There are many different kinds of hydrangeas. Ours are all about 5
years old and only the Oak Leaf Hydrangea attempt such heights. The
mopheads and lacecaps are content well shy of 6 ft. The second year
they were as tall as they ever got. Some grow new wood each year, some
keep old wood. None are identical and few are ever 6 ft. One we don't
grow is Paniculata and it will grow 15 foot tall, so it would probably
pass 6 feet in one year. Another we don't grow is the climbing
hydrangea that gets up to 80 feet tall. It probably would surpass 6 feet
in one year.
The USNA has a good hydrangea site:
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