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This is a discussion on Humidity for Orchids within the New Growers: Ask the Senior Members forums, part of the New Growers category; Sometime ago before I was a hardcore orchid grower, milk was amongst some advice I ...
Sometime ago before I was a hardcore orchid grower, milk was amongst some advice I recieved for using methods to treat root rot casualties. A phal infact! It acts as a natural fungicide due to the enzymes present. Always used it since.
Superthrive despite the endless reviews, debates is a root hormone/ plant tonic and very strong. This is the first year I have used it. I cant comment against it but remain sceptical at the moment. One majority opinion of it is its tendency to deform bloom/ flowers if too much is used. To be honest I have tried some other specialist rooting hormones this year with the nat.acid and butyl acid content and neither 3 of the products in this paragraph have had much to write home about. Seaweed extract is long winning my vote as a general tonic and root stimulant and can observe the response i got from my plants and it far outweighs the success of the previous 3 products...IMO by far! I would reduce the use of superthrive due to its high concentration.
If you find the tap water has negative effects such as leaf yellowing try dechlorinator product for fish aqaauriums or leave the tap water to stand in the open for 48 hrs to allow evaporation to alter the chemistry. Dont know much on r.osmosis and the only reason I favour rainwater is because of some carnivorous and tillandsia plants i have growing amongst the tropics and these hate tap water and soon decline. Dont think I would be overly concerned if it wre just orchids, they are pretty tough.
To encourage roots try a temporary dry spell to induce the orchids to respond to the instinct need of a search for moisture. Halt fertiliser at this time. Varying methods around for root issues.
IMHO, misting does little to help orchids. The effects are very temporary and it can cause all sorts of problems if overdone. Orchids seem to be able to adapt to their conditions as long as the conditions are consistent. Misting, which may raise the humidity on a short term basis, does exactly the opposite. I think your pebble system should provide enough humidity if the other conditions needed to grow your orchids are met light, water quality, fertilizer, air movement, etc). Unless your environment is very dry, like a wood burning stove, grouping your orchids in one spot will also help give them enough humidity.