Medicinal plants for greenhouses?

Hi!
I was wondering what are the best medicinal plants that can be grown in greenhouses.
When i say best, i mean plants that are relatively easy to grow and have a great market request.
Thanks!

 

The ones that come immediately to mind are Valerian, St. John's Wort (Hypericum) and Echinacea. However, if you're dedicated to a true hothouse, you should also look at Uncaria tomentosa (cat's claw), Passionflowers, and the other tropical medicinals.

 

Aloe vera?

 

Here's a few more....


http://www.pfaf.org/leaflets/top20.php

 

Thanks so much for the replies.
Bluewing, i've checked that page, but i'm interested in those that can be easily grown in greenhouses, especially in artificial soil.