Following Bob Flowerdew's comments on his experiments on storing water in greenhouses to regulate temperatures on GQT, this is the second winter I have emptied a couple of full size plastic bins of compost and placed them in my two greenhouses, and filled them with water and replaced the lids. It seemed to work last winter, I lost hardly any tender plants and not using bubble plastic I could ventilate them properly when needed. But we barely had a winter down here in reality. What will really test them is this Arctic winter we keep hearing is heading our way. The most finicky thing still in one greenhouse is my much coveted Uncarina, a cold and damp hater from Madagascar, and though my wife hates it because it looks tatty and is nothing more then a large twig in winter, once the leaves go it will have to come in and be forgotten about until next May, when it will resurrect into a handsome plant again. Let's see how the rest get on, Mr Flowerdew says this does work for him, and his winters are proper Norfolk ones, not these soggy non-starter efforts we have here in Wales.