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A Dozen Sweet-Smelling Shrubs
Lilac season is about over. For the lasts two weeks I have been enjoying the amazing fragrance of ‘Miss Kim’, a species lilac (Syringa patula) with light purple blossoms. It was sold to me some 25 years ago as a dwarf lilac, but it is not. It’s just slow-growing. Mine is now 10 feet tall and wide. It was loaded with many hundreds of blossoms, and I was able to smell its fragrance from across the garden.
I have a gardening friend, Nelia Sargent of Claremont, NH, who specializes in fragrant plants. She is blind, so she cannot see their blossoms; she grows them, in part, because she loves their scent.
Miss Kim lilac
I called Nelia and asked for her list of fragrant shrubs. She told me that her goal is to have fragrance in her house and garden from spring until fall. “And I don’t want to have to put my nose in the flowers,” she said. “I want to smell them from 5 or 10 feet away, or even further.”
So she and I put together a list, roughly in sequence of bloom times. We agreed that even a shrub that should be fragrant, isn’t always sweet-smelling. So we recommend buying for fragrance when the plant is in bloom.
The earliest on Nelia’s list is a spring-blooming witchhazel (Hamamalis vernalis), one called ‘Arnold’s Promise’. It is hardy to Zone 4, but I have never grown it, but will. She has it and says it blooms in late winter. The frilly yellow blossoms are infused with red, and it is highly fragrant. She cuts blossoms and brings them in the house when snow is still on the ground, and they last in a vase for up to 2 weeks.
Close-up of February Daphne
Next comes February daphne (Daphne mezereum). I’ve had this for over 15 years, and like it so much I named my little corgi after it. It has nice sweet pink blossoms that bloom in April. Mine rarely needs pruning and is still not 5 feet tall and wide. Mine was winter damaged this year for the first time ever. I like to cut stems in March and bring them in to bloom indoors.
Then come the Viburnums. Many are fragrant, some very fragrant. Three that Nelia likes are Viburnum judii, V. carlessii, and V. burkwoodii. Many viburnums are susceptible to the viburnum leaf beetle, which can defoliate a shrub in a week or less. Nelia told me she has not had a problem with those three. Birds love the berries viburnums produce.
A nice fragrant understory shrub that I grew up with in Connecticut is spicebush (Lindera benzoin). Its flowers are negligible, but its leaves are fragrant. I learned this as a boy, pulling off a leaf and noticing the strong scent. As a teenager I chewed on the twigs, using them as a breath freshener! I was able to find one for sale and have been growing it in dry shade for 3 years now.
Nelia mentioned fothergilla (Fothergilla major) as a fragrant shrub with a pleasing subtle scent. I’ve grown it for 20 years or so, and love it for the white, bottlebrush flowers in May and fabulous fall leaf color; but I have never noticed the fragrance. Mine might be the exception, and once again proves it important to buy things in bloom if you want fragrance.
All lilacs have nice fragrance in bloom, I think. Nelia was once asked to judge their scent for the Arnold Arboretum at Harvard. She determined that there are at least 20 different lilac fragrances in their collection. If you select early, mid-season and late-blooming lilacs, you can have 5 weeks of fragrance and blossoms, she said.
Nelia Sargent noted that the Japanese tree lilac (Syringa reticulata) is very fragrant, but that it should probably be considered an invasive and not planted. Seeds are spread by birds, and this stranger from a foreign land can out-compete many of our native understory plants. The gardeners at Saint Gaudens National Park have observed this, and actively remove them whenever they see them.
Carolina allspice or common sweetshrub (Calycanthus floridus) has been blooming for me since mid-June and has lovely deep wine-red flowers; it prefers a shady spot with rich moist soil. Although Nelia considers it fragrant, mine is not, or just barely. Still, a shrub that blooms in shade is always welcome in my gardens.
In August there is summersweet clethra (Clethra alnifolia). Nelia says a pink variety called ‘Ruby Spice’ is very fragrant. I have the wild white one, and it is fragrant, but not very.
In late August or early September the seven-son flower tree (Heptacodium miconioides) tree blooms. It is a very fast-growing tree – branches can grow 5 to 7 feet in a single season, but it slows down some when it reaches its full size of 25 feet tall or so. Mine has a pleasant, but not overpowering scent.It has wonderful exfoliating bark that is splendid in winter.
This list of fragrant shrubs cannot include them all. Mock orange, for one, is very strong smelling. Some rhododendrons are fragrant, particularly the native swamp azalea (Rhododendron viscosum). Please write me if you have a favorite I have neglected to mention. Perhaps I need to grow it!
