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Not all plants require the same amount of water. If your herbs did not come with a care tag when you bought them, you'll have to research them online. In general: Mediterranean plants, such as oregano, require less water. Let the top 1 to 2 inches (2.5 to 5.1cm) of soil dry before you water them again. Water-loving herbs, like basil, require constant moisture. The top 1 to 2 inches (2.5 to 5.1cm) of soil should feel like a damp sponge. When watering, use enough water until you can see it coming out from the bottom of the pot. How often you use the fertilizer depends on what you are using. If you are using a liquid fertilizer, you need to use it every 3 to 4 weeks during the growing season. If you are using a slow-release fertilizer, however, you only need to use it once or thrice per year. For best results, use a slow-release organic fertilizer, or a half-strength liquid fertilizer. Make sure that the fertilizer is suitable for herbs. Read the label. How much sunlight your herbs need will very, so read the care tag or research the information online. In general, most herbs need around 6 hours of daily sunlight, but some may require more. The strength of the sunlight is also important. South-facing windows will provide the best, strongest sunlight, whereas north-facing windows will give you the weakest sunlight. If your herb pot is on a windowsill, you may have to move the pot around throughout the day or year. This is because windows can become really hot or really cold. You don't have to remove the pot from the window completely; a table next to the window would be just fine. If you put the herbs outside and the temperature rises or drops below the ideal range, you may want to bring the herbs inside. When harvesting, you want to leave the larger leaves at the bottom along so that they absorb more sunlight. Be sure to prune off spent flowers and leggy stems as you see them. This will result in stronger, bushier herbs. You can pinch the herbs off with your fingers, or you can cut them with scissors. If you decide to use scissors, however, make sure that they are clean. Unfortunately, not all herbs last forever. Some herbs are annual and need to be replanted every year. Others are perennial and will return every year. A few herbs are biennial and need to replaced every 2 years.
Water your herbs according to their watering needs. Use a fertilizer a few times per year. Rotate the pot as needed to ensure that herbs get enough sunlight. Keep the herbs at a temperature between 65 and 70F (18 and 21C). Harvest the herbs from the top. Replace the herbs as needed.