The Vanda vases don't need to be tall; they just need to hold the roots without breaking. Perriera (or whatever it is now) Bangkok Sunset is a much smaller plant with smaller flowers than the big Vandas.
When you soak the roots they turn from light silvery white or tan to a much darker color. With fresh white roots they turn green. Older roots turn from light tan to dark tan. If they've dried out too much it can take a long time to turn from white to green. If this is happening consider soaking them longer, like overnight. My experience has been they do fine so long as they don't soak for more than 24 hours. Your goal is to make sure all the leaves are smooth, with no fine linear wrinkles. You might need to use a magnifying glass to look for these if your near vision isn't good.
Vanda seedlings - actually, all Vandas - should grow steadily through the year if temperatures and water are appropriate. They produce one leaf after another. You should expect at least 3-4 leaves a year on everything from seedlings to mature plants.
They require a large amount of fertilizer or they just sit there. Are you fertilizing your Vandas, including the seedlings?
Motes has written that he used 1 tablespoon of 20-20-20 per gallon of water for fertilizing his Vandas, at every fifth watering. He has since switched to using MSU at this dilution. I get good results with either at these high concentrations.
Are you growing your Oncidiums in LECA in S/H, or in pots with regular holes? In typical household temperatures they grow all year. Maybe you're not watering enough? Are you fertilizing them?
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