be possible. I suggest you leave the tree for a while and try pruning to control size. Then be ready at some point to replace it with another plant that will stay closer to your desired height, perhaps a semidwarf type crape myrtle.
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