Tom, sorry but I cant serve to you with exact dates. I'm an indoor grower I'm unable to give my plants different conditions and all my plants have to adapt up to a certain degree my conditions. I grow them only in different rooms :
- Subg. Polyantha - in the living room behind west facing windows
- Subg. Paphiopedilum - the smaller ones in the kitchen behind an east facing window (henryanum, charlesworthii etc.)
- the bigger ones in the dining room behind a west facing window ( villosum, insigne, hirsutissimum etc.) in winter this room si slightly cooler.
- Subg. Sigmatopetalum - here in my study/computer room (also P. purpuratum)
I reported here about my inorganic
potting medium already before ... but after some reported here about good success with rockwool cubes in the past I also gave it a try with some plants. P. purpuratum is one of them.
I water all my Paphs every mor or less 3 weeks ..... even 4 weeks are possible. This helps me to travel from time to time without the need of help of other persons to care about my plants.