"before growing" is correct and can be used in written English.
For example, "Ethan was just a little boy before growing into a fine young man."
BEFORE growing up to become farmers, a startling number of America's rural kids are taught how to build rockets.
Do 3 sets of 15 push-ups, or as many as you can before growing fatigued.
Safin made it through the first set before growing exercised.
There's only so much one can do before growing exhausted.
Those suits were first brought by lower-profile players before growing to include bigger names.
Only if you believe our ancestors placed trading for sex before growing crops.
First Island, then Virgin, started almost at street level, before growing.
Mr Bakiyev himself had toppled a corrupt, authoritarian Soviet-era president before growing corrupt and authoritarian himself.
During the day, Mr. Kurniawan's civets slept inside their small wooden cages before growing active at dusk.
It shrank by a much smaller 0.7 percent in the second quarter before growing 2.2 percent in the third.
Kuwait's economy contracted by 41% during the Gulf War of 1991, before growing by over 50% in the subsequent year.
