For growing info, try posting here:

http://forums.gardenweb.com/forums/herbs

The Herbs forum is a great place for all manner of growing and herb plant care questions. There are MANY threads about growing herbs in containers. Check through the back posts for those. General info applies to your question. Even though most posts are about culinary herbs, all herb growing and culture posts are welcome.

Container general rules are: only 1 species per pot, indoor culture is difficult at best as most herbs require sun and outdoor conditions to be healthy, and you must check what other requirements (soil, water, etc.) the plants may have to give the best care. After that, as long as you are not overly crowding a plant in whatever size pot you have, you can have multiple individual plants in a pot.

FataMorgana

Who made a rule about only 1 herb species per pot?

Many herbs have similar growing requirements and do fine together.

http://www.bhg.com/gardening/vegetable/herbs/best-herbs-for-container-gardens/

Rusty, go check out years of back posts on the Herbs forum. That is the general consensus from many who have given advice there. Yes, you can put multiple species in a pot but for optimum health and vigor only one.

No one has ever argued that the mixed pots of herbs aren't attractive. They certainly are. That is why BHG has an article on it. Its great for selling their magazines. But for best growth and ease of care -- 1 and only 1 in a pot.

FataMorgana

The people who've run into problems with mixed container planting typically didn't follow one (or both) of the following guidelines:

"You can grow herbs in pots together as long as you remember two rules: avoid mixing those that like plenty of water (such as chives, mint, chervil, coriander, Vietnamese coriander) with those that like a well-drained soil (such as rosemary, thyme, sage, bay, and oregano). And choose herbs of similar sizes for the same pot – a large rosemary will swamp a small thyme plant, for example. So if you want to mix rosemary and thyme, look for a small, compact form of rosemary."

http://www.theguardian.com/lifeandstyle/2014/aug/15/ten-best-herbs-grow-containers

One can make the argument that for optimum health and vigor, herbs should be grown in the ground and not in containers at all. But since a lot of people don't have space for that, containers (including mixed containers) work out just fine.