Hi

My question is about having several small pots, and putting them in a
shallow plastic tray with water in it.

Is this OK?

Would it be a bad idea because the water would never be able to get up
from the tray through the soil to the roots?

Or would it be a bad idea because it would be like leaving the plants in
standing water?

Would it be better than leaving them completely without water if you're
going on holiday?

Sorry if this is a naive question.

Cheers

Jack