Methods for planting in a garden container are just about the same for every plant, whether you bring it home in a cell pack, flat, or nursery container of some kind. If you are starting from seed, then just follow the instructions on the seed packet.
Of course the most important thing to consider is the container you start with. Make it large enough to accommodate plant growth but not so large that the plant is dwarfed by the pot.
Try to find the kind of planter, poly resin, terracotta, etc that suits your needs along with the color, finish and style that you desire. We have many more blog entries on how to select a container so please refer to one of them for more details.
When planting in a pot that has been used before, begin by cleaning it out with a brush and hot water. Bleach will eliminate moss and disease and vinegar will dissolve accumulated salts. It's best to soak terracotta prior to planting so that the root ball doesn't absorb all the moisture.
Cover the drain hole with mess screen, pottery shards, pot filler, or gravel so prevent clogging but allow drainage. You can plant in a pot with no hole but certain measure need to take place.
Take the nursery container and water it thoroughly first before trying to remove the plant. Always try to leave as much soil around the root ball as possible. Run a table knife around the pots inside edge. Invert the pot and tap it gently to loosen the plant.
Let the plant drop out, do not tug or pull. If your plant is in a gallon or larger nursery container it is best to cut the plastic pot away from the root ball. It is best to plant as soon as possible to prevent the root ball from drying out.
Moisten the potting soil. Pour some into the pottery making it thick enough to hold the top of the root ball about 1" below the pots rim. Fill in more moist soil around the plants sides, pressing it firmly to remove air pockets.
Don't smash it down. After planting, water the soil thoroughly and tamp the soil to firm it. You don't want sitting water on the top of the plant.
Keep your eyes on the potted plants for the first few days or so. Make sure that it doesn't sink and need to be refilled. Also check to see that the water is draining off properly and the roots are not sitting in standing water where they can rot.
Follow these simple steps and have fun creating a potted garden.