Are you saying that you water once a week? Vandas usually need to be watered more often than that. I water mine almost every morning but every other day would be alright also. I probably wouldn't use bloom and blossom on vandas. They grow continuously, even when they're blooming. I think bloom and blossom is more appropriate for orchids that have a growing season and a blooming season. I've also read that you want to face vandas so that the flat side faces the light. In other words the leaves should point perpendicular to the light. Just suggestions. Good luck.
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