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Hello gohmos! Just saw your photo! So nice to see that this project was useful for you. You just made my day! Thank you!
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 ;)
Portable pvc vertical garden