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How to Grow Snapdragons Snapdragons are undemanding and can grow in a wide selection of colors and heights. They are at their best in cool weather. Snapdragons are tender perennials that are only hardy in U.S. Department of Agriculture Hardiness Zones 8 or 9. They can repeat bloom throughout the season but do best in the cool of spring and fall and throughout the winter in mild climates. In most areas, they are commonly grown as annuals. Even when they do overwinter, they never seem to bloom as robustly as they did in their first year, which leads many people to think they are biennial.   Light Your snapdragons will bloom most profusely in full sun to partial shade in the spring. Once the temperature heats up, they may stop blooming altogether. Planting them in partial shade and keeping them well watered will help them make it through the summer and likely bloom again in fall. However, they are quick to get established and it can be just as easy to replace your snapdragon plants each season.   Soil Snapdragons like a neutral soil pH between 6.2 and 7.0. As short-lived plants, they are not heavy feeders, but adding organic matter will help keep them healthy and blooming.   Water Snapdragons need adequate watering. When growing snapdragon, keep moist for the first few weeks. Once established, snapdragon will need approximately an inch of water per week in times of no rainfall. Water near the crown of the plant and avoid overhead watering to keep your snapdragon healthy. Once established, let the soil dry about an inch deep before watering.   Temperature and Humidity Snapdragons prefer cooler temperatures. Snapdragons grow best when nighttime temperatures are in the low 40s and daytime temperatures in the low 70s Fahrenheit.