this is a tricky subject... plants with green roots (ie Phalaenopsis,
Vanda) may be benefited by this. However you should know, that clear
pots allow algae to grow on the roots, disabling them. Vanillas are
happier when their root system is humid, dark and cool. They may be
climbers, but they beggin their life in the soil, so I wouldn t even
think about it. A good moulching will do wonders for your vanilla.
That Laeliocattleya of yours must have been a late bloomer (joke).