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When thinking about what you want to grow, consider how much shade and sun the area gets. If it's fairly shady, you need to pick a flower that's going to be happy in that area. Also, consider how much work you want to put into your garden. That is, you can plant perennials that come back every year, but that don't bloom as much as annuals. With annuals, you need to plant them each year, but you'll get more colorful blooms that last longer.  Also, make sure the flowers you want to grow are zoned for your area. You can look up your zone online or ask at a local nursery. Some perennials to try include daylilies, pansies, irises, lamb's-ears, black-eyed Susans, Russian sage, and roses. For annuals, try zinnias, marigolds, cosmos, and sunflowers. You can also mix and match annuals and perennials for the best of both worlds. One simple solution to getting flowers is to simply buy them from a garden store, nursery, or farmer's market. Look for healthy plants with lots of leaf growth. If you'd rather grow your own, you'll need to buy seeds from a garden center or an online catalog. A simple way to start seeds is to use a cell flat, which has individual spaces for each plant. The plants need to be separated so the roots don't intertwine. However, you can use other individual containers, or even a cardboard egg carton to start seeds. Just be sure whatever you use has a hole in the bottom for water to drain out. Some containers are meant to be placed into the ground with the plant because the containers are biodegradable. Seed-starting mixtures don't contain any soil and drain well. In addition, they don't contain any weed seeds that could grow in the mixture. Potting soil will also work, but you may not be quite as successful with it. When you plant the seeds is based on the plant itself. Usually, that information is found on the package, but you can also look online. Often, you can plant two to three weeks before the last frost in your area. However, you don't want to plant too early, as the plants will outgrow their containers before you have a chance to move them outside. Follow the directions for the plant, but generally, you plant a single seed in each container you have. Plant the seed at a depth that is four times the width of the seed. In other words, smaller seeds need to be closer to the surface, while bigger seeds can go a little deeper. Label the seeds, and keep the soil moist to help them grow. Windowsills aren't the best place, since the temperature can vary from cold at night to hot in the day. Instead, pick a warm area free from drafts. In fact, you can just use a grow light to provide light to the plants somewhere in your house.  It can help to use a heating pad meant for seeds. It goes under the containers, which can keep the soil warmer, promoting growth. If using a grow light, remember you shouldn't leave it on all the time. It should only be on for twelve to sixteen hours in a day.
Pick what you want to grow. Buy seeds or flowers. Find containers for seeds. Place a seed-starting mixture in the containers. Plant the seeds inside two to three weeks before the last frost. Place one seed in each container. Find a warm spot with good lighting.