I recently planted strawberry plants (which i acquired from Binder Farm) from packs of four into one of the strawberry jar planters. The planter has 6 pockets. I planted the rest at the top as well as direct sowed in borage seeds.
Herbs are usually sold in pots. The sizes I've seen start at 3" inches. I find the smaller pot is an adequate size for buying herbs. It's small enough to manage and repot with other herbs in a larger container. And, I'm only interested in starter herbs as opposed to buying herbs that have been established. Not only that but herbs tend to be prolific growers. They will keep producing more leaves and sprout more shoots each time you cut them or pick them. A little herb plant can go a long way! Most small potted herbs are inexpensive and sometimes there are great deals the more you buy.