Design trends

Gardening in Clay Soil

“The soil is made of butterfly wings, dinosaur teeth, pumpkin seeds, lizard skins, and fallen leaves.
Put your hands in the soil and touch yesterday, and all that will be left of tomorrow shall return
so that new life can celebrate this day.” -Betty Peck

California fuchsia tolerates heavy, clay soil.

Soil is a wonderful thing. It grows our food, anchors our trees and provides a foundation under our feet. But it sure can be hard to work with when it’s not the soft, crumbly loam that many plants prefer. It’s amazing that anything grows in some of the soils here in the Santa Cruz mountains. Some folks near Quail Hollow garden in an ancient sea bed of sand and there are others who have such heavy clay in their gardens that you wonder how anything survives.

I used to live up under the trees in Felton where the soil was heavy clay. Now in Bonny Doon, I garden in gritty soil. Both soils have their challenges but I think clay soil is the hardest to deal with. Soil that does?t drain quickly during the winter is especially challenging. Where?s that perfect loam when you need it?

Some soils in Boulder Creek requires a pick ax to break up enough to plant. Sound familiar? Although rich in nutrients, clay soil requires compost to provide the environment necessary for beneficial microbes, worms and other critters could do their work and aerate the soil. A thick layer of mulch spread over the soil helps to preserve soil structure and prevent it from packing down again.

Arbutus unedo growing at the Mendocino Coast Botanical Gardens

There are plants that are tolerant of clay soils but California native plants won?t tolerate standing water for any length of time. They?ll die from either root rot or suffocation as saturated soils prevent oxygen from getting to plant roots. You can plant on a slope where the water is unlikely to saturate the ground around the plant.

Search for native plants that will survive slow draining soils at Calscape- https://calscape.org. Using the Advanced Search tool you can see which plants tolerate different conditions. Enter your address to find plants for all kinds of sun, moisture and drainage situations. I found 48 plants native to Boulder Creek that tolerate slow drainage on the website. From ceanothus to manzanita to California fuchsia to Douglas iris you?re sure to find plants that look great and perform well.

Bergenia cordifolia – a useful groundcover for difficult soil.

There are plants from similar environments in other parts of the world that would also do well if you garden in heavy soil. One of my favorite trees for these conditions is the strawberry tree. Also hackberry, ash, gingko and paperbark trees work well also. Shrubs to try include flowering quince, bottlebrush, Australian fuchsia, smoke tree, escallonia, pineapple guava, mahonia, osmanthus, Italian buckthorn, elderberry and vitex. Easy perennials for clay soils are yarrow, bergenia, carex grasses, fortnight lily, coreopsis, echinacea, nepeta, salvia, teucrium and verbena to name just a few.

If you’re not familiar with some of these plants it’s easy to see what they look like by Googling images. It’s what I do to see a plant full grown and not just a line drawing or a close-up of the flower.

So you see, there are plants that will be successful even in heavy, clay soil, you just have to pick the right ones.

Design trends

Gardening Solutions for Shade

Shade is lovely on a hot day with a lemonade or ice tea in your hand. But what if much of your garden is shady most of the day but then gets blasted with several hours of intense sun during the hottest part of the day? If you?re like me you are always on the look out for plants that can survive these tough conditions. So if your garden falls into this no man?s land of not enough sun for the sun lovers but too much for most shade loving plants here?s what I recommend.

Loropetalum chinense ‘Rubrum’ or ‘Ever Red’

Looking around my own garden one of the plants that does well in sun or shade is Fringe Flower (loropetalum chinense). This handsome evergreen shrub comes in two versions- green foliage with white flowers or burgundy foliage with raspberry flower clusters. Flowering is heaviest in the spring but some bloom is likely throughout the year. You can prune loropetalum to any size but please don’t turn it into a tight ball and ruin it’s shape. Another plus is that it is not attractive to deer.

Liriope muscari ‘Variegata’

Lily Turf (liriope) is another deer resistant perennial I use a lot as a ground cove or at the edge of a path or mixed border. Evergreen grasslike leaves form tufts 18 inches tall. Liriope do well along streams or garden pools and can compete with the roots of other plants like at the base of trees or shrubs. Flower spikes, usually purple, are quite showy. Big Blue is a popular variety that does well in dry shade. Silvery Sunproof has green strappy leaves with gold stripes that age to white.

Heachera ‘Citronelle’

Coral Bells (heuchera) can survive in the shade but can also take that short blast of afternoon sun. There are so many varieties of this perennial these days I hardly know where to start. Whether native or a hybrid their flower spikes are a hummingbird favorite. Colorful foliage, often ruffled or variegated, can be silver, amethyst, caramel or lime green. Combine a tawny variety like ?Caramel? with the chartreuse foliage of ?Citronelle? in front of taller perennials or as a border edging. Coral Bells grow well in containers, too.

Lily of the Valley shrub (Pieris japonica) looks good in shade or sun. An evergreen shrub with year round interest this plant blooms early in late winter though early spring and is covered with little bells for several months. Starting in fall when reddish flower buds appear through summer as the new foliage emerges with a red tint there is always something attractive happening with this plant. It?s deer resistant also.

Hydrangea quercifolia

Oakleaf hydrangea (hydrangea quercifolia) also looks good in shade or sun. Showy leaves resembling oaks, turn bronze or crimson in the fall. Huge white flower clusters bloom in late spring through summer and turn pinkish as they age. They are attractive if left on the plant for the rest of the season.

Among my other favorite plants for these tough conditions are Flowering maple, nandina, Chinese Ground orchid, billbergia, flowering currant, hummingbird sage, spice bush, philadelphus, carpenteria, osmanthus, daphne, hellebore, campanula and hardy geraniums.

Don?t give up if your garden is like mine. There?s a solution for everything.

container gardening

Container Gardening

This simple arrangement features red fountain grass as the
thriller with a sedum spiller.

When I moved up here to Bonny Soon from Felton I brought several hundred plants figuring that with over 2 acres of land I could put most of them in the ground. Many trees and shrubs did get planted but then I ran out of appropriate planting spots and just kept the rest in pots to create a container garden. Naturally, I?ve added more plants in pots ?cause I just can?t help myself when I see a colorful plant that will attract birds, bees and butterflies. My current count of potted plants is 253 so I?ve learned a thing or two about container gardening.

This container grouping for shade has just one type of plants per pot.

Mixed plantings in containers are the most dramatic with a thriller, some fillers and and a spiller or two but when I look around that?s not what I have the most of. Many of my large pots have trees like Dawn redwood, Japanese maples, flowering plums and cherries that I?ve had since the early ?90?s so I might underplant them with chartreuse sedum ?Angelina? or moneywort for a little color but that?s about it. I?ve found that even large trees and shrubs can survive in the same container for many, many years without root pruning or transplanting if they are fertilized once a year and watered thoroughly as needed.

In choosing a container, remember a porous clay pot will dry out fast in the summer sun as will a small pot. If you want pots on a sunny deck, you’ll have better results if your container is made or ceramic or colored plastic and is big enough to allow 2 inches of potting soil around the root ball. I don?t use water absorbing polymer granules in my containers as they are all in shade in winter and would stay too wet depriving plant roots of oxygen.

Water when the top 1 inch of soil in the container is dry. On a very hot day, watering mid day will cool the soil although I like to get my watering done early. Get to know your plants. Plants that are still growing into their containers need less frequent watering than those that are getting root bound. How much water? Water until it runs out the bottom and empty the saucer the next day if any water remains. Use a gentle nozzle that doesn’t dislodge the soil or compact it. Also make sure the water in the hose isn’t hot from lying in the sun.

Plants in containers are watered frequently and the water draining out of the bottom carries away nutrients. That said I have found that I can fertilize everything once a year with an organic all-purpose fertilizer like True 4-4-2. Blooming plants like abutilon, fuchsia, orchids, angel trumpet and the lantana, which I grow because the chipmunks don?t nibble them, receive a water soluble fertilizer once a month. Water soluble fertilizers are fast acting. Dry granules and time release capsules last longer. Organic fertilizers tend to work more slowly and are especially ideal for trees, shrubs and long lived perennials or for large planters in which you keep the same soil from year to year. Be sure plants are moist before feeding. The best fertilizer is the one that you get out of the package and onto your plants.

A group of succulents and cactus at Succulent Gardens in Castroville.

Be sure to use a quality potting mix in your containers. There are special succulent and cactus mixes available but succulents are forgiving as long as the soil drains freely. Don’t add gravel or clay shards at the bottom of the pot as this impedes drainage. It work best to fill the entire pot with soil, top to bottom with a screen over the hole to keep out earwigs and sowbugs.

You can grow anything in a container. Think of them as furnishings. Grow herbs and other edibles near the kitchen door, fragrant flowers to attract beneficial insects, hummingbirds and butterflies, California natives or even plants that glow in the moonlight.

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