The flower that is known by almost everyone: the sunflower. Talk about cheerful plants! These can bring a smile to a dreary day. This, too, is a very nature-friendly plant. Birds love to eat the seeds, so you might be fighting for them if sunflower seeds are a favorite snack of yours. :) Children will love planting this enormously tall flower and seeing how tall it grows. It will be a source of joy and mystery every day in your garden.