In article ,
says...
The message
from Charlie Pridham contains these words:

If you do not anchor it the frame can flex in a high wind which will
break the glass, an unpredicted storm could be highly dangerous if it is
completely unsecured.

A predicted one can do just as much damage...


I got the impression the OP was not expecting high winds!!
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea