My parents use this really nifty box called an Earthbox, and their website is:
http://www.earthbox.com/index.htmlThe more I look at this, the better it looks for a couple of Salvia plants, despite the fact that it is marketed for veggies.
We have two right now that are growing tomatoes and they work really well, as the pictures attest to:

The plants are huge, they grow quickly and strong, and there are just oodles of tomatoes on the plants.
If these things work this well for Salvia, we could be in business- I just don't know if I want to drop $50 on one.
What do ya'll think?
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thanks for the image help, JARG!