I have a big area of banky dry and rough ground that I really do not have
the time or energy to do much with so I am thinking of letting
nasturtiums run riot. Any recommendations as to what variety I should use
to best coverage and effect ?

Kate

As well as the annual plants, you could always try a perennial Tropaeolum
such as polyphyllum. If it's happy it will come up each year and spread
around. I would, however, warn against Tropaeolum ciliatum which is quite
liable to become very invasive, and is almost impossible to kill.

Thank you all very much for your interest and ideas, I think I will go for
the nasturtiums this year for a quick coverage but I do like the idea of
prostrate rosemary, the area is sunny and well drained. I don't know the
polyphyllum, it looks good and cheerful, I have room for all :-) thanks
again

kate