Category Archives: groundcovers

How to Design a Perennial Border

rhododendron_occidentale2.1600When I visit my best friend’s house I park next to the perennial border that lines her driveway. At any given time of year there is something blooming, flowers filling the air with fragrance and juicy apples hanging on the tree for picking later in the summertime. She has some California natives as well as traditional cottage garden plants all mixed in together. Originally from Illinois, she loves a garden filled with lush green and color but has designed the space with plants that can use less water than you would expect and still look spectacular.

What makes for a successful border? You see DIY articles in the gardening magazines showing lovely combinations with rules to follow but they always seem to be for a different climate or location. We often have borrowed scenery from the mixed woods and some of their ideas just don’t work well here. Here are some tips for planting a terrific perennial border in our neck of the woods.

Some of the key players in my friends perennial border are natives like Western azalea, kerria_japonica2hazelnut and flowering currant. These are large, woody shrubs that add height, texture and year round interest. They provide the backbone or structure to the border throughout the seasons and even in the winter. She also has a weeping bottlebrush which is evergreen and provides nectar for the hummingbirds as does the flowering currant. An apple tree and a persimmon tower over all the other plants creating a canopy for the shrubs, herbaceous perennials and groundcovers. You could also plant spirea, weigela, cornus and viburnums to provide structure to your border.

My friend’s border is planted so that there is something of interest every month during the growing season. The persimmon tree is the star of the late fall garden with bright orange fruit that hang like ornaments on the tree. In the spring I can’t take my eyes off the kerria japonica whose graceful shape is covered with double golden, pom pom shaped flowers. The vivid, new foliage of the Rose Glow barberry complements the stand of Pacific coast iris with similar cream and burgundy flowers blooming next to it.? Under the bottlebrush a sweep of billbergia nutans or Queen’s Tears is flowering with those exotic looking, drooping flower clusters. They make a great groundcover under the tree and also are long lasting in a vase.

ompholodes2.1600Mid-sized filler plants that thrive in this border include Hot Lips salvia, daylilies and polemonium to name just a few. Daffodils and tulips have naturalized throughout the space. Groundcovers grow thickly to shade the soil and prevent precious moisture evaporation.? Lamb’s ears like their spot under the flowering currant and the omphalodes have spread throughout the border. This little plant looks and blooms like the forget-me-not but the delicate deep blue flowers don’t produce those sticky seeds that plague both our socks and animal fur.

This border get morning sun and mid-afternoon sun until about 3pm. If you have a situation that calls for all sun lovers you could try asters, shasta daisy, grasses, coreopsis, achillea, echinacea, gaillardia, sedum, kniphofia, lavender, liatris and rudbeckia.? Perennials that work well to attract butterflies and hummingbirds include monarda and my personal favorite, cardinal flower.? Both have long, tubular flowers in bright colors such as red, orange and yellow. it’s easy to have the birds and butterflies coming all season when you plant perennials with overlapping bloom times.

Perhaps some of these plant combinations would look great in your garden, too. Just don’t worry too much about the “rules” of perennial borders. Mix it up. You don’t want the border to look like stadium seating. The idea is to have fun and create a border that makes you happy.

What to Do about Invasive Plants

bull_thistleWe can't control those pesky weed seeds that blow into our gardens and take hold. There are ways to keep them from taking over, however. But what about those invasive plants that are already in our gardens like ivy and vinca major? What's the best way to deal with them? Then there are plants we buy ourselves that can invade natural areas. Are there better plants to use that are just as attractive and useful? Here are some solutions to make your garden happy.

One invasive thug that can take over is bull thistle, a relative of the edible artichoke. The seeds of this vigorous exotic take hold in disturbed areas including your beautiful garden soil and if not controlled can become a solid mass of impenetrable thistles in just a few seasons. Bull thistle only reproduces by seed so removal of the flowering stalks at this time of year will prevent them from spreading. The flowering heads must be discarded in a plastic bag and destroyed to keep them from forming viable seed. Because this weed is biennial you also need to dig out the first year plants that have not formed stalks. You can also mow thistles close to the ground a couple of times before they form stalks to reduce the population over time.

As a landscape designer and consultant I'm often called upon for advice for an area covered with vinca major or ivy. Both of these invasive species are too successful for their own good, smothering native plants and harboring pests such as rats and snails. Vinca major also serves as a host to the bacteria that causes Pierce's disease in grapevines. For your information, vinca minor has not been found to be invasive in California so far

You can choose organic methods to control vinca and ivy rather than chemical herbicides. Hand vinca_majorremoval is labor intensive but the results are good if all the root nodes and stolons are removed. Work inward from the perimeter of the patch and pull the plants back. You will need to do this every 3 months during the first year to remove resprouts but native plants may recolonize the area and reduce the chance that other weeds will move into the area following the disturbance caused by the removal activities.

Replanting with another more desirable groundcover is another solution. For shady areas, try planting wild ginger  (Asarum caudatum), Catalina perfume ( Ribes viburnifolium), creeping snowberry ( Symphoricarpos mollis), yerba buena ( Satureja douglasii ), bear's foot hellebore (Helleborus foetidus), winter saxifrage (Bergenia cordifolia), pachysandra, Serbian bellflower (Campanula poscharskyana) or Asian jasmine.

