Hi Mark,
I am still working things out by trial and error with pots, eg is moving them up from size to size more disruption than starting them off in a pot too big?

It also makes a difference if you are treating them as annuals or to be picked young for the table. eg some people grow lots of basil thickly in a pot and then harvest the lot when they are about 20cm tall. (Or even more extremely for micro herbs).

Because my eye is on longer term growing I go for the biggest pots I can. These don't dry out so easily or need feeding so often. I started off with those white polystyrene containers I could get for free from the back of the veggie shop. (This sort of thing): http://permaculturepathways.blogspot.co … -gift.html
They insulate well and are a good size to hold a couple of plants but still be movable.
(I put holes in the bottom with a screwdriver.)

I started off my thyme in one of these with a few other herbs in, but after several years it has taken over the whole box.

I planted basil seedling in two of these. I divided a punnet between them. But I harvested some early so now I have three pants in each box that have fed me and my neighbours all through Summer.

Parsley has a long taproot and hates being moved. The long tap root means it needs a deep container. Mine selfseeds now, I get hundreds every year and just keep those that grow in the most convenient pots.

Oregano can also grow to quite a big bush.
Like the thyme, I would start it off in a big pot with a few little plants around it (lettuce, radish, rocket...) and then by the time they are picked and eaten the oregano can take over the whole pot.

Best wishes
rambling Joy   

Aflower, thanks for the info. My basil starter plant came in such a bio pot. Cut the bottom half off and planted in dirt. Nice idea. I ended up with #10 pots, suggested I not use smaller. The herbs are doing well so far! I wanna eat some!!!!!!

Mark