Claude wrote:
Does anyone know whether or not coffee grounds are dangerous for the health
of plants or lawn? I heard once that they are sometimes used when turf is
laid, but at my place there is a suggestion that some plants are in
declining health because I emptied the contents of the plunger on them!


Cant vouch for this but

Coffee by-products can be used in the garden and farm as follows:

* Sprinkle used grounds around plants before rain or watering,
for a slow-release nitrogen.
* Add to compost piles to increase nitrogen balance. Coffee
filters and tea bags break down rapidly during composting.
* Dilute with water for a gentle, fast-acting liquid fertilizer.
Use about a half-pound can of wet grounds in a five-gallon bucket of
water; let sit outdoors to achieve ambient temperature.
* Mix into soil for houseplants or new vegetable beds.
* Encircle the base of the plant with a coffee and eggshell
barrier to repel pests.
* If you are into vermi-posting, feed a little bit to your worms
they will work better, be more alert stay awake and be on the
job longer.