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Start the seeds 6 to 12 weeks before warm weather hits. Put harvested seeds through a process called "cold stratifying. Fill a container with seed starting mix. Plant the seeds. Cover the seeds with 1/8 inch (1/3 cm) potting mix. Keep the seeds in a warm spot. Lightly water the seeds. Wait for your seeds to sprout. Give sprouted seeds plenty of light.
Lavender seeds can take a while to germinate and should be started early indoors so that they have plenty of time to grow into mature plants during the warm growing season. " Place your seeds between 2 wet paper towels, then put them into a sealable plastic bag. Store the bag with the seeds in the refrigerator, leaving it there for at least 3 weeks. If you purchased your seeds, they've already gone through this process. Only stratify your seeds if you harvested them yourself from another plant. The seed starting mix should be a light potting mix that drains well. You can either use a plastic seedling tray or a wide, shallow container without divisions. Sprinkle the seeds on top of the soil. There's no need to bury the seeds, but you should sprinkle a light layer of soil over the seeds.  If using a plastic seedling tray, plant one seed per slot. If planting in a division-free container, space the seeds 1/2 to 1 inch (1.27 to 2.54 cm) apart. A light coating of potting mix protects the seeds, but the seeds also need access to sunlight in order to germinate. A heat tray often works best, but another work location may also work as long as the temperature remains around 70 degrees Fahrenheit (21 degrees Celsius). Keep the growing medium moist, but not damp, and water the seeds in the morning so that the soil can dry some before evening hits. Soil that is too damp and cool will invite fungus to grow, and fungus will destroy your seeds. Lavender seeds can take two weeks to one month to sprout. Monitor your seeds while you wait for them to sprout. Make sure the soil stays wet while you wait for them to sprout, and keep the seeds in a sunny area. After the seeds sprout, you should move the container to a location that receives plenty of direct sunlight. If no such location is available, place a fluorescent grow light about the sprouts and allow them to sit in the artificial light for eight hours a day.