Step 5Tie it up
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Now use the clothesline (or whatever you've decided to use, just make sure it can withstand the weight of the plant and the wet soil, so, medium duty nylon rope would work or even a light duty chain) to lace through the hole so you have 2 loops coming out of the top. This will keep the top from coming off but still allows you to lift it for watering. I joined the 2 loose ends with several tie-wraps on the side so it wasn't under as much stress as it would be if it was butted in the loop. This gave me loops about 3' long (you can adjust the length to fit your application.
Before anybody starts flaming me or calling the cops, the roadsigns in the background were all legally obtained. The state of Missouri switched to aluminum signs and all of the old steel signs went to scrap.