Monthly Archives: June 2022

Design trends

Kurapia Groundcover Saves Water

Kurapia ground cover combined with chodropetalum ‘El Campo’.

A couple months ago I had the pleasure of visiting some incredible gardens in Palo Also. After a hiatus due to Covid, the Gamble Garden Tour did not disappoint. With so many garden styles to take in, I came away with inspiration and lots of ideas for low maintenance and low water landscapes. One of my favorite gardens showcased kurapia ground cover over most of the front yard.

Kurapia is a deep rooted, low water use, low maintenance ground cover. Its parent is in the Lippia genus and has naturalized worldwide. However, Kurapia has been bred to have sterile seeds and its growth habit is much more compact and tamed. Though it is sterile with respect to seed production, it does flower and is bee and butterfly friendly, blooming from May to October. This is a good groundcover if pollination of nearby fruit trees is needed or your want to encourage bees in your garden for general pollination. If bees are an issue for someone in your family Kurapia can be mowed once or twice a month to cut the blooms off. Mowing benefits this groundcover making it grow denser which naturally surpasses weeds once it fills in.

Kurapia has been extensively studied at UC Davis and UC Riverside comparing it with No Mow as well as other drought tolerant cool and warm season grasses. Kurapia exceeded them all going 52 days without water and still maintained its green color. An extensive root system that goes as deep as four feet and a dense 2” to 3” tall mat-like top is the secret. The California sod grower recommends more frequent irrigation but it still requires just 60% of the water of a traditional lawn.

Kurapia does not require much fertilization either. One time in the spring for growth and flowering and once in the fall to keep the green color through the winter is sufficient. Kurapia is evergreen and does not have a dormant period though growth stops or slows does in the winter. It spreads and self repairs by stolons. This groundcover grows in sun to partial shade requiring only three hours of sunlight. However it tends to stay more compact in full sun.

Kurapia will handle light to moderate foot traffic. It cannot take consistent high traffic though it is very walkable.

Kurapia is hardy to 20 degrees though in tests it has survived temperatures as low as 12 degrees. Its deep root system is unparalleled for erosion on slopes. Did I mention it takes 60% less water and how much you mow is up to you?

If you’ve been thinking of replacing your lawn or part of it anyway to save on water and maintenance, this is a good time if you live in Scotts Valley. Starting June 1st for a limited time, the district has increased their rebate to $2/square foot. Replace your lawn with low water use plants and ground covers or hardscaping and convert your sprinklers to drip at the same time. Visit their website for more information.
www.slvwd.com/conservation/pages/rebate-program

Design trends

Summer Solstice Garden Tasks

Prune new growth to within 6 inches of the main branch to control size and keep
size in check.

Summer solstice, the official start of summer, sneaked up on me. The warmer weather has been here off and on for a couple of months so it’s not just the weather. It’s those darn pesky pests on my plants that are bugging me. You’d think me, of all people, would not let something get away from me but alas, I have a spider mite problem that is giving me nightmares. Don’t let this happen to you.

I’ll have to heed my own advice from now on. Stroll your garden regularly with a beverage of your choosing and just look at your plants. Are the leaves discolored or have holes? Yellow? Stippled? Dropping off? Limp? If so then go in for a closer look and identify the problem early.

I’m OK with a few holes here and there but a heavy infestation of pests should be trimmed off or sprayed with an organic insecticide .I inspect the tips of my fuchsias regularly for fuchsia mites and clip off any distorted growth. I hate to spray even organics on fuchsias due to the hummingbird activity. Lately I’ve seen rose slugs making lace out of the leaves so I crush by hand or spray with an organic.

Many plants, both vegetable and ornamental, are bothered by aphids and other sucking insects as well as foliage and flower eating bugs. From cucumber beetles, flea beetles, stink bugs, weevils, curculios to borers , the list of trouble makers is endless. To help deter them mix up some pepper spray in your kitchen.
1 tablespoon hot pepper sauce or 1 teaspoon cayenne pepper
6 cloves garlic, crushed
1 quart warm tap water
Let stand I hour, strain and spray plants either in the morning or evening.

