Note: Consider creating a perennial cutting garden if you enjoy bringing flowers indoors. If you’re looking for flower garden ideas for beginners, start small: You can continually expand your plan if you want or go bigger next year. The tallest plants should go in the center if your flower garden design is an island. Also, keep a plant’s mature overall size in mind to ensure it has enough room to grow without crowding its neighbors or spilling out of the bed too much.