I used 3 cups of TT in each box whether I had 1 or 2 plants in them. I mixed 1 cup into the potting mix and poured the other two cups into a strip on top of the mix. Whether this is the best thing to do, I don't know, but it seemed to work fine for me.
It was interesting at the end of the season when I removed the plastic mulch. Where the fertilizer strip had been, was now a solid mass of tiny fibrous roots, like they had congregated there and completely consumed the fertilizer.
Incidentally, one of the local garden centers here had an inventory reduction sale last week, so I got five 5 lb bags of TT and the Espoma Garden Lime for $2.48/bag. I thought that was a pretty good deal.
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