Answer: Indeterminate plants can grow as large as 8 feet, however in the limited root space of a container they generally do not get that large -- the growth slows a bit once they begin to bear a crop. There is no harm to letting them trail a bit as long as the stakes are strong. To limit the weight you may want to prune out suckers. Many container gardeners find a trellis system helpful, using fencing or other sturdy support to tie up the tomatoes (a vine covered with fruit becomes quite heavy.) This should be securely anchored however because a trellis covered with tomato vine can work like a sail and catch the wind. Good luck with your tomato crop!
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