I wouldn't obsess about it. I assume Hazelnut coffee is made from Hazelnut oil and coffee. That is, it is if it's any good. You can relax though. Any flavorings for human consumption is most likely alright for compost. Now if they come out with beef flavored doggie coffee (And they probably will) I just might have to investigate first...

if it didn't kill you, it won't kill them :) Bill

Do coffee grounds repel pests?- I do not know, the caffeine and smell may repel something. A camel non-filter cigarette has been used to de-worm goats because the nicotine does kill intestinal parasites, but I have not heard anything about caffeine or coffee. Earth worms do love grinds mixed into the soil, but I do not see them in any of my piles of straight grinds. If the flavor of the ammendment carried thru to the taste of the fruit, my tomatoes would taste like the underside of a horses tail!!

Black coffee tastes too stong to me. Maybe, I have not aquired a taste for coffee. The oils in coffee taste bitter to me. However, I do want my coffee in the morning. I have one cup with breakfast, and then no more for the rest of the day. A number of years ago, I found out the hard way that coffee can be addictive. I'd sip several cups a day at my desk job, and then on weekends I had none. Sometimes, my Saturday would be ruined with a sick headache. It took me along time to realize that the headache was withdrawal symptoms from caffine. After I began limiting my caffine intake with none in the afternoon, the headaches went away. I'm not fussy about coffee. I want something quick and easy in the morning, so you will find me tossing instant coffee into my cup followed with hot water. I use a little creamer and "Equal" for sweetner. Sometimes, I'll have it black. Lately, I have been experimenting with a dash of ground cinnamon. It gives an interesting flavor. But wait! Wasn't cinnamon for tea? LOL.