My 2 cents, Ron:

Any Nobile type Dends like a dry rest, as do other 'Calista' Dends. Right on
with Kenni's advice about superbum (anosmum); mine is on starvation right
now. Poor thing looks so sad, losing its leaves, but I know it's for the
best!

For most (most, not all! I cannot give you a total breakdown here!) hard
caned Dends, I cut down on water and fertilizer in winter, but do not dry
rest them.

HTH

Diana