In article . com,
"DavePoole Torquay" writes:
|
| It would be Buddleia globosa. ... If it is
| to be cut back, pruning must be carried out immediately the flowers
| start to fade since they are carried on the previous year's wood and a
| spring pruning can reduce or prevent flowering for that year. The more
| common Buddleias flower on current season's growth so they can be
| severely cut back in spring without risk of losing and flowers.

My experience is that, as with quite a few plants like that (including
many clematis), "must" is wrong - "should" is right. When I cut my
B. globosa (and B. alternifolia) back hard in spring, they flowered
much later than usual, but still flowered that year. I.e. the wood
needs to be of a certain ripeness more than it needs to overwinter.

However, I didn't do it regularly, and it is quite likely that it
would work only on some plants and in some years. I did do that
regularly for Clematis "henryii", and have seen evidence of the
phenomenon with C. montana.


Regards,
Nick Maclaren.