Herbs are well suited for container growing because they have a lot of flavor, take up little room and can be harvested continuously. Growing herbs in containers allows you to bring your portable herb garden indoors over the winter for year-round growing and harvesting. Plant herbs in individual pots, or group them according to culinary use, suggests Pennsylvania State University Cooperative Extension. Rosemary, thyme, sage, oregano, cilantro, mint, parsley and basil are just a few of the options for a year-round, container herb garden.
Plant herbs in individual 6-to-8-inch pots or plant herbs like rosemary, sage, oregano and thyme together in a 15-to-18-inch pot. Parsley and cilantro grow well in wide-mouth, shallow pots. Mint and lemon balm spread quickly with underground roots, so keep them in individual 10-to-12-inch pots.
Fill the pots with well-draining potting soil mix. Make sure each pot has one or more drainage holes in the bottom to allow water to drain away from the root systems.
Make holes in each pot that are slightly larger then the root ball of the herb. Space each plant 3 to 5 inches apart to allow it room to grow.
Place each herb root ball in a prepared hole so that the base of the stem is level with the surrounding soil. Pat down the soil firmly to secure the root balls in the soil. Water the soil until water drains from the holes in the bottom and set the pots in the sink to drain.
Place the the potted herbs in a sunny window or covered porch where they will get at least six hours of sunlight each day. According to Pennsylvania State University Cooperative Extension, indoor herbs require day temperatures that are at least 65 to 70 degrees F and night-time temperatures that do not drop below 50 degrees F.
Add water when the top 1/4 inch of soil is dry to the touch. Place the potted herbs close together to create a humid environment around the plants, and mist the leaves every few days. Turn the pots every other day so that all sides of the herbs get plenty of sun.
Place pots outside when the day temperatures are above 65 degrees F and the night temperatures are not dropping below 50 degrees F. Move plants into full outdoor sun a few hours a day until the plants are accustomed to the bright sunlight.
Fertilize every other week with a mild organic fertilizer formulated for herbs. Harvest your herbs as you want to use them but don't take more than one-third of the plants' green growth at a time.