On a cold morning, if you can think anything beyond "I'm cold", you may have noticed that frost doesn't form very much in areas underneath large trees. Why is that? First, what is frost?

How does this happen? Frost and ice form when the temperature falls below freezing – that’s less than 0 degrees Celsius. For water to become a solid, like the frozen puddles in your street ...

We know that the first frost is an important date ... When water gets below 32 degrees, ice crystals that form inside tender plants will rupture the cells and, effectively, kill it.