Some of the leaves on the hibiscus have developed a kind of green wart on them. Otherwise they look pretty healthy. The only new thing I have done to them in sprayed them with Miracle grow. I don't think they were there before. It is only on a few of the leaves. Any Ideas and what should I do. Thanks
It looks like Hibiscus erinose mite, a dangerous pest.
It's recommended to cut the stems affected and destroy them. For the rest use a miticide.
Your agricutural department (I don't know how it's called there) can give you more instructions (I guess the first one will be put it in quarantine).