How Big Should Hole Be In Bottom Of Pot For Upside Down Plant?

Question

N NE 4th floor corner balcony top of building. glass & aluminum post railing.

Answer 1

This will depend, completely, on the plants that you intend to plant.

Usually about 3 inches will be enough for almost anything, but can be too large for smaller plants.

Here is an article that will offer some information: https://www.gardeningknowhow.com/special/containers/upside-down-gardening.htm