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Hi there! Generally speaking Lobelia is much tougher than Petunias. I work in a nursery and our Lobelia in under glass with no heat but is fleeced at night and the petunias are kept in a heated area at about 14 degrees. On saying that, the night times temperatures seem to be much milder now. You could always bring them in if it looked like it was going to be really chilly.Is your greenhouse insulated?Hope this helps.Susie :)