Answer: This is a potentially huge vine and it does become very heavy in the course of a season. It grows by wrapping itself around a support rather than with holdfasts or tendrils. If it wraps itself around a gutter, for instance, it could potentially pull it down with its sheer weight.
It will bloom on the new growth of the season, so you may trim it back as short as needed, with the shortest being about two or three feet tall, early each spring, if desired.
On the other hand, it is not necessary to trim it back at all if it is planted in an area where it may spread. Incidentally, thirty feet is not an unusual size for this vine.
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