Herbs are a great addition to any kitchen, and they can last a long time if you take care of them properly. Here are some tips on how to keep your herbs healthy: Water them regularly and make sure the soil is moist but not soggy. Place them in a sunny spot, but avoid direct sunlight. fertilize them every few weeks with a high-quality organic fertilizer. Prune them regularly to encourage new growth. Harvest your herbs regularly to prevent them from going to seed.