They would not grow well and be stunned, the plant would run into issues of nutrition and start to starve, self cannibalize what it can from lower growth and put it all into the flower as its soul purpose is to reproduce. It is also a massive stress on the plant and chances are it would hermi just to make seeds if it had the available resources to from pollen.
Its not an ideal thing. even underfeeding is a better option if its available. IDK why your asking this question but I would try and avoid that as much as possible.
Good Luck!
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