The stage at which you remove the growing tip of a tall variety depends on whether you are growing outside or in a greenhouse. You might allow four trusses outdoors and up to seven or eight in an unheated greenhouse.
The photo on the right shows what happens if you don't pinch out the growing tips! Thanks to Ted S. for the photo.
The other factor to consider is the length of your growing season which for the purposes of the above example would be from late May to the beginning of October of a frost-free period. The longer your growing season, the more trusses you can grow before you pinch out the growing tips, assuming that you have a tall enough greenhouse!
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