I adore single hollyhocks; not the doubles that look like pom-poms. I especially like the creamy/greenish dusky old pink ones. At, possibly Hampton Court Flower Show last year,I asked a vendor of Hollyhocks for this colour and he explained that hollyhocks are very difficult to sell by colour, they get pollinated across the colours as far as I understand. BUT I heard that one can take cuttings that will 'come true'. Does anyone know about this, with instructions please.