When pruning dead or diseased nodes, make sure to cut it down to the base or right above the healthy, green growth. Cut lower if the stem interior isn't white. Cut the node.

Submerge the entire flower—stems, blooms, and all—in a sink or container of clean, cool water. Keep the rose submerged for at least 30 minutes. Severely wilted roses may need more time. Wash the vase ...