Question: DO I need to cut the Stem back of an orchid after the petals have fallen off?
Answer: I am going to guess you have a Phalanopsis type because these are very popular. Trim just below the flower, cutting just above the next node or joint on the stem. With luck, it will bloom again from the same stem.
Q&A Library Searching Tips
When singular and plural spellings differ, as in peony and peonies, try both.