Re: warming up for the winter
old black colored cloths, small plastic golf plates , turf blocks, bricks or wood heavily painted with charcoal and then plastic over it.
Charcoal really attract a lot of heat from sunlight, cover it with some plastic or it will wash off with rain.
old towels, leaf mulch, pine leaf mulch, coil a rope around the stem or trunk, plastic bags, bio degradable black painting materials.
Reed that has become dryed and browned with autumn is a good insulator, it still got's alot of cellulose in the leafs and stem. if you mix it with hay or any other mulch it will retain its heat well.
if you live in a cold zone consider to paint your fence on the southside black.
wool or a wooly material mixed with black cotton strips and the sprayed with silicon spray or any other waterproof spray.
alcoholic gel prevent surface freezing on trunk leaves or any other material if you use any plastics consider to paint it with cheap alcoholic gel. Alcoholic gell mixed with with coconut oil makes a waxy protective layer which also keeps micro organisms at bay.
I put coconut oil on the trunks of my palms and it certainly helped, not only against fungus but also against any moisture / in the air.
christmas light can be effective but also can cause fire .
There are many more alternatives : low wattage lights , infared lights etc.
mulch the ground with pine mulch or leaf mulch, lay a black plastic foil over it and then cover it loosely with black mulch .
let black stones warm up in the sun and when sun fades cover it with thick plastic so it retains it heat but still loose moisture.
Lavastones are perfect insulators and heats up well in sunlight and also promote air circulation.
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