Horticulturists are by nature, nonconforming. I happen to find it difficult to conform to what makes us nonconforming. Trends are fleeting. Old technology that has worked for decades or centuries is still best. Although I am not totally against chemicals, I find that almost all are unnecessary for responsible home gardening. Pruning is underappreciated, and fixes many problems.
It is looking a bit more like autumn as a few more species respond to cooling weather by discoloring or deteriorating before defoliation.
1. Hosta plantaginea, hosta is really looking shabby now. Actually though, it never really looked all that good. The difference is that this shabbiness is because of cooling weather.
2. Plectranthus scutellarioides, coleus, which looked so splendid for Six on Saturday two weeks ago, is beginning to succumb to cooling weather, as is typical for this time of year.
3. Acer palmatum, Japanese maple, which was still green for Six on Saturday two weeks ago, is now beginning to yellow in response to cooling weather, as it should for autumn.
4. Acer palmatum ‘Bloodgood’ Japanese maple was already bronzy red, but is beginning to turn a bit brighter red because of the cooling weather. Its color may linger for a while.
5. Metasequoia glyptostroboides, dawn redwood is likewise beginning to yellow because of cooling weather. It eventually turns brown while all the other redwoods remain green.
6. Rosa, carpet rose is the only one of these six that is not responding to cooling weather as it produces a few rose hips. I did not expect this. Rose hips are rare in our landscapes.
The thick clumps of evergreen grass-like foliage of mondo grass, Ophiopogon japonicas, make a nice lumpy ground cover for small spaces. Because it is rather tolerant of shade, and actually prefers partial shade to full sun, it works nicely under Japanese maples or highly branched overgrown rhododendrons. It gets only about half a foot deep. Narrow stems with small pale purplish blue flowers that bloom in summer are not too abundant, and are generally obscured below the foliage, but can actually get taller. ‘Silver Mist’ is variegated with white.
New plants are easily produced by division of large clumps. Overgrown or tired looking clumps can be shorn down at the end of winter, before new growth begins. Slugs and snails can be problematic.
Pasadena sustained the worst of the damage caused by the strongest Santa Ana Winds in three decades. Huge piles of debris from broken trees are much more than can be removed any time soon. Falling debris and trees damaged many roofs, cars and anything else that happened to get in the way.
Other towns and neighborhoods throughout the area, particularly those at the base of mountains, also sustained major damage. At the same time, severe winds ravaged the San Francisco and Monterey Bay Areas as well, particularly in the Santa Cruz Mountains and the hills of the East Bay.
Some of the damage caused by wind in urban areas might have been less disastrous if trees had gotten the respect and attention that they deserve. Some trees develop structural deficiencies that need to be corrected by pruning, either to eliminate the problems, or at least to decrease the strain exerted onto the structurally deficient parts. A few trees that become unstable as they mature may likewise need to be pruned or even removed.
It is not always possible to prune trees to remove all structural deficiencies without damaging the affected trees more, or causing more structural problems to develop. For example, major pruning to remove all parts that may get blown down by wind, such as pollarding or ‘topping’, may seem to be effective for the short term, but actually stimulates the development of vigorous secondary growth or watersprouts that are disproportionately heavy and even more likely to tear off from the older limbs.
Structural pruning more often involves thorough reduction of weight and wind resistance. Weight of foliage and stems directly applies leverage against unions where smaller stems are attached to the larger stems from which they originate. Wind resistance adds more leverage as foliage gets blown about by wind. Thinning obviously removes significant weight, and also decreases wind resistance to allow wind to blow though the affected canopies.
Besides helping to compensate for structural deficiency, structural pruning is also beneficial to potentially unstable trees for the same reasons. However, unstable trees typically need even more reduction of weight and wind resistance. Some of the most unstable trees and those that are deteriorating need to be removed because their instability cannot be accommodated.
During winter, while deciduous trees are bare, evergreen trees are more susceptible to wind damage, obviously because they retain their weight and wind resistance through winter while the weather is the most severe. Unstable trees become even more destabilized as rain softens the soil. Regardless of the potential for susceptibility to wind damage, this would be a good time of year to get any needed tree maintenance done, prior to any more windy and rainy winter weather.
Arborists certified by the International Society of Arboriculture are the most qualified to identify potential structural problems or instability, and to prescribe corrective procedures. A list of certified arborists can be found at the website of the International Society of Arboriculture at http://www.isaarbor.com.
Redwoods give new meaning to stumperies. Their stumps are massive, and remain intact for decades. After all, coastal redwoods are among the largest trees in the world, and their wood is famously resistant to decay. Although redwoods had been harvested here for a very long time, most were harvested soon after 1906 to rebuild San Francisco after the Great San Francisco Earthquake and Fire. The stumps of some of them were subsequently hollowed by forest fire in the 1950s. An outhouse at home was built on top of one such hollow stump. A showers was built within another. A third is big enough to be built into a guest cabin. Stumps at work are not so useful, so remain only as monolithic garden sculpture. One short stump was planted with Billbergias a few years ago. More recently, we installed a few Cymbidium orchids on one short stump and one taller stump. The taller stump is about five feet wide and about eight feet tall, so looks rather silly with a pair of relatively small orchids protruding from the top. The orchids could be happy there, though. They should fill out and become more proportionate to the stump that they inhabit.
