| I am not qualified to make any comments here.
But I can tell you about my experience with a few orchids set inside an 'empty' fish tank( aquarium), 24"x 12" x 18". I had gravel at the bottom and some wood bark on top of it and had 2 phals and 2 dendrobiums ( all 4 in pots) in it.
I used 2x20 watts plant lights in a canopy, raised above the top of the tank by placing 2x4 wood inserts.
The plants did not do well at all and the leaves started to drop off. It may be because of lack of aeration , the importance of which I found out here in this forum.
There may have been other reasons for the plants to have fared poorly. Since I was (and still am) new I have no way of concluding that lack of aeration was the culprit.
If the jar is shaped liked an inverted pyramid or if it is 'French" type it may be better, I think. may be 6" opening may be sufficient if other experienced people say so.
Good Luck |