If you want to know which viburnums smell bad, arrowwood viburnum tops the list. U of Illinois Extension calls its flowers slightly unpleasant in scent. The odor isn't strong enough to ruin your yard. But you'll notice it standing near the plant during late spring bloom.
The viburnum flower fragrance varies a lot across different species. I grow both Korean spice viburnum and arrowwood viburnum in my garden, and the contrast shocked me the first spring. Korean spice viburnum fills the air with a sweet, spicy scent you can smell from 20 feet away. Then I walked over to the arrowwood, and the flowers gave off a flat, stale odor. Not awful, but nothing you'd want to sit next to during dinner outside.
The reason comes down to how each species gets pollinated. Sweet-smelling types like V. carlesii and V. burkwoodii draw in bees and butterflies with their perfume. Arrowwood took a different path. It gives off a flat scent that draws flies and beetles instead. Those insects go for earthier, less pleasant odors. The plan works great for the plant, but not so great for your nose.
The bad smell only lasts about 2 to 3 weeks during peak flowering in late spring. After petals drop, you won't notice any scent at all for the rest of the year. The berries, leaves, and bark carry no odor at all. So you're dealing with a short window of mild stink, not a year-round issue. I tested this by checking my arrowwood every week through the full growing season. The smell was only there during active bloom and gone within days of petal drop.
If you're sensitive to scent, plan your arrowwood viburnum placement with care. Keep it at least 10 to 15 feet (3 to 4.6 meters) from your patio, deck, or any outdoor seating area. At that distance, the viburnum unpleasant smell fades to nothing. Plant your sweet-smelling viburnums closer to where you sit and push the arrowwood to the back of your beds or along a fence line.
I moved my arrowwood viburnum from beside my deck to a spot 15 feet away after the first bloom season. The difference was huge. Now I enjoy the flowers from a distance and the birds still get their berries each fall. You get all the wildlife value and fall color without the off scent reaching your nose. A few extra feet of distance solves this problem with zero effort. If you love native shrubs but hate bad smells, just give your arrowwood some breathing room and you'll be fine.
Read the full article: Arrowwood Viburnum: Complete Growing Guide
