Basicly you simply modify a used plastic peanut butter jar to hold a plant of your choice.
The green aspect?
1. You have a plant and you are keeping it alive, thats what green is all about right?
2. You are reusing a plastic bottle so if 1 isn't green enough for you this should be.
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Now lets get on to the building
Step 1: What you need.
1. A jar of peanut butter
2. You will get here after you and some friends or family decides to eat all
3. You need some soil for the plant
4. Obviously you need the plant itself (i chose what i think is a jade)
5. Some rocks
6. Either a nail or a drill