Herbs are excellent plants for container gardens. Favorites include sage, parsley, mint, basil and rosemary. Herbs justify their place in the garden in a variety of ways. They're often used for cooking, medicinal purposes or aromatic foliage. Herbs also can be used to repel pests or protect other plants beside them. That said, some herbs proliferate quickly and can be quite invasive. These types should be contained in a pot away from winds that can scatter their seedlings. Flue liners and other containers without a bottom work well for planting, as an herb's roots can easily grow into the earth while still staying contained. Just settle the container into the ground, fill it two-thirds full of garden soil (not potting mixture). Plunk in the plant, water, then top off with soil about 2 inches (5 centimeters) from the rim.