Winter is a great time to daydream about future gardens — the garden that could be or the garden of your dreams.
Soon, it'll be time to prune the roses. The fruit trees are there, just waiting for dormant spray and a little winter pruning, and those tangled vines beckon you every time you walk by.
But for now, why not let your imagination go wild and consider adding a green wall to enjoy while you sit on the patio this summer.
While I was up in the Pacific Northwest during Christmastime, I had the opportunity to visit two impressive green walls.
Also called living walls, they got me thinking about the wall behind the patio table on my deck. It would look just awesome covered with living plants.
Much of the cost of a large green wall installation is for an irrigation system that allows for easy maintenance, but because I'm willing to water by hand every few days, my wall will be an affordable version.
First, though, some inspiration.
Goodwill green wall
The first wall I visited was a 20-by-40-foot living wall at the Goodwill-Milgard Work Opportunity Center in Tacoma, Wash. The wall was designed by the famous French inventor of modern green walls, Patrick Blanc, and was literally dripping with plants, moss and raindrops on the day I visited.
Installed in 2009, the diagonal swaths of plants are inserted into a double layer of felt that is slit to make planting pockets. Most of the soil was knocked off small 4-inch plants, even the woody plants. I read that Blanc used 96 species initially, but only the toughest have survived.
It was December when I visited, and some of the plants were dormant, but those remaining were quite colorful and made a beautiful tapestry.
Stripes of golden acorus grew beside ribbons of bergenia, artemisia, euphorbia, rubus, carex grass, Asiatic jasmine, thyme, pachysandra and Vinca minor. Bands of variegated iris high up on the wall caught my eye, and I marveled at the woody lily-of-the-valley shrubs and skimmia that remained small in this environment.
A drip irrigation system runs across the top of the wall and in a horizontal band halfway down. Water and fertilizer drip through the felt to keep the plants perpetually moist and nourished -- similar to the mossy cliffs where many of these plants grow in their native environments. There's a freeze switch to stop the irrigation on the coldest days to keep the wall from turning into a solid wall of ice. I was told that the wall is pruned twice a year via a cherry picker.
Amazon living wall
The second living wall I visited in Seattle covered a new building outside the new Amazon.com Inc. offices.
This green wall is constructed on a vertical metal grid that supports square modular trays. The plants grow lush in soil pockets, with micro-spray irrigation providing moisture and nutrients. The effect is beautiful to look at and experience.
Winter chill made the plants pop with bright colors as well as glow with deep gold, burgundy red, acid green and tawny auburn.
Diagonal bands of familiar hardy plants such as Carex buchananii, Lowfast cotoneaster, iberis, star jasmine, Powis Castle artemisia, liriope and ferns drew my eye up, down and sideways.
The wall encloses a small plaza with warm wood and concrete seating, which would be inviting to sit and stay awhile on a warm day.
Bringing it home
The plan for my own living wall is to mimic the look of the Tacoma green wall with Woolly Pocket planters made from recycled plastic bottles. They're the simplest and lightest to use.
For clients, I suggest an outdoor wall near the kitchen planted with rosemary, oregano, thyme, parsley and other sun-loving herbs.
Or, in a super-shady spot, the pockets could be planted with hardy houseplants, such as spider plant, creeping jenny, queen's tears, small ferns, wandering jew and creeping charlie. These have all survived at my house under the overhang for more years than I can count.
I'm looking forward to putting together my own green wall. I may even grow succulents in a frame in another spot. It's an easy, fun project to enhance your time outdoors, and I plan to suggest this design solution whenever possible in the future.
Take the time to day dream about something new and fun for your own garden.
- Jan Nelson, a landscape designer and California certified nursery professional, will answer questions about gardening in the Santa Cruz Mountains. Email her at firstname.lastname@example.org, or visit www.jannelsonlandscapedesign.com to view past columns and pictures.