Watering is a balance between ambient temperature, humidity and how much the gardener waters.
In warm temperatures Cattleya seedlings grow rapidly (for something that small) and water evaporates faster from the medium. Under these circumstances Catt seedling can use a large amount of water. With temperatures in the 80s F / upper 30s C I can completely soak the sphagnum around my seedlings and know they will use it rapidly. I struggled with Cattleya seedlings in medium to large bark because they would suffer badly when I missed one day of watering.
As ambient temperatures cool such seedlings use less water. The gardener needs to pay attention to the seedlings. I have observed healthy Cattleya seedlings in warm conditions use more water than other kinds of orchids use.
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