Determine the size of your herb garden. This will be the predominant factor in the number of plants you will buy. If you have a small space, consider using containers for growing herbs.
Select herbs that will grow well in your hardiness zone while taking pride in your California heritage. Supplement herb garden staples such as basil, mint, thyme and rosemary with a selection of herbs that are native to California.
Amend your garden soil to improve drainage and nutrient content. Till the area in which you will plant your herb garden, removing approximately 18 inches of soil. Place 3 inches of crushed stone at the bottom of the area to improve drainage. Mix 3 to 4 inches of compost and 1 to 3 inches of sand into the garden soil, and return it to your planting bed.
Plant herbs approximately as deep as the container in which you purchased the plants. Space multiple plants apart according to plant directions; generally 6 to 12 inches.
Water herbs thoroughly after planting and regularly throughout the growing season. Most plants require 1 inch of water per week.
Harvest once the plant has enough leaves to maintain its growth. Picking your herbs too soon may diminish its growth and kill the plant.