I planted 48 impatiens and 16 coleus all around the ponds and creek this weekend. Wouldn't you know it....it was COLD this morning. Frost on my car. I checked the impatiens this morning.....they looked OK, but are they really? How much cold can they take before they die? I am hoping that enough heat was reflected off the pond surface so that maybe they were protected. I guess I should have waited a bit before planting them.