Monthly Archives: April 2010

trees

National Arbor Day 2010

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National Arbor Day was founded by J. Sterling Morton in 1872 and is celebrated on the last Friday in April. This year it falls  on April 30th.  The simple goal of this day is to inspire people to plant, nurture and celebrate trees.  So whether you’ve been thinking about planting a fruit tree to feed the family, a shade tree to save on summer cooling, a flowering tree to attract pollinators, or some trees to hang the hammock on this is a good time to plant as well as nurture and celebrate all trees.

Trees are remarkable in how they grow and adapt to their environment.  Some trees, like crape myrtle, sycamore, madrone and cherry have especially beautiful bark. This is the tree’s protection from the outside world. Continually renewed from within, it helps keep out moisture in rain and prevents the tree from losing moisture when the air is dry. It insulates against cold and heat and wards off insect enemies.

The inner bark, or phloem, is the pipeline through which food is passed to the rest of the tree, It lives for only a short time, then dies and turns to cork to become part of the protective outer bark.

The next layer in is the cambium cell layer which is the growing part of the trunk. It annually produces new bark and new wood in response to hormones that pass down through the phloem with food from the leaves.  These hormones are called auxins and stimulate growth in the cells.  They are produced by leaf buds at the ends of branches as they start growing in spring.

Inside the cambium layer is the sapwood or xylem which moves water from the roots to the leaves. Sapwood is new wood. As newer rings of sapwood are laid down, inner rings lose their vitality and turn to heartwood.

Finally, the central supporting pillar of the tree is called heartwood. Although dead, it will not decay or lose strength while the outer layers are intact. A composite of hollow, needlelike cellulose fibers bound together by a chemical glue called lignin, it is in many ways as strong as steel.

Leaves make food for the tree. Their shapes help them reduce wind resistance, shed rain that could decay the leaf if left standing and produce chlorophyll. The narrow needles of a Douglas fir, for instance, exposes as much as three acres of surface to the sun.

There is a tree to please everyone. Don’t have much space for a fruit tree? Consider a Garden Annie dwarf apricot, a dwarf Garden Prince almond, Compact Stella cherry, dwarf Red Sunset nectarine or a Garden Delicious apple.

Rather not have fruit to contend with? How about a flowering crabapple, cherry or plum? Want a deciduous shade tree that grows fast? Red maples with blazing fall color fit the bill.

Need to screen a neighbor quickly? Then plant a honey locust or catalpa. Another fast growing,deer resistant tree is the silk tree.   It’s flat topped, spreading canopy make this a good patio tree and is especially beautiful when viewed from above, as from a deck or hilltop.  If left unpruned it will become a multi-stemmed tree but with training can be grown as a single trunk 10-20 foot umbrella.   Fluffy pink flowers like pincushions bloom in summer.  Grow it in full sun to partial shade.  With regular water it grows fast.  They are attractive to birds, too. 

Be kind to your trees. They are a valuable asset to your home and our environment.

vegetables

Vegetable Gardening in April in the Santa Cruz Mountains

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What’s with all these false starts this spring?  Warm and sunny one week, downright cold with drenching rains the next.  As night and soil temperature warm, newly planted starts and seeds will grow quickly.

Remember that the cool season vegetables include beets, broccoli, cabbage, cauliflower, carrots, kale, lettuce, onions, radish and spinach.  These don’t mind cold soil and chilly weather.
Crops that prefer night temps of 55 degrees and over but will tolerated an occasional light frost are tomatoes bell peppers, corn beans, squash, cucumber, muskmelon and pumpkin.
Distinctly warm weather, long season crops that need temperatures in the 70’s are watermelon, eggplant and chilies.

You can raise the temperature of the soil by laying clear plastic (not black ) over the surface. Protect plants at night with row covers, hot caps, cardboard boxes or anything that will trap heat during the night until temps are right for your crop.

Rotate the beds when planting your vegetables to avoid a build up of diseases and insects that can survive in the soil or on plant residue.  Don’t plant the same or closely related vegetables where they grew in the last 2-3 years. 

Pay attention to the watering needs of each kind of plant, otherwise you might plant high water use vegetables beside ones that need need less water.   This can not only waste water but can actually harm plants.  A good guidelines is to group plants by how big they get and how fast they grow. The bigger and faster they grow, the more water they’ll use.  Plant heavy water users at one end of the garden, light users at the other. For instance, plant shallow rooted beets, bush beans, carrots, lettuce, spinach, radishes and other greens together as they grow at about the same rate and use similar amounts of water.  Corn, cucumbers, melons, tomatoes and squash combine well as they all grow rapidly and need lots of water.  Another tip is not to mix new (successive) plantings of carrots, lettuce and other crops with existing ones as water use changes as the plants mature. 

