In article ,
Ernest Major wrote:
On 28/08/2018 10:23, David Hill wrote:
as has been said, plants do what ever they feel like.
I remember seeing a catalogue describing Silver Birch as an elegant tree
to 10 ft.
I think that often the writers don't want to frighten off potential
customers

Could almost have been a typo for 100 ft. (Wikipedia says exceptionally
to 31m/102ft, which looks like two rounds of conversion and rounding
from 100 ft.)

Almost certainly. And the books I looked it up in were the two most
authoritative texts of their day (not long ago), one botanical and
one horticultural. That's why I was puzzled.


Regards,
Nick Maclaren.