I missed this post and I posted about the coffee that worked great for me.
I had a serious problem. The coffee is used in the spring when we have our biggest rain period just as the hostas are waking up. Then I put another coffee treatment after they are up. I do not have one bite.
This if fresh coffee not used coffee as said the caffeine is gone and not affective if you use Starbucks used grinds.
I do not drink coffee it is free for me from the hotel when I travel so it is a good method for me. Someone that drink coffee and buy it for their morning fix it might not be a good idea but it has been very effective for me.