Good substitutes for vinca or ivy in sunnier spots include groundcover types of manzanita and ceanothus. Also attractive are Taiwan raspberry (Rubus pentalobus), California fuchsia (Zauschneria), or beach strawberry (Fragraria chiloensis ).

Some plants even though purchased from a nursery can cause problems. You wouldn't buy a Scotch or French broom knowing how invasive they can be. Forsythia, Japanese kerria, golden currant and Jerusalem sage all provide that beautiful spring butter yellow color in the garden.

The licorice plant (Helichrysum petiolare) gained popularity for its deer resistance and foliage color many years ago. Unfortunately, it self sows wildly and the spreading branches will root at any point of contact with the ground. Try instead better behaved plants like California natives salvia leucophylla or eriogonum giganteum. Teucrium germander or Powis Castle artemisia also work well in the same area.

Another good plant gone wrong is cotonester  lacteus (parneyi).  The red fall berries are spread by cotoneaster_lacteus_Parneyibirds and with their rapid growth and competitive roots they can overtake the garden and wild areas. Fortunately there are many other plants to use instead that provide food for birds and are beautiful, too. Try planting toyon (Heteromeles arbutifolia) a California native with delicate white flowers and large clusters of brilliant red berries. Pineapple guava is another good substitute as is strawberry tree (Arbutus unedo).

These are just some of the suggested alternatives for invasive garden plants for this area. Don't give an invasive an inch, it can take over your garden, the neighbors and our wildlands.
 

Colorful Plant Combinations for the Santa Cruz Mtns

Fall is the perfect time of year for many things– long drives, walks in the forest, beautiful sunsets. It's also a great time of year to transplant those plants in your garden that aren't in quite the right place and to create new exciting combinations of foliage, color and texture that are just perfect.

I"m always newly inspired when I see common plants combined in ways I hadn't thought of. Some vignettes are simple repetitions of just two plants while others might include 3-4 plants with different characteristics. A recent meeting of APLD ( Association of Professional Landscape Designers ) of which I am a member, showcased fabulous ideas for plant combinations. In addition to these plants looking great together visually they share the same cultural requirements which is a must. No sense planting a water-loving partial shade plant next to a low water use plant that requires full sun.

Here are some of the awesome plant combinations from gardens I have designed and from fellow designers that I think are particularly appropriate for our area.

In a sunny garden colorful flowers surrounded by soothing green foliage creates a space to linger. The hummingbirds and butterflies attracted to the nectar of the flowers are an added bonus. The plants that create this beautiful scene combine strong, linear leaves from phormium 'Amazing Red'  with the golden foliage of abelia 'Kaleidescope'. Bright red and white flowers of the hummingbird-magnet salvia 'Hot Lips' combined with the soft green needles of grevillea lanigera 'Mt.Tamboritha' and the salmon pink flower spikes of phygelius (Cape Fuchsia) invite you to sit awhile in this garden.

Plant combinations that echo each other in color work well together. Think of the famous White Garden at Sissinghurst Castle in England. Phormium 'Cream Delight' looks great with so many plants the combinations are nearly endless. Consider growing it with Elijah Blue fescue grass and surrounding the group with a hardy groundcover like the succulent semperviven ( Hens and Chicks ).

Silver or grey foliage always looks smart when paired with pink shades.  Again that go-to plant that adds architectural interest, Phormium 'Evening Glow', provides the pink element with bronze edged leaves with red centers as does the dusty rose color of Sedum 'Autumn Joy' flower clusters.  Add the silver foliage of euphorbia wulfenii ' Glacier Blue' and Russian sage to complete the look.

Another group of plants that combine well have flowers of similar color. Hardy geranium 'Rozanne' with violet blue flowers pairs well with the soft blue ground morning glory, lavender-blue flowering catmint and penstemon 'Blue Bedder'. These perennials all grow in full sun but can tolerate some shade and like moderate watering.

Other combinations that might look great in your own garden include natives mimulus, juncus patens and deer grass with Pacific wax myrtle.  Or try growing Verbena lilacina 'De La Mina' alongside the blue tones of festuca californica. Under native oaks, heuchera maxima along with iris douglasonii won't require much summer water which will make the oaks happy too.

At this time of year I'm always drawn to combinations with warm, rusty tones. Purple smoke bush fall foliage pops when combined with gold flowering rudbeckia Goldsturm and purple coneflowers. Or how about Apricot Sunrise agastache growing with Spanish lavender and Big Ears lamb's ears?  Then again you might like the gold flowers of Harmony kangaroo paw blooming for months alongside Carex testacea (Orange Sedge).

Shady spots needing some pizazz could look to the huge leaves of bergenia 'Bressingham Ruby' with their brilliant magenta late winter flower spikes and combine it with golden yellow sweet flag (Acorus 'Ogon'). Another combination I like for the shade is asparagus spregeri and blue flowering Dalmation Bellflower groundcover.

Whether you're transplanting existing plants in new exciting combinations or creating new ones, fall is a great time to spend time in the garden.