The Wonderful Wizard of Winter: Native, Snow-Draped Canadian Hemlock

February 10th, 2011 § Comments Off on The Wonderful Wizard of Winter: Native, Snow-Draped Canadian Hemlock § permalink

Tsuga canadensis – Native Canadian Hemlock

I try very hard not to play favorites with the plants growing in and around my garden. In fact, you may have noticed that I’ll refer to a preferred species as ‘one of my favorites’, as opposed to ‘my favorite’. After all, I truly love each and every one of them, and I wouldn’t want to hurt any of their feelings. Still, there are a few stand-out, four-season beauties that I can not imagine living without. And in the great world of conifers, I must admit that I am quite partial to our native Tsuga canadensis, commonly known as the Canadian or Eastern hemlock. Though graceful and verdant year-round, Canadian hemlock is a true stunner in the winter garden. After a snow storm —when Tsuga canadensis is cloaked in a fresh coat of powder or ice— it’s impossible not to think of the enchanted forests of fairy tales. I absolutely adore this feathery, magical evergreen.

A few years ago —when I was planting an informal hedge of Canadian hemlock at a private residence— one of my garden clients told me that the shape of the hemlock tree reminded her of a wizard’s hat. Well I already liked this woman, but as soon as she said that, I knew I was going to love working with her. For long as I can remember, I’ve always thought of the Canadian hemlock as a Winter Wizard or even a Warlock (a masculine witch). And as a child, I loved playing beneath the tent-like boughs of hemlock stands; draped in heavy, sparkling white robes after a snow storm. Hemlock is a magnificent native tree; one I never grow tired of praising.

The pliant boughs of Tsuga canadensis are less likely to break when covered in heavy snow and ice

The outer branches of hemlock trees, as well as the tip or leader, are narrow and flexible. The pliant boughs give hemlock the distinctly cascading, somewhat melancholy appearance I find so enchanting. But more importantly, the springy quality of the outer wood gives this native tree an ability to shed snow and ice, avoiding winter breakage –a common problem for other conifers, such as white pine. Hemlock needles are softly rounded; blue-green on the top and silvery on the reverse (the shiny-whitish color is created by tiny openings along the backside of the needles called stomata, which —for lack of a better word— allow the tree to ‘breathe’). When breezes blow through a hemlock’s bows, the pale undersides of its needles are exposed to light; creating a subtle, shimmering effect. Growers have worked with this trees beautiful cascading habit and needle coloration, developing cultivars with mint-tinged branch tips and weeping forms. And because it responds well to pruning, eastern hemlock offers four-season privacy screening when grown as a soft, ever-green hedge in semi-shaded, moist sites. The feathery, deep green needles provide a lovely contrast and sensual backdrop in many of my garden designs.

The Tops of Canadian hemlock (Tsuga canadensis) boughs are covered with dark, blue-green needles

On the reverse side, Tsuga canadensis needles have a light, almost silvery-green color. And when wind blows through the branches, lifting and exposing the undersides of needles to flashes of light, the Canadian hemlock takes on a subtle, gorgeous, two-tone appearance.

With a North American range spanning from Nova Scotia southward to the mountains of Alabama and westward to Minnesota (USDA zones 3 – 8/9) Tsuga canadensis is commonly found in moist, shady woodlands; often along forest streams or cool, north-facing ridge lines. Because of their wide-spread but shallow-root tendency, hemlock are vulnerable to drought, but are less likely to be knocked down in high winds. Here at the northeastern crest of my ledgy site, substantial stands of native hemlock provide a safe haven and nesting habitat for local birds as well as food (seeds, twigs, bark and needles) and shelter for various mammals (including squirrels, porcupines and deer). Although hemlock can grow over 100 feet in ideal conditions, they typically reach 40-70 feet within their native range. When grown as a specimen tree in the open —or planted in small groups—hemlock will develop a soft, full, conical shape (yes, shaped quite like a wizard’s hat).

Because hemlock trees produce acidic tannins, they are quite disease and insect-resistant. However, there exists one recent and notable exception: the wooly adelgid (Adelges tsugae). Closely related to common aphids, this invasive insect pest —introduced from Asia— has the potential to wipe out native, eastern hemlock populations (read more about this pest and how infestations are treated at the UMass Extension Service website here). Although I have not seen the wooly adelgid in my immediate area, I am constantly on the lookout for this destructive insect when pruning hemlock hedges for my clients in early spring. Currently, the only effective, organic treatment for wooly adelgid is thorough, repeat applications of horticultural oil. Entomologists continue to search for natural, biological adelgid controls, and I have high hopes for the tree’s survival. I simply can not imagine the northeastern landscape without my beloved Winter Wizards…

This Canadian hemlock trio forms a soft, four-season screen at the northeastern edge of my garden

Here in late November, the Tsuga canadensis trio provides color and textural contrast and backdrop to the red-twig dogwood, birch and ornamental grasses in the foreground of the entry garden

This beautiful, weeping hemlock (Tsuga candensis ‘Pendula’) —pictured here at The Bridge of Flowers in Shelburne Falls, Massachusetts— is one of the finest examples, and uses of the pendulous form, that I have ever seen. See more photos, and read a bit about The Bridge of Flowers by revisiting this post (click here).

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Article and photos are ⓒ Michaela at TGE

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The White Witch Cometh…

February 27th, 2010 § 5 comments § permalink

The Morning after the Storm…

The White Witch roared back up the hill last night in her icy chariot. My oh my, is she a beautiful and treacherous queen. She was angry, and she swirled her crystal scarf and heavy cloak in a fit of rage. Behind her, the cold sorceress dragged a wet blanket of snow so thick that even the greatest trees bowed beneath the weight of her power. “Did you think I would leave so soon?”, she hissed and cackled all night into the howling wind. “How dare you flirt with my younger sister…“. I could almost hear her shaking with laughter in the forest. Yes, she has banished my Spring dreams. This is her season after all, and she is not yet ready to hand over her crown. Fierce Winter will take her leave of us when she is good and ready, and she will likely slam the door…

To the south, the oak and ash stand like ghostly skeletons in the morning light…

And to the west, a towering pine bows in submission…

The hillside traced in snow…

Sunlight makes an early morning appearance through the icy fog and mist…

The Japanese Maple as a Jackson Pollock…

The remains of Miscanthus sinensis ‘purpurascens’

Broken and battered, the last papery petals cling to Hydrangea paniculata ‘Limelight’ in the snow…

Pointy as a wizard’s hat, native hemlock has always been my favorite winter conifer…

Low clouds break to the east…

The glorious, burnt orange leaves of native beech still cling to her snow coated branches…

Viburnum trilobum ‘Bailey Compact’ reminds me of a porcupine, all prickly in the soft snow…

Stewartia pseudocamilla strikes a graceful silhouette against the snow drift in the Secret Garden…

Three Magical Warlocks…

Regal pines stand sentry on the western slope…

The tree lined forest path, draped in fresh white lace…

A young spruce droops beneath the weight of a heavy new coat…

Gorgeous, horizontal lines of beech amid the vertical striped forest…

Grey clouds make for a dramatic backdrop after the storm…

Pale morning light…

The door to the Secret Garden…

The velvety black remains of Physocarpus ‘Diablo’, sparkling in ice crystals…

Top of the snow-covered drive…

The forest at Ferncliff in all the White Witch’s Winter glory, {and 3 feet of snow}

Inspiration: The Chronicles of Narnia: The Lion, The Witch and The Wardrobe

Article and photographs © 2010, Michaela at The Gardener’s Eden, All Rights Reserved.

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