A tank does solve the uneven-watering problem, and it introduces three others. What wicking actually is, where it works, and the weight nobody mentions.
A tray that overflows is worse than no tray. How to size one from your own runoff, and the two floor failures that happen without a drop ever spilling.
Water in equals water out, or water held. There is no third option, and deciding which one before you build is what keeps it off your floor and your wall.
No frequency works for a structure with a gradient in it. A three-zone routine that takes a few minutes and tells you whether the water went where you thought.
Crispy top, soggy bottom, and it is not your schedule. Four mechanisms stack in the same direction, and knowing which one you have decides the fix.
Leaving a vertical garden while on holiday? Why the top dries and the bottom drowns, which method suits which trip length, and when you need a person.