Dendrobium cuthbersonii in chilled water
2 month ago I got a couple of D cuthbersonii from Golden Gate Orchids. They each had a couple of flowers which they eventually lost. One is developing a new flower which is a good sign, both have lost a couple of leaves and neither is showing any signs of growth. The good news is they are still alive, the bad news is that I don't see any new growth yet.
They are in a tray of RO water bumped up to a ppm of 170 to 200 with fertilizer. They are in a cool greenhouse with plenty of air circulation. Today I put the finishing touches on a small refrigeration system which will chill the water they are sitting in.
From Ebay I got a 'Coca Cola Fridge', a small cooling box suitable for a small load of drinks. It cost $20 oplus $10 for transportation. A plastic bottle sits in there and is fed by a hose attached to an aquarium pump, the smallest they have. The water overflows into another pipe and is returned to the tray the plants sit in. The 2 pipes prevent proper closure of the fridge door so the opening is wrapped with Aluminum foil from the kitchen.
There is constant circulation and the end result is that the water in the tray should be substantially cooler than the water the rest of the plants sit in and get watered with. I will check temperatures tomorrow. I remember reading somewhere that these plants like to have their roots bathed in cold water, any comments would be appreciated.