Following on from my indignant reaction to the "shallow root system = a tree's ability to hold out in freezing temperatures" statement.
So here is the skinny on how cold dormancy works, i.e. what a deciduous (in this country, used to refer to trees that shed their leaves in winter) tree does to prepare itself for winter beddy-byes.
Actually cold dormancy; the process by which a deciduous tree prepares itself for winter is quite an interesting topic in a geeky sort of way.
Its starts with the absorption of chlorophylls which exposes the autumn colours we are familiar with. Then as nutrients are absorbed a whole range of other processes begin including cell wall hardening and increase in respiration as sugars are stored around the plant. It would seem that the tree has shut down initially but far from it. Then as daylight and temperature decrease there appears to be a timing mechanism that prevents the tree from emerging from winter too early. It would be disastrous for the plant to produce leaf just to be lost to a frost so the tree needs a degree of certainty that this is not going to happen. So a substance in bark and stems called phytochrome detects light levels, as these increase along with soil temperature and as long as at least 300 hours of low temperatures has passed, the tree will emerge in Spring. Amazing stuff.
There. Before anyone else starts spewing a whole load of crap.
Thanks to bonsaibanter who is a fantastic source for horticultural facts. (Get the hint? Keyword = FACTS.)