1. Start with a simple, smooth bed line. No wimpy curves allowed. When in doubt, swing it out. You won't regret the extra room when plants start to grow in. This bed line should start on one side of the yard and move your eye across to the other. Space plants within the bed so that they echo this curve. Why you'll be glad you did: Good bed lines can camouflage design flaws and waning plants. They also make it easier to mow the grass.