In September I took several cuttings of pelargonium 'Clorinda' and they've been sitting happily in a sand/compost mix, under glass, over the winter. They are green and healthy looking, with most making new leaf growth.
I've just been to pot them on, only to find that almost all of them have no discernible roots. Below the surface, they look exactly as they did when I took them in September. How can cuttings be making healthy top growth with no roots? Any thoughts gratefully received!