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Help!! Size of seedling trays?

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Help! I`m running out of room underneath my fluorescent lamp, and it`s 
time to move 40 onion seedlings out of the 2 margarine tubs and into 
their own individual spaces. 

What size of tray or container is big enough?

Right now I have 2 different types of tray:
- 1.5 inches by 1.5 inches across, by 2 inches deep;
- 2.5 inches by 2.5 inches across, by 2 inches deep.

Is 2 inches deep enough for a plant to grow properly? I currently have 
some broccoli, cauliflower, swiss chard, and onions in the 2-inch deep 
trays.  Will this be deep enough? Even when I first transplanted them 
to these containers, their roots were already long enough to go down 
the full 2 inches.  

And how wide across should they be? I prefer the 1.5 by 1.5 across, 
because they`re so much more space-efficient.  But will that be wide 
enough?

I have to buy some trays for the 40 soon-to-be-transplanted onions, 
but I`ll wait until I get some advice here as to what kind to buy.

I`d imagine that the depth would be more important than the width 
across.

Incidentally, some of my transplants are in peat moss cups, and I find 
these are too much hassle -- they`re falling apart, a white fungus is 
growing on the outside of the cups, and they take up too much room.

Thank you thank you thank you! for any help you can offer.

--Lisa in Ottawa


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