It lacks the spectacular spring bloom of the other deciduous fruit trees, but compensates. Persimmon, Diospyros kaki, performs double duty with fall color. Its autumn foliar color is impressively fiery orange. Then, it defoliates to reveal plump, abundant and comparably fiery orange fruit. So, it is spectacular with both autumn foliar color and autumn fruit color.
Persimmon trees are tempting. Some cultivars can grow twenty feet tall to become small or even mid sized shade trees. However, if they do so, much of their overly abundant fruit is unreachable. Aggressive and strategic pruning limits their production with most of their fruit in reach. Although undemanding otherwise, this major dormant pruning is important.
Persimmons are self fruitful without a pollinator. However, they supposedly provide more fruit of better quality with another cultivar. Fruit is unfortunately inedible before thoroughly ripe, but then all ripens simultaneously. That is an incentive to share with neighbors and friends. With a bit of effort, fruit is conducive to drying and freezing, although not canning. Ripe fruit is very perishable.
Arboriculture becomes more of a concern at this time of year. Although winter is a month away, the weather is becoming increasingly stormy. Wind and rain can dislodge limbs or destabilize entire trees. Some trees may benefit from winterization prior to even stormier weather in the future. Some may need the specialized services of professional arborists.
Dormant pruning of deciduous fruit trees is, incidentally, not the same as winterization. It happens later in winter, after the subjects have been dormant for a while longer. Besides, after proper dormant pruning last year, they should not need winterization now. However, if subjects are defoliated, they should not mind early pruning. They are already dormant.
Ironically, the trees that are more likely to require winterization are evergreen. Deciduous species perform almost all of their own winterization naturally. They defoliate to eliminate most of their resistance to wintry winds. In other words, they become more aerodynamic. Defoliation also eliminates most of the surface area to accumulate heavy water from rain.
Evergreen species are generally more resilient to wind than foliated deciduous species. However, as deciduous species defoliate, evergreen species can not. Evergreen foliage therefore becomes less aerodynamic and more vulnerable to wind. Also, it absorbs more heavy rainwater. The added weight of rainwater causes limbs to sag and perhaps break.
Rain does more than cause foliage to become heavier. It also saturates soils, which can potentially compromise root stability. The timing could not be worse, since wind typically accompanies rain. This is also more of a problem for evergreen species than deciduous species. However, some storms arrive early, and some deciduous species defoliate late.
Winterization pruning is as variable as the trees that benefit from it. Large trees will likely need specialized services that only arborists can provide. Japanese maples may require only minor clipping of stems that have extended too far. Many trees require nothing at all. Ultimately, such techniques should help limbs and trees survive eventual wintry weather.
Flowers are starting to succumb to cool and rainy weather. So, it is beginning to look like autumn here. Summer is truly over.
1. Pelargonium X hortorum, zonal geranium is finally starting to look somewhat shabby after the recent rains, although several others continue to bloom as if nothing happened.
2. Rosa spp. ‘Iceberg’ rose is probably the last rose to bloom for the season. A few young floral buds are molding before they bloom. The roses get pruned before New Year’s Day.
3. Tagetes patula, French marigold is more seasonable. It is expected to bloom through autumn, and could continue until replacement with warm season annuals during spring.
4. Abutilon X hybridum, flowering maple does not seem to know when to stop blooming for autumn. Its bloom should probably decelerate now that the weather is getting cooler.
5. Rhododendron spp., azalea is even more confused than the ‘Duc de Rohan’ azalea that bloomed not so long ago. It is blooming more abundantly and even later, or not so early.
6. Rhody curls up somewhat tighter while the weather is cool. His fur should get fuzzier, but does not seem to be doing so. He insists on coming to work with me, out in the cold.
Candelabra tree resembles cacti, but is not related.
The weirdly sculptural succulent stems of candelabra tree, Euphorbia ingens, dark green but devoid of any real foliage, are striking in the right situation. These stems resemble those of unrelated cactus, with longitudinal ridges topped with spines. Although botanically interesting, the minute greenish yellow flowers that bloom in autumn and winter on the ridges of the upper portions of the upper segments are not much to look at. Deep red seed capsules that turn purple as they ripen sometimes develop in milder climates after the flowers are gone, but are almost never seen locally. Good exposure is preferred. Candelabra tree are better structured and more prominent standing alone away from other larger trees and shrubs. Cool winters and occasional frosts limit their height to not much more than fifteen feet; and unusually cold frost can actually kill big specimens back severely. However, in sheltered areas and milder climates, candelabra tree can get twice as tall. Soil should drain very well and get dry between watering. Regular watering can cause rot, particularly in dense or rich soil. The main problem with candelabra tree is the remarkably caustic latex sap, which can be dangerous to children, chewing dogs or even those who need to prune the stems. Fortunately, candelabra tree needs very little attention, and only needs to be pruned where the stems get in the way or start to lean against fences or roofs. The caustic sap prevents insect problems.
(This article is several years old, so contains outdated information.)
The sixteen acres of gardens of Filoli are spectacular and horticulturally compelling throughout the year. However, the weather through winter, although more pleasant than other places in the world, is not always quite so compelling or conducive to garden tours. At Filoli though, this is not a problem. More than six hundred