This project is about planting sunflowers in a square, circle, or any other shape you’d like. You can use plants other than sunflowers, corn, canna lilies, bamboo, use plants that work well for your region. You can look at the American Horticultural Society Plant Heat-Zone Map to learn what plants will do well in your climate. If the sunflower house is a success you could create a permanent house using trees or shrubs in the same layout. An apple tree house perhaps?