Vegetables at maturity that root over 48" deep are tomatoes, watermelon, pumpkin, winter squash, asparagus, sweet potatoes, and artichoke.  When watering wet your soil to this depth to keep them happy.  Moderately deep rooting veggies ( 36"-48" ) are beet, beans, carrots, chard, cucumber, eggplant, muskmelon, peas, pepper, summer squash and turnip.  Shallow rooting ( 18" – 24" ) veggies include broccoli, cabbage, celery, corn, garlic, lettuce, onion, parsley, potato, radish and spinach.  Water less if your plants aren’t full grown yet. 

Vegetables in containers are a great solution if you don’t have much space in the ground to devote to them. They warm up quicker in the spring, too. Just about anything that grows in the ground can also grow in a pot or half barrel. This includes vegetables, herbs and seven small fruit trees.

Small plants like lettuces, spinach, swiss chard and herbs grow nicely in smaller pots near the back door while large edibles like tomatoes, peppers, eggplant, squash, cucumbers and melons need more room like a half barrel or large 7 or 5 gallon pots.

It’s important to use fresh planting mix in your containers each year.  Heavy producers  need fresh nutrients and deplete the soil by the end of the season. Also feed your containers for the best tasting fruit and vegetables and water on a steady basis. Skip a day of watering when larger plants are at their peak and you can lose your crop. There’s no such thing as dry-farmed tomatoes in a container.

Growing plants is containers is low maintenance. No weeding required and one of the easiest ways to success.

 

color in the garden, flowering shrubs, flowers, landscape design

Plant Combinations for the Santa Cruz Mountains

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Every spring while driving Hwy 280 on the way to the S.F. Flower & Garden Show, I enjoy the beautiful combination of Western redbuds blooming vivid fuchsia alongside electric blue flower clusters. It’s a sight that always excites me. In early spring there are many other plants that bloom at the same time creating  colorful vignettes. Here are some of my favorites that I’ve used.

Shady gardens come to life when Valley Valentine Lily-of-the-Valley shrub ( Pieris japonica ) is planted in the same area as Bleeding Hearts, Geranium Biokova and Red-leaf Japanese maple. If you’ve never seen this shrub covered with hundreds of rose colored, tiny urn-shaped bells you’ve missed a spectacular sight. The flower buds form in fall and are colorful all winter then open slowly over many months. This plant sails through winter weather, hardy to 0 degrees and is scorned by deer. Even the bark is beautiful on this 5-7 ft evergreen shrub. Add a Red-leaf maple underplanted with pink and white Bleeding Hearts and pale pink Biokova geraniums and your woodland scene is complete.

A beautiful combination for a sunny garden in spring is Spanish lavender Dedication blooming near a Pink Breath of Heaven. Add the strappy leaves of a apricot striped Sundowner New Zealand flax and you’ve created a beautiful addition to your garden.

Sundowner is one of the larger phormiums reaching 6 ft when happy so allow it room and make this your focal point. Lavender Dedication is a stocky 2×3 ft plant that blooms all spring into summer and often repeats if sheared. Short, fat 2" flower spikes have 4 flag-like bracts resembling rabbit ears. Pink Breath of Heaven bears tiny flowers that cover the plant winter and spring and can continue scattered bloom at any other time. The delicate slender leaves are fragrant when brushed or bruised and would be nice along a path where you can enjoy the foliage fragrance. All three of these plants are drought tolerant and deer resistant.

Another nice combo for the sun is Bush Morning Glory planted with Erysimum Orange Zwerg and Echeveria imbricata (Hens and Chicks). If you’ve been wanting to add just a touch of orange to your garden, the dainty 18" tall Orange Zwerg erysimum cooled off with the silky smooth, silvery leaves of Bush Morning Glory is just the ticket. This small mounding erysimum is actually a golden orange and contrasts nicely with the fast growing 2-4 ft Bush Morning Glory. Hens and Chicks in the foreground with their blue green succulent rosettes and loose clusters of bell-shaped orang-red flowers complete the picture. All these are also low water use plants.

When planning, re-arranging or adding to the garden it’s smart to keep plants together that have similar water requirements. That way you won’t overwater and waste water. You still have time to move any plants or shrubs that are in the wrong place. The weather is still cool and they can settle in before the hot weather arrives.  If you have just one plant that needs regular watering among low water use plants you’ll be watering everything more to keep that one alive.  Transplant it to another spot and your water bill will reflect this savings come this summer.