Posted: 04/08/2014 at 17:10
Everything you have mentioned would be fine in the greenhouse. I dont heat mine and use it to over winter cuttings, early seed sowing, protecting slightly tender plants.
It is not just the higher temps. that help, but the protection from wind and rain, which is what kills many plants outside.
I start my hardy annuals in late Feb. / early March, but I also sow some in Autumn and then over winter, and some perennials get sown in winter in the greenhouse. In particular this seems to work very well for Himalayan poppies.