Like all orchids, Masdevallias and Draculas like clean water. Only distilled, rain water or reverse osmosis water should be used. If you examine their roots you will discover many fine hairs similar to root structures on Paphiopedilums. It is best to water these plants as they approach dryness. Thick, heavy-leafed plants prefer a little dryness at the roots. Thin soft-leafed varieties do not, unless there is heat stress as mentioned earlier.