One of Britain's leading perennial nursery people introduces us to one of the most important perennial genera.

Rent video here

Rental for 30 days is $15 (£11-£12, €13-€14) through the Vimeo on Demand service. This requires that you sign up to Vimeo, but this is an absolutely minimal inconvenience (and they won’t bother you with marketing). Video length is usually around an hour.