How to grow herbs in containers
Growing herbs in containers is a great way to have kitchen herbs close by for snipping as you're cooking.
Spreading herbs such as mint are also easier to control when you grow them in pots.
With rosemary, which is not hardy in cold winter regions - growing in a container makes it easier to take the plant inside.
Herbs in containers need:
Full sun: 6 hours minimum.
Big enough containers: At least 10 to 12 inches (25 to 30 cm) deep with one or more holes for good drainage. Larger containers such as half barrels give you enough room to grow several kitchen herbs in one space.
Soil-less potting mix: Don't use garden soil, although you can add a little compost or bagged manure to enrich potting soil.
Watering: How much to water depends on the weather, the plants and the size and type of pot. Terra cotta containers dry out quickly and usually need daily watering high summer. The larger the pot, the easier it is to keep moist.
Fertilizing: Like all container plants, herbs need fertilizer. Slow release fertilizer pellets added to the top layer of soil at planting are easy: they feed constantly over the growing season. Or give soluble fertilizer with watering once a week.
Growing herbs in containers indoors
Although it's tempting to take your herb plants indoors for winter, especially perennial types, unfortunately, in northern regions even a south-facing window gets a lot less sun in winter than the plants need.
It helps to remember that most culinary herbs thrive in the hot and sunny Mediterranean, and that they do best in such conditions.
Mediterranean winters are moist, but central heating keeps the air very dry, which is another disadvantage.
Growing indoors in winter, your herbs won't be as flavourful - they need heat and sun to create the aromatic oils that make them zesty.
For success with herbs in containers indoors, you need:
A sunny south-facing window, plus a florescent grow-light for extra brightness.
Growth will slow down, so harvest small amounts only (if your goal is to keep plants for next year); or continue to harvest until you use leaves up and then discard plant.
Water when potting soil feels dry to touch. Avoid overwatering, but mist around the plants often.
For best winter survival of rosemary, move plant into shadier spot outdoors in early fall to acclimatize to lower light.
Indoors, keep pots in a cool bright window with a florescent grow light. A bright, unheated sun porch is ideal, as long as temperatures don't dip below 21ºF
(-6ºC).
Related information:
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