"K" wrote
I don't know pelargonium types. But I have one with soft round leaves with
black marks and lurid pink flowers, and that is flowering its socks off.

A Zonal Pel from the description and the easiest to flower, in fact it's
difficult to stop them. :-)

But two of the sort of crisp leaf type, Voodoo and Lord Bute, are not
flowering at all well. I've had a few flowers on Voodoo, but Lord Bute
hasn't produced a single flower, while still otherwise looking green and
healthy.

Voodoo is a "Unique " Pel and should flower through the summer, on and off,
I found they tended to flower and rest, flower and rest
etc........throughout the growing season.
Lord Bute, on of my favourites, is a "Regal" Pel and should also flower
through the summer. It will not be as floriferous as a zonal (but classier
IMO) and the flowers get easily damaged by rain especially if you don't use
the right fertilizer.

Both these types are more difficult than the usual Zonals, they retain their
liking for a free draining compost (John Innes 1 with added sand) and can
cope with drought better than overwatering.
They have a requirement for more potassium than the other types of pels, so
use a Tomato fertilizer on them only.


Anyone else had problems this year?

No, but now I don't grow any other pels than the old zonal "Mrs Doris
Moore".

--
Regards
Bob Hobden
just W. of London