Put them in whenever you feel like it. BTW, plants like tealeaves too. I keep a cup on my counter that I empty my used tealeaves and then throw them out in the garden.

Also, Starbucks keeps their grounds for anyone who asks for them. They call them grounds for gardens. Thing is, there are only so many Starbucks and so many gardners, so mathematically that means......we need more gardners to keep up with all the Starbucks openings. Maybe Starbucks could deliver them by the quarter yard and just dump them directly on our lawns..What do you think?

Why are coffee grounds good for plants? Do you just take the grounds from your coffee maker and place them at base of the plants? What is considered too much?