Not sure if this is the correct part of the forum but I purchased a small greenhouse in May this year. I can't really afford to heat it and wondered what I might be able to overwinter. I have grown lupins and hollyocks from seed and have also taken cuttings from penstemmons that I plan to keep in the greenhouse over the winter. I live in the midlands in a suburban environment. I was planning to start annuals off early in the year but I really have no greenhouse experience. I have bought a book but in my view theres no better advice than that of gardeners so hope you can help re how early I can start annuals of what I can overwinter.