So why does viburnum smell? The flowers make chemical compounds that float through the air to draw in bees and butterflies. These scents act as signals to pollinators. The type and strength of smell changes a lot from one species to the next.
I've smelled the full range of viburnum fragrance in my own yard over the years. Korean spice viburnum puts out a sweet, clove-like perfume that fills the air within 20 feet of the plant. It smells like a spice cabinet on warm spring nights. Then I walked to an American cranberrybush in bloom at the same spot. It hit me with a musty, sour smell that made me pull back. In my experience, that contrast shows why your species pick matters so much when scent is a goal.
Each viburnum flower cluster holds 15 to 500 tiny flowers per research by Sharifi-Rad and others. Many types make two kinds of blooms in the same cluster. Big sterile flowers ring the outside to catch your eye. Tiny fertile flowers sit in the center and make the scent. The showy ones draw pollinators in by sight. The small ones seal the deal with smell. That's how the viburnum fragrance system works.
The best fragrant viburnum species for your garden are Korean spice, Burkwood, and Cayuga. Korean spice tops the list with its strong clove perfume. One plant can scent your whole patio area. Burkwood gives you a lighter sweet-spice aroma. It also stays semi-green in mild winters. Cayuga offers a gentle scent for those who want fragrance without it being too strong.
Not every viburnum smells good though. Siebold viburnum gives off a musty odor when you crush its leaves. Some cranberrybush types have blooms that smell sour or fishy to certain noses. If you've heard someone gripe about viburnum stink, they likely stood near one of these less pleasant types. They weren't near a fragrant viburnum species at all.
Put your fragrant viburnum species within 10 to 15 feet of where you sit outside. A Korean spice beside your patio chair or under your bedroom window gives you weeks of natural perfume each spring. Keep the musty types farther back in your yard. Their flowers and berries still add beauty from a distance. Match the right species to the right spot and you'll turn viburnum fragrance into one of your garden's best features all season long.
Read the full article: Best Viburnum Shrubs for Every Garden
