Experts and BHG readers answer.
weeping cherry tree care
The dead branches can be taken out anytime. Otherwise, prune your weeping cherry in winter. Remove no more than one-third of the living canopy annually; and even that much is pretty aggressive for a cherry. Add a 3-4-inch layer of organic mulch (shredded cedar or cypress, for example) around the base of the tree, clear out to the dripline. The mulch may ease competition stress (from turf) and promote blooms.