I did it with the used grounds from Starbucks. They gave me some in a plastic transparent bag, I have no idea how much is there. Anyways, I've rebrewed them and already used the resulted liquid. It was pretty concentrated, imo. Now let's keep fingers crossed.
I have about 30 seedlings and a few bigger cycads and about 10 seedlings and less than 10 plumerias. I gave them all although only the cycad seedlings were attacked by the mealybugs, just to make sure no one of them is going to take refuge onto one of the unaffected plants.
Thank you all for the advice!
