We have finally thawed out here in Seattle after a week of Tundra-like conditions. Well OK compared to those of you who live in Boston or Alaska this is probably still balmy but my plants didn’t think so.
Just a short while ago my gently frost-kissed garden looked like this;
Today after a week of temperatures struggling to get out of their 20′s it looks more like this;
Not quite Fine Foliage is it?
So I decided to go out into the garden and see what looked as good after our deep freeze as it did last summer. To make the challenge harder I was specifically looking for evergreen grasses that still looked great.
The results are in! Here are the best of the best in my zone 6b garden and in the interest of full disclosure no cheating took place – all these images were taken December 16th on a cold, grey day.
Sirocco pheasant tail grass (Stipa arundinacea ‘Sirocco’)
Sirocco pheasant tail grass keeps its bright coppery tones all winter
This grass has been a trouper since the day I tucked a 4″ pot into the corner of a container a few years ago. Regardless of hot sun or freezing cold this grass hasn’t missed a beat. Many evergreen grasses need at least a little trimming each spring but not Sirocco which seems to be truly maintenance free
I transplanted this into a well drained part of the garden in fall where I’m enjoying it near this mossy Exbury azalea. In spring the azalea will explode with fragrant, golden blooms, each tinged with deep red – what a spectacle that will be!
Hardiness; reports vary but USDA zones 4-9 are generally cited.
Size; the three year old plant above is 2′ tall and 3′ or so wide.
Light; full sun to light shade
Note; I also have the regular pheasant tail grass and while it is still thriving Sirocco is more colorful.
Ice dance Japanese sedge (Carex morrowii ‘Ice Dance’)
Ice Dance Japanese sedge is a reliable performer
While this grass-like plant does have a desire for world domination, it can be a very useful evergreen groundcover for tricky areas. Here I let it edge a large border which can get waterlogged during the winter yet never gets watered at all in summer. It is also a major deer highway so I am thankful that grasses do not seem to be on their menu and that Ice Dance can cope with being trampled on.
I wouldn’t use this in a highly visible area as the tips of the blades often turn brown and need trimming away in spring- a chore I can choose to ignore in this more distant border. Ice Dance spreads rapidly by underground stems which makes it unsuitable for small spaces. Also to keep it looking its best the clumps need dividing every few years so this is not a low maintenance choice.
Having said that just look at how much it adds to the winter garden. The bright green blades are edged with crisp white margins, each clump mounding nicely.
Hardiness; zones 5-9
Size; 12″ tall x 2′ wide but spreads indefinitely
Water; avergage to moist
Light; prefers afternoon shade
Golden variegated sweet flag (Acorus gramineus ‘Ogon’)
Fan shaped yellow blades look this good all year
The rather waterlogged purple Heuchera betrays the recent weather conditions but otherwise this photo could easily have been taken in June. The sunny-yellow sweet flag brightens up the winter garden and is completely unfazed by cold weather. It is a great addition to containers where I let the foliage fan outwards to soften the pot edges. In the landscape it associates well with large mossy boulders or as part of a water garden since it thrives in wet soil.
This is a ‘clumper’ rather than a spreader so grows relatively slowly.
Hardiness; zones 5-11
Size; 10′ tall and 18″ wide
Water; average to high
Light; prefers light shade – may bleach in full sun
Mexican feather grass (Stipa tenuissima)
Mexican feather grass after the freeze
Invasive in some states and a fairly prolific self seeder in others Mexican feather grass is not for everyone. In my garden it doesn’t make a nuisance of itself so I can enjoy the wispy texture year round. Soft green blades and tufty white seedheads are fun to place near something sharp or spiky as contrast. Here you can see a Feeling Blue deodar cedar (Cedrus deodara ‘Feelin’ Blue’) to one side which has deceptively prickly needles.
After torrential rain this grass can lay low for while but quickly fluffs up as it dries. The freezing weather does not seem to have affected it at all.
In spring I run my fingers through the clumps to tease out any dried material. If it starts to look really matted I grasp it in a ponytail and trim it down to 8″. It quickly regrows and looks fresh again.
Size; 2′ tall and wide
Light; full sun or part shade
Variegated woodrush (Luzula sylvatica ‘Variegata’)
An under-utilized grass that thrives in dry shade
At first glance this looks just like Ice dance Japanese sedge shown above but it has quite different characteristics. This tough evergreen grass thrives in dry shade where so many other plants struggle. The fuzzy brown seedheads in spring add another layer of interest.
Woodrush looks perfect in a woodland setting – I have let mine colonize under towering Douglas fir trees where it receives only dappled light for a few hours each day in summer. Hellebores, ferns and Japanese maples make great foliage partners. The clumps can be lifted and divided if you wish to propagate them but unlike the sedge, woodrush will not deteriorate if you choose not to do so.
Hardiness; zones 6-9
Size; 12″ tall x 18″ wide
Light; full shade, part shade.
Other good performers
I grow several other evergreen grasses in my garden which are worth mentioning.
Beyond Blue fescue grass
Beyond Blue fescue (Festuca glauca ‘Beyond Blue’) – 2′ mounds of ice blue foliage. Unlike the paler ‘Elijahs Blue’, this cultivar keeps its intense color without browning. I’m fighting the rabbits over this one! I may need to move it into a container.
Orange hair sedge
Orange hair sedge (Carex testacea) – wispy arching blades of olive green tipped in orange make this a fall and winter favorite. I have had mixed results with these in winter but the plants that are in my garden today are stunning, even after three years. A great addition for containers or gardens in full sun or light shade.
One of the many tall, brown-toned sedges
Assorted sedges (Carex sp.) – there are many brown-toned sedges available from ‘Red Rooster’ to ‘Toffee Twist’ and ‘Cappuccino’. All do well in winter here.
What evergreen grasses do you grow that look equally good all year?
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