Daniel Hanna wrote:

I've been using fish emulsion this season, Shiva, and the roses do seem
to like it. But I've also been using seaweed fertiliser too. It's a
root stimulant that really seems to work wonders on the blooms
indirectly - thicker stems and longer lasting blooms all round.

Hmmm. Seaweed, eh? Between that and what Hillman used to call "liquid
fish" I can have an olfactory Day at the Beach. That lasts much more than
a day! Have you got a brand of seaweed you like? I have actually never
seen this stuff here.