Posted: 25/11/2016 at 18:07
I have grown Petunias, Gazanias and Cosmos. I sow in heated propagators in March, indoors on a window sill if still too cold. Then I pot them on into the GH which is heated with a small electric heater, a heating cable in sand and a heated mat on a shelf. I find Gazanias are slow to take off.
Cosmos must be pinched out to stop them going tall and leggy and to make them bushier.
I find they germinate well in a heated propagator but they can't stay there too long once they've germinated so you need somewhere light and frost free to keep them. If I hadn't any heating in my GH I would sow them later.
Last edited: 25 November 2016 18:09:18