Datura aka Moonflower-best in smell-Like nicotiana, this annual is perfect for evening gardens as the big, pure white trumpet-shaped flowers are most fragrant as the sun goes down. It's gorgeous and easy to grow as it thrives in hot, sunny weather
Lilac Lilacs are among the most recognizable spring flowering shrubs. If you miss their large cone-shaped flower trusses, you can't avoid their intense fragrance. Lilacs are durable and able to put up with most any growing conditions except shade.
UPDATED Infographic: Want more butterflies in your yard? Plant the nectar plants they love! Here’s a great list of butterfly-attracting annual and perennial plants — including those needed for butterfly larvae. – New Gardening Ideas
Best Fragrant Flowers for your garden-Nicotiana-Look for old-fashioned varieties of nicotiana to fill your garden with a strong, sweet fragrance. Plant it near your patio or bedroom window as the scent is most pronounced at night.
Southern Magnolia (Magnolia grandiflora): Beautifully fragrant, creamy-to-white spring flowers; large, shiny, evergreen leaves with a fuzzy underside; and red fruit in fall. It's a large tree, reaching 60 to 80 feet tall and 30 to 50 feet wide.