I have posted on this under the Gruesome Slug Experiment thread - used coffee grounds definitely keep slugs and snails at bay, as well as being gritty it acts as a dehydrator - providing you create a big enough area around the plant to provide a barrier that the slippery little critters can't bridge - ie it must extend beyond overhanging leaves which isn't always easy at edges of raised beds. A work colleague uses it under his strawberries on his lottie and I have never seen such beautiful hole free strawbs.
Once it has been brewed the acid is leached out of the grounds, so although it is often recommended for improving soil for acid loving plants, it shouldn't make the soil overtly acid and it is nitrogen rich.
We have a coffee machine but in reality don't generate enough waste coffee grounds so I have been collecting waste grounds from a well known, high street coffee shop - who automatically bag their waste grounds and keep them in a bin in the store for customers to help themselves. I am gradually spreading it over my three (very small) raised veggie beds -I started with the plants most susceptible to slug attacks. I haven't found a problem with it growing mould once it is down as a mulch. Once I have covered the veggie beds I shall start adding it into the compost so best of both worlds.
Only downside - as I found last night - spreading it with bare hands results in a kind of henna stain effect for several hours!
Cathy |