On Thu, 5 Jul 2012 22:46:45 -0700 (PDT), Higgs Boson wrote:
I save coffee grounds from OP (along with my tea leaves) for roses and
other decorative plants. He says banana peels are also good for
roses.

Trying to save myself misdirected effort, what is NG opinion:

Need to scratch in and water coffee grounds? Or bury? Or just leave
on surface?

Toss 'em in the compost heap; add compost whenever you've got some and
it's the growing season.

Coffee grounds are fairly acidic... if you've got an acid soil, and are heavy
with the coffee grounds, you may actually push the pH too low for your plants.
Moderation in all things, except maybe compost. g

Roses are happiest with a pH of about 6.0 to 6.5.

Kay