[header] How to make a plastic sheet greenhouse [title] String up a clothesline between two bare trees, tightly, about head-high. [title] Drape a clear plastic sheet over the clothesline. [step] A standard 9'x12' size works okay, but for more space the bigger the better.
Clip it with clothes pins to keep it in place. [title] Spread out the sides like an old army pup-tent and fasten them to the ground with rocks or bricks.