Sorry for the delay, yesterday, my hands were too tired from clarinet lessons, and there was a 2 hour MasterChef on... so yeah. Anyways, WaveNote guessed the last herb correctly! It was lamb's ear. Gordon Ramsay says it's quite delicious. Here's the next one:

Use me as a last resort,
For I am poisonous,
And will make you useless.

Please remember, read my new book: Guess That Medicine Cat! Also, I am looking for books to read. If you have a book you'd be happy to let me know, please do so. :D
~Night