These plants frequently will send up more bloom from nodes along the spike. Only remove the spike when it turns brown and woody. New spikes will arise from the base of the plant and will sometimes look like new roots at first. Unless you have lots of space for the spikes to droop naturally, be sure to keep them securely staked. It is heartbreaking to have a bloom-laden spike accidentally broken by careless watering or playfull pets.
Dendrobiums send their spikes from the tips of the new-growth canes.
New canes will emerge from the base of the plant and the older ones will die back. Often the older canes will produce new plantlets, called kikkys. When these bonus babies have good root growth they can be potted up for gifts or to add to your collection. Some types of Dendrobium will kikky all over and each one will bloom. If you find yourself with one of these, leave them on the momma plant to create a real conversation piece.