this is a portable greenhouse, good for start seeds or small vegetable growing (basil, parsley, salad, cylantro...).
you can move it in the better site of the garden in every seaon, or bring it with you in holiday.
is really really fast and easy to built, and super economic and ecologic, I made mine all out of scraps and in little more than an hour.
1.big plastic can (white is better couse allowed more light in the inside of it);
2.transparent or semi transparent plastic sheet;
3.4 screw with 4 nuts;
4.4 little piece of plywood abuot an inch by an inch;
5.a piece of bike innertube;
7.a slat (long like the can).
Step 1: CUT HOLE IN THE CAN
Step 2: MAKE HOLE IN THE BOTTOM FOR WATER TO DRAIN
Step 3: MAKE HANDLE
Step 4: PUT PLASTIC SHEET ON CAN
fix one side to the upper part of the square holes (with screws, nuts, small square of plywood and innertube).
on the other side wrap a slat (fix it with ducktape) so will keep the sheet down.