Write Henry at henry.homeyer@comcast.net or P.O. Box 364, Cornish Flat, NH 03746. Please include a SASE if you wish a response by snail mail. Henry is the author of 4 gardening books.
Designing a Garden, and Expanding Your Plant Palette
Want to have a spectacular flower garden? Nothing beats visiting a good garden when it comes to learning how to make your own better. I recently visited Kirkwood Garden on Rte 3 in Holderness, NH. I had visited it last spring when I was invited to speak at the Squam Lakes Natural Science Center. I was bowled over by the plant diversity, the beauty of the layout, and the tranquility of the garden. But I didn’t have my camera and notebook, so I went back in August and was once again delighted – and instructed – by the garden.
Broad view of Kirkwood
It is easy to look at a professionally designed and maintained garden and say, “I could never do that.” And for many gardens that’s true. Longwood Gardens in Pennsylvania or the Brooklyn Botanical Gardens encompass dozens of acres and are maintained by teams of workers year round. But Kirkwood Garden is less than an acre (in my estimation) and I’m told it is maintained by a single gardener. And it has not been around for decades. It was installed in 1996 – largely by volunteers, and with many donated plants.
So what pleases me so much about this garden? First is the overall design and layout. If you walk down three broad stone steps, you are on a large central lawn – but one that is carved up and delineated by curved flower beds, islands and walkways that head off to shady nooks. No straight lines here. I like that. And there are places to sit, with nice 2-foot square flagstones laid out in front, so that dozens of daily feet will not create bare spots. And there are shady places as well as sunny places to sit.
Each bed is backed by shrubbery, with the tallest plants towards the back. When I visited in spring, the rhododendrons, azaleas and mountain laurels were in bloom. Many different varieties, each with a different color and slightly different bloom time. Now there is summersweet clethra (Clethra alternifolia) with its intense sweet blossoms, and a lovely viburnum (Viburnum sieboldii) loaded with red berries held upright on bright yellow stems.
Also in the back of the beds – and blooming now – are many tall perennials. I grow and love snakeroot (also called bugbane, but technically Cimicifuga racemosa). But instead of a couple of plants, someone has planted many, or allowed them to spread over the 17-year life of the garden. I tend to have many varieties of plants inter mingled. They have many large stands of a single species, which makes a bold design statement.
A tall fall plant I have only tried once, and not found to be worth keeping, is Boltonia (Boltonia asteroides). They selected a variety called ‘Snowbank’, which my reference text tells me is unlike most boltonias, in that it is self supporting. It is 3-5 feet tall at Kirkwood and stands up without support, while the generic boltonia I tried was 5-6 feet tall and flopped over. At Kirkwood it has formed a cluster about 8 feet wide and 5 feet across and each stem supports a very small white daisy-like blossom. I shall try again.
Speaking of flopping, some annuals (purple cone flower, for one) were supported by horizontal grids of wire. Green wire mesh with 2 inch openings was supported on bamboo stakes about 18 inches off the ground (parallel to the ground) allowing stems to grow through the wire,. The wire was unobtrusive and kept the tall flowers from flopping. Very clever – but will I remember to do that next spring? And will you?
A shady nook at Kirkwood
An unusual fall bloomer at Kirkwood, which I have only rarely seen used, is yellow waxbells (Kirengeshoma palmata). This is a shade loving perennial with large maple-looking leaves and large yellow flowers. I have to admit it is slug bait, for me, but on a good year it can be a wonderful addition to a shady garden in the autumn. It is technically only hardy to Zone 5 (minus 20 in winter) but it has survived colder temperatures in my garden.
I learned there that the gorgeous bright red cardinal flower (Lobelia cardinalis) will survive in ordinary garden soil – not just in wet places (which is where it grows in the wild, and where I have it in my garden). Just plant in with some afternoon shade. I shall try that, too.
What else did I like about Kirkwood Gardens? It has maps everywhere, which although initially difficult to figure out, actually work quite well. You can learn the names of lots of different plants, annuals, perennials and woodies. And the garden is open year round and free to all. Donations are gratefully accepted. So you can visit often and see how special plants look in the different seasons.
Last of all, I agree with Barbara Gillan of Stillwater, N.J, who I met while admiring the garden. She and her family visit every year and remarked, “It’s a great place to go when you want to daydream.”
Henry’s web site is www.Gardening-guy.com. His newest book is a fantasy-adventure for children, Wobar and the Quest for the Magic Calumet.