tree bands and screen

Thu, 19 Nov 2015 14:41:02 PST
>The roots will self-prune at the soil-screen junction. Once in a while a
few roots will go through the screen but only when the bulb has pulled
itself very deep into the pot. 

My main concern, I guess, is with the perched water table. The pots are sitting in a flat. If the perched water table is a fixed depth regardless of pot size, say 1 cm, and the pots are 8 cm deep, then, allowing for some space at the top of the pot, the roots can only grow 6 cm long before they reach the saturated perched water table. 
Screen exacerbates this condition. 
The tree bands are 12 cm high and I noticed that seedlings (oncocyclus iris) revived when transplanted into the pots. 

Of course, trying to raise oncocyclus iris seedlings in the upstairs bedroom under lights is possibly one of the dumbest ideas I’ve had in a long time. (Not counting trying to figure out why a bulbs of Galanthus elwesii var. monostictus wasn’t up yet, just a week it will never be up.) 
I think the irises should have been planted out in the garden this summer. 

Bob Nold, 
Denver, Colorado, USA
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