MJ is correct....cut the old spike. At the base of the pseudobulbs is a small "node" which will develop into a new pseudobulb and from this will grow a new flower spike. Sometimes the you will get a flower sheath and inside is the flower and sometimes they grow flowers without a sheath and sometimes the sheath will be empty. You can see the open sheath on the 1st pic. The 2nd pic just grew a spike without a sheath. While the 3rd pic isn't my best, it demonstrates a node that I trust will become a new pseudobulb. The last pic is a developing PB....
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