| What do you mean by the "stalks"?
Flower spikes (flower stems) should be cut off near the base after all the flowers have dropped off.
Or do you mean the pseudobulb (a bulb-like growth with one or two leaves at the top and a set of leaves near the bottom)? Don't cut that off! That's the only way the plant can grow and produce future pbulbs--from the old existing ones. Newer pbulbs can give you more flowers.
Onc. Sharry Baby is one of the easiest and most popular oncidiums, they are great for beginners! Easy to rebloom if you give it enough light--mine bloomed once this year.
Orchids may put out new growth (growth period) or just sit there doing nothing (you can call it dormant if you want). Oncs don't actually get "dormant", they don't lose their leaves or anything. Of course, water! Oncidiums need water all throughout their lives, and if you don't water for a whole winter, it's going to die of dryness. Just water less, keeping slightly on the dry side when the onc isn't growing.
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~~Lily~~
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