With the warmer weather this past weekend I notice tulip tips popping through my balcony containers (north exposure). The weekend weather was an average of 62F here and today it's only 28F. Will they survive?? I'm a bit worried. About the gardening zone, I'm in Niagara Falls, Ontario and I THINK the gardening zone map shows zone 6b or 7 but haven't confirmed. I'll do that soon. In the meantime if anyone else is in area do you have ewperience planting bulbs, TIA.