An herb garden provides both attractive plants to your landscape as well as fresh herbs for use in the kitchen. Most herb plants that thrive in the garden also grow well in planters that are set in a sunny place. Large concrete planters are readily available at garden centers and can house several different varieties of small herb plants or one type of large herb. Use the planters and herbs to bring edible greenery to patios or place the planters so they frame walkways.
Place the concrete planter in its permanent location. Once it is filled with soil and plants it is difficult to move. Set the planter on top of bricks if the drainage holes are in the bottom so excess water drains freely. If the drainage holes are on the side of the planter it can sit directly on the ground. Newly cast concrete may leach lime into the soil and damage plants. Fill the planter with water and keep it filled for 10 days. The water will leach out the excess lime.
Fill the planter to within 3 inches of the rim with a quality, well-draining potting mix. Water the mix until the excess moisture begins draining from the bottom of the planter to ensure it is evenly moist.
Plant herbs to the same depth in the container soil as they are at in their nursery pots. In general, a planter holds one herb plant for each gallon of soil it contains. Leave 6 to 8 inches between the herb plants, except for large plants, such as sage or rosemary, which require 1 foot or more of space.
Water the soil thoroughly after planting, collapsing any air pockets in the soil around the roots. Lay a 1-inch layer of mulch over the top of the soil to help preserve soil moisture between watering.
Check the soil moisture daily, as concrete planters dry out more quickly than other types of planters. Stick your finger in the soil and if the top 3 inches of soil feel dry, water the herbs until the excess moisture begins draining out the bottom of the container.
Fertilize every fourth watering with a soluble, quick-release fertilizer following label instructions. Like water, nutrients leach quickly out of concrete planters, so they must be replaced regularly.