When the last flowers of your rhododendron, azalea, camellia, weigela and spirea have finished it’s time to prune them. If you prune too many months after flowering your risk removing the flower buds forming for next year. Basically it’s best to prune lightly each year to shape plants that have become too leggy. The rules apply to most plants. Prune to the next whorl or set of leaves. To increase rhododendron bloom next year, break off any faded flower trusses just above the growth buds being careful not to damage the new buds.

Apply the second fertilizer application for the year to your citrus and fruit trees. The final one for the season should be immediately after harvest. Apply the fertilizer to the soil around the drip line of the tree where feeder roots are located and scratch into the surface. Water in well. As with all fertilizers, make sure the trees are moist before you fertilize. Young trees in their first, second or third growing season should receive half the rate of established trees.

Another garden to-do this month includes summer pruning of wisteria. To increase flowering next spring and keep these vines under control cut new growth back to within 6″ of the main branch. If you want to extend the height or length of the vine, select some of the new streamer-like stems and tie them to a support in the direction you wish to train the plant.

While I have the pruners out I’ll be shearing back early flowering perennials to encourage another round of blooms. The season has just started and you’ll be enjoying lots more flowers in the months to come if you deadhead regularly. Perennials and shrubs that benefit from trimming an inch or two below the spent blooms are erysimum, lavender and pink breath of heaven which will keep them compact.

Design trends

Butterflies in the Garden

Butterfly Bush attract many kinds of butterflies including Western swallowtails.

I live on Boulder Creek where the steep banks are covered with blackberries. The Himalayan blackberry has choked out the native species here but the swallowtail butterflies visit the white flowers regularly to harvest nectar. Later in the summer they will relish the ripe berries. Although I wish the blackberries were the native Pacific blackberry I do enjoy the birds and butterflies that enjoys them.

Summer butterflies live only for a week or two. During that time the butterflies mainly search for food and a mate. They have a keen sense of sight, smell and taste. Having large eyes they can see many colors including those in the ultraviolet range that we can’t see. Many flowers have ultraviolet patterns that butterflies find especially attractive. Butterflies can detect movement better than we can. If you’ve tried to get a photo of one in your garden you know how hard it is to sneak up on one.

In addition to chemical receptors on their antennae, butterflies can taste food with their tongue and even their feet. They have thousands of dusty scales that cover their wings and body and absorb heat. They can make their wings tremble to speed up the warming process and even orient their wings to the sun to absorb heat more quickly.

We have about 90 species of butterflies in the Monterey Bay area. Many of these occur only in our mountains, forests and chaparral environments. They are easy to attract and make a permanent feature in your landscape. Here’s how.

A butterfly garden should include plants that accommodate all stages of the life cycle – egg, larvae, pupa and adult . When both adult nectar and larval host plants are available, they will attract and support a butterfly population. In addition to the right plants, your garden should also have sun, a water source, protection from wind and plants in clusters. When maintaining your garden avoid the use of insecticides, including BT.

Mophead hydrangeas have sterile flowers with no pollen but other varieties do attract butterflies.

As adults, most butterflies feed on the nectar of flowers. Some local butterflies, like the Mourning Cloak and Red Admiral, feed primarily on rotting fruit or tree sap for moisture and nutrients while the California Sister feeds on aphid honeydew.

In the larval stage, most butterfly species are limited to a single plant family and occasionally a single genus. To attract more Western Tiger Swallowtails, for instance, provide larval host plants such as willow, sycamore, alder, big leaf maple, sycamore, plum and ash. Common Buckeye lay their eggs on mimulus and verbena while California Sister use the coast and canyon live oak. Planting a variety of grasses and shrubs like ceanothus, buckwheat, coffeeberry, bush lupine,manzanita and perennials like redwood violet, California aster and wallflower will attract a variety of local butterflies. If your garden is near a wild area that naturally supports the caterpillar stage, you can plant just the nectar plants to attract butterflies to your garden.

Filling your garden with nectar producing flowers is the fun part. Adult butterflies rely on sugar-rich nectar for their daily fuel. Different species have different flower color and shape preferences. Many butterflies produce scents that attract the opposite sex and many of these scents smell like the flowers that they are attracted to and visit. The scent of these butterfly-pollinated flowers may have evolved as an adaptation to ensure their survival.

Butterflies typically favor flat, clustered flowers that provide a landing pad although larger butterflies can feed on penstemon and salvias while hovering. Unlike bees, butterflies can see red and are attracted to brightly colored flowers. Pink, red, orange, yellow and purple are the most attractive nectar source flower colors but they also use blue and white.

Consider the blooming time of each plant. Having plants blooming in the sun for many hours in the day will lengthen your viewing time. Nectar rich flowers include yarrow, aster, verbena, scabiosa, buckwheat, toyon, salvia, erysimum, zinnia, lantana and coneflower.

In addition to nectar, butterflies need a source of water and salts. A patch of mud kept wet year round or a shallow depression lined with pebbles and kept moist will work fine. Also provide some flat rocks for them to bask in the sun in an area protected from the wind by shrubs.

Having a garden filled with birds, bees, butterflies and other pollinators is fun and easy.

Design trends

Finding Color in the Shade Garden

Recently I spent some time in a friends’ garden in Bonny Doon. This garden is so spectacular is was on the Valley Churches garden tour several years ago when Bonny Doon gardens were featured. As in many gardens there are some sunny spots as well as lots of shade under porch overhangs and trees. My friend Kate has managed to have as much color in her shade as she has in her sunny spots.

Perfect for pots, Shooting Star hydrangea re-bloom.

Blooming wildly on Kate’s shady porch are several Shooting Star hydrangeas. Very hardy and reblooming, hydrangea serrata reach only 24 inches high and wide and so are perfect for small spaces and pots. This small shrub would be the “thriller” in a pot. It blooms on new wood and old wood so repeats all summer. I took away several cuttings of this as well as traditional mophead hydrangeas so start my collection again.

Also called Queen’s Tears, billbergia are reliable growers in dry shade.

Every spring, before the fire, I would look forward to the unique flowers of my Queen’s Tears billbergia. Recently a fellow gardener gifted me a variegated one so I could carry on the tradition. This pineapple relative makes a vigorous, deer resistant groundcover under trees without becoming invasive. Exotic looking rosy-red spikes are topped with drooping pink, blue and green flowers that look like dangling earrings. Insects never bother them. Give them a little water now and then and forget them. They’re that easy to grow.

The sound of rustling leaves is soothing to our ears. But many of the ornamental grasses that sway in the breeze don’t survive in shady locations. One that does is Japanese Forest Grass. There are several varieties of hakonechloa that can brighten a dark spot by your favorite lounging chair. Aureola has the classic bright gold and lime green striped leaves. I love the way each graceful leaf tumbles toward the light reminding me of flowing water. Also called Sweet Grass they are relished by my cat.

Looking for shade tolerant flowering shrubs to cut for bouquets? Fragrant daphne odora is a wonderful small shrub. Sweet olive or osmanthus fragrans is a large evergreen shrub or small tree with blooms that smell like apricots in winter. For summer fragrance grow Carol Mackie or Summer Ice daphne.

Flowering plants to grow in dry shade areas include bergenia, mahonia, fragrant sarcococca and clivia, Viburnum ‘Mariesii’. Oakleaf hydrangea foliage and flowers look great in bouquets and the leaves turn red in fall which is an added bonus.

Chinese Ground orchid attract hummingbirds.

Chinese Ground Orchid ( Bletilla striata ) is another of my favorites plants for shade. A natural companion for ferns and wildflowers, this plant is tougher than it looks. Vivid, magenta blooms resembling small cattleya orchids emerge on long stalks for about 6 weeks in the spring.

Clivia miniata

For dry shade try growing Kaffir lily ( clivia miniata ). I’ve got a bright orange blooming Belgian Hybrid I hope to have many clivia in the future as they divide so easily and bloom in fairly dark shade. Beautiful, robust green strappy leaves are handsome year round but the dozens of flowers clusters, some containing as many as 60 flowers each, brighten up any area. Drought tolerant once established they make a gorgeous accent, border or container specimen.

Sure, every garden is different- different look, different soil, different degree of shade, but it’s surprising how often one of these plants plays a starring or supporting role in a vignette or border

I use all of these tough plants in designs for shady gardens because I know they will thrive, look beautiful and provide color. If you have a garden that gets little winter light these are the plants for you. Those of us who live under the trees know a shady garden is a pleasant place to spend time on a hot summer day. Be thankful for what you do have.