Here is one of my favorite sites for coming up with container combos
http://www.provenwinners.com/combinations/
Now, don't think you have to buy their flowers, just the same type of flowers. All the work and figuring is done for you. Just have a look around the site. You can put in your season, pot style, pot size, etc...or just scroll down and have a look around (that's what I like to do). I guarantee you'll find something to suite you!
Ok, the difference between Potting Soil and Potting Mix is an excellent question. One I had to look up to answer correctly. I knew the answer, but had to rely on others to word it right, lol. Potting Soil is dirt...think of anything with the word "soil" on the bag as plain old dirt. Potting Mix is a soilless mixture made for containers. You would use Potting Soil more for something like a raised bed, NOT a container. If you used Potting Soil in a container it would turn to mud the first time you watered it and it would crush the roots of your plant. Potting Mix may be a little more expensive, but it's worth it.
Potting Soil is dirt...mud, mostly I think it's made out of reed moss. Potting Mix is larger particles...made from Sphagnum Peat Moss, Pearlite and other things to balance out the pH and help your plants do well, some also contain fertilizers and capsules that hold water (Miracle Gro type mixes). That's the kind of thing you want.
Good question! And I bet you thought it was silly, didn't you? MG (miracle gro) potting mix is a good way to go, but you can add ferts (fertilizers) of any kind to it whenever you'd like to. Don't be afraid to do that for potted/container plants.
