I'm just back from the nursery with 3 Alcea Charter's Double's in white. I didn't realise they were hollyhocks until I looked online. The pictures look amazing.
Unfortunatly, there's a bit too much conflicting info online - drought tolerant, keep moist, full sun, shady site all mentioned!
So I'm going to put them where I think they will look nice and hope for the best! It is quite a dry site - sheltered from rain by trees but stays dry when watered. It will have sun/part sun almost all day and it will live behind a peonae and hydrangea (which is still quite small, one or the other may need moving in a few years).