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Sorry for the late answer! Yes, you are right. What I did to solve that problem was putting the end of a plastic bottle in the bottom, so the water drains to that bottle. It holds with a screw. So after i water the plants, the excessive water goes to this container and after a while i take it off and use that water in other plants. Its not the best solution i know..but i think it solves the problem ;)
Hello gohmos! Just saw your photo! So nice to see that this project was useful for you. You just made my day! Thank you!
Portable pvc vertical garden