I usually prune tomato plants to a single leader or stem and then try to find ways to hang and support the plant as it continues to grow for as long in the season as possible. I have not been certain that this is the best approach, so this year I tried 5 different methods to control the plants, including letting multiple stems grow, and pruning the growing tip at the top of the polytunnel.
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Part of the Cloughjordan Ecovillage, Tipperary, Ireland http://www.thevillage.ie
MAG.MOE - The MAG, The MOE.