Would putting coffee grounds in the soil of a mint plant help the plant grow faster? Or damage the plant?

Question

If I put two teaspons of coffee grounds in the soil of a mint plant, will it help that plant grow faster or, just as importantly, hinder the plant from growing at a regular rate?

Answer 1

I'm sure it will not hurt the plant.  Coffee grounds could actually help by increasing the organic matter content of the soil and act as a mulch to increase the moisture-holding properties of the soil.  The caffeine may actually deter some insects from bothering your plant.

Answer 2

Probably help it because of acidity.  When I was in high school many years ago I worked for a mint grower in southern Wisconsin.  The fields were peat ("muck" in the US) which is very acidic.

Watch out where you grow the mint.  If in a pot, OK.  But if you put it in the wrong part of your garden it will spread very aggressively.