John L wrote:
My wife likes to save all tea left in the pot and give it to the
houseplants. Is it really any good for them?

There are certain plants that I know people swear by feeding them tea.
Camelia, I think, is possibly the main one I'm thinking of. But I'm
not sure if it's any good for houseplants or not.

I used to feed the dregs of my (black) coffee to tomato plants around my
desk at work. They were nice buzzy tomato fruits. :-)