For an economic alternative to buying plants for the garden, consider raising annuals from seed. While many perennials take lots of time to mature, there are plenty of annuals that will come up quickly and give lots of color through the season. Foxglove, Cosmos, and Impatiens are all great choices. For long and short-term color, mix the annuals in among perennials. Be sure to plant according to the directions on the seed package and make sure the soil is warmed up before they go in.