I was at a greenhouse today and the guys were transplanting knockout roses. They were in something similar to AJ's nine ounce cups, only wider and shorter. What was odd was they had their bottom cut out. They set in something like AJ's grow rack, only it was made of material similar to corrugated cardboard. He would fill a 3-gallon container about half full of potting soil, take the small cup, turn it sort of sideways and push on the bottom. Obviously, the plants were sort of root bound, because the soil did not come loose. He then stuck it on top of the other soil and nearly filled the container with more soil. Tamped it slightly and was done.
What was strange was the plants looked like they had been overwintered. Only three or four branches, none longer than 2.5 inches.
I wish I could take a couple of days a week off for the next month and volunteer to work for him.
FWIW, and this goes against what almost everyone here says - a 3-inch square container (about four inches deep) is large enough to support a 12" plant. His reason for doing it this way - he needs to conserve space and he sells hundreds and hundreds of plants each spring and simply doesn't have room for five-six inch containers if they don't need to be that big. I know last year my sister brought me a 132 seed tray that holds tobacco plants. Each cell is only one inch square by two inches deep, with tapered walls in each cell. The plants were 12" high or taller and except for needing watered at least every other day, had no trouble growing.
YMMV,
Mike
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