It’s hot, too hot for most of my Seattle garden to handle. Fried astilbe, sunburned hosta and crispy ferns are just a few of my casualties while a semi-naked katsura tree also tells the sad story. I garden on 5 acres without an irrigation system, relying on the inherent drought tolerant properties of plants and occasional watering of selected plants by hand. Being on well water may save us on utility bills but there is a high probability that our well will go dry this year so every drop counts.
Feeling frustrated and disheartened I headed out into the garden with my camera, determined to find something that looked good despite drought and record breaking temperatures. A camera helps me narrow my focus and reduces distractions. Sure enough there are a few things to celebrate.
The overall winners were all my plants with silver leaves.
That’s not really surprising. Silver leaves reflect light and heat. You may notice that many of them are covered with fine hairs such as the licorice plant above. These are an adaptation to water conservation by reflecting light away from the plant. Hairs on the underside of the leaf raise the humidity of the surrounding air and slow down the movement of the air so that water is carried away more slowly. Cardoon leaves have that feature.
Have you noticed how many of these silver leaved plants are also aromatic? Lavender, catmint, Russian sage, culinary sage to name just a few. Interestingly these volatile oils increase the air density and reduce evaporation.
To conserve water loss, plants with smaller leaves also do better in a drought since the surface area is significantly reduced.
These are just a few examples from my own garden this year but you will soon see how they exemplify one or more of these survivor traits. By understanding what has done well I hope to make wise choices going forward since meteorologists tell us this pattern may hold for three or four more years.
Silver Falls dichondra (Dichondra argentea ‘Silver Falls’)
Although just a fun annual for me I was thrilled to see Silver Falls dichondra as a tough, vigorous groundcover when we visited San Diego earlier this year. I love to grow this trailing over the edges of brightly colored containers or hanging baskets. Like strands of exquisite shimmery beads this will bring a touch of class to the simplest design. For me it does equally well in full sun as it does in part shade.
Silver Brocade wormwood (Artemisia stelleriana ‘Silver Brocade’)
I do love the silver foliage of so many wormwood including Valerie Finnis and Silver Mound but have only marginal success overwintering them. My heavy clay soils just don’t drain quickly enough. So after several years of replacing Silver Mound I decided to just buy a few inexpensive 2″ basket stuffers of Silver Brocade. For many this will be a reliable perennial but I’m considering it an annual. However knowing that they would spread really quickly I didn’t mind investing a few dollars for some serious summer sizzle.
I tucked the little plugs in with some white alyssum (either seedlings I’d grown or more 2″ basket stuffers) and have been thrilled with the results. They have only been watered once a week yet have spread at least 2′ in every direction, their felted fern-like foliage adding a bold carpet under its neighbors.
Licorice plant (Helichrysum petiolare)
I’m not generally a fan of growing groundcovers as their presence makes it difficult to add soil amendments such as compost and can even make weeding more awkward. However in the summer I have come to rely on the silver licorice plant to disguise the gaps between young plants, add a silver uplight to darker colors and be a seriously drought-tolerant groundcover from May until late September. I allow a certain amount of free-form scrambling over small shrubs and encourage them to weave between perennials such as black eyed Susan (Rudbeckia fulgida ‘Goldsturm’). One little 4″ plant can spread 3-4′ so that’s a good return on a couple of dollars.
Cardoon (Cynara cardunculus)
Drama? Check. Scale? Check. Pollinator caviar? Double check
My intention was just to show you the huge, coarse, deeply dissected silver foliage of this monster perennial but how could I possibly ignore the blooms, especially when there was a pollinator orgy going on in my garden?! Thistle-like flowers are being produced with complete disregard for drought conditions. Like many plants these cardoon are a little shorter this year due to lack of regular water but that’s OK as they still offer such great architecture to the garden border – and pollen for the bees.
Weeping silver-leaf pear (Pyrus salicifolia ‘Pendula’)
Metallic silver, willow-like foliage is remarkably eye-catching in a mixed border; even more so when on a weeping small tree. It creates a focal point yet highlights other plants from bold conifers to finely textured grasses. It goes well with deep jewel tones and adds a soft touch of romance to pastels.
In its youth the weeping silver-leaf pear can be rather gangly but give it a few years to step beyond adolescence and you will be well rewarded.
White flowers in spring are followed by inedible pear-like fruit but this ornamental small tree or large shrub is all about the foliage. This is one of my favorite plants in the garden.
Catmint (Nepeta species)
I have both Walker’s Low and Little Trudy catmint in this garden and have grown the classic Six Hills Giant previously. I love them all for their fragrant foliage, blue flowers, easy attitude and superior drought tolerance. After blooming I unceremoniously hack them down to a few inches and this is my reward; more flowers and fresh foliage despite no water or fertilizer.
Sea Heart Siberian bugloss (Brunnera macrophylla ‘Sea Heart’)
I don’t have a lot of shade in my garden but where I do you won’t be surprised to learn that it is fairly dry shade. Siberian bugloss seems undaunted by such conditions. Jack Frost does extremely well but Sea Heart is even more remarkable not least of all because of the much larger size of its leaves. Rough to the touch this heart shaped foliage has an intricate overlay of silver on green. Forget-me-not blue flowers appear in spring. This is holding its own under a golden locust tree and is thriving.
Quicksilver hebe (Hebe pimeleoides ‘Quicksilver’)
Just a few miles from here in Christina’s garden Quicksilver hebe is hardy but in my cold, sticky, heavy clay soils I’m happy to use it as an annual or short term semi-evergreen shrub. The color and texture are easy to blend with bolder, brighter offerings in the landscape and I know this can take both the heat and low water. I’ve been especially glad of it this year although its color leans more towards a pale teal than true silver
Elsewhere in the garden are assorted lavender, Silver Shadow astelia and the new Bella Grigio lambs ears; all thriving in our crazy summer.
As a bonus all the plants listed here have proven deer resistant in my deer-ravaged garden
Take a few moments to look at your own garden and assess what looks good right now despite your particular gardening challenges. Tell us about it in the comments below or post a photo to our Facebook page; we’d love to hear your news.
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