Just received 4 hollyhocks about 4 inches tall when should I plant them out?
If they have a decent root system Gill, yes. I've just planted about 20 in clients gardens. The root system needs to quite visible at the edge of the pot. Mine were in 9cm pots, so it depends on what pot size they came in really. If they're still small I'd grow them on a bit first. If we get early frost I'd pop them in a cold frame till next spring and plant them out then.
Thanks that's very helpful.