I use time-release fertilizer as a "boost" for orchids that need more than the light fertilizing that I give the whole collection with liquid fertilizer. This especially for those that grow a lot (making lots of new plant tissue) during the growing season, especially Cymbidiums and Catasetinae. Helpful for the larger Catts too. You can use it for Vandas if you can "contain" it so that when watered the extracted fertilizer can drip over the (mostly) bare roots. There are little "cages" that can be purchased or you can wrap some up in a piece of nylon from pantyhose. But for most of my orchids, I just use the dilute liquid fertilizer, they don't need much. And time-release as a supplement for those that do need more.
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