06-09-2012, 11:19 AM
I can think of two possibilities:
1) You didn't clean the stuff well enough.
2) Your atmosphere is dry, so the topmost part of the column of LECA in the pot is literally "sucking" water from the roots.
If the top looks dry, there are a number of things you can try: 1) water more often, to keep it moist, 2) mist it periodically, 3) loosely cover the top of the pot around the plant with plastic wrap or foil, to slow the evaporation rate, 4) put a layer of sphagnum on top.
Once the roots penetrate the LECA and grow downward, it should be no issue.
Using science and logic
to advance orchid growing