Christopher Hollinshead asked:
> 1. In this particular instance, what are the pros and cons for clay pots
> verses plastic pots?
I've used both successfully. Clay is more durable. Plastic is lighter weight.
I'd be more concerned about using only a 6" pot for that long. When I've
planted TBs in 6" pots like you propose, they were already rootbound when
transplanted a little over two months later.
> 2. What would be YOUR recommendation for the potting mixture
> composition? (obviously one criteria should be good/excellent drainage)
> The back of Schreiners 1996 catalogue gives a potting mixture of 45%
> firbark, 20% pumice and 35% peat moss. What about a mix of vermiculite
> and perlite and peat moss?
I found that 100% potting soil induced rot, but a half-and-half mixture of
potting soil and sandy garden soil has worked well.
> 3. I am also considering storing the potted iris over the winter in a
> basement cold room that I have. It would be warmer there than the garage
> and they would probably not freeze(but close to it-low 30 degrees F-high
> 20's) This room is in total darkness most of the time, but then so is
> the garage. Anybody got any thoughts on this?
Cold and dark didn't work for me. A cold room has definitely worked better
than a heated one, but setting up grolights on timers was the real key.
Sharon McAllister (email@example.com)
Mississauga, Ontario Canada zone6b
Director, Canadian Iris Society
Newsletter Editor, Canadian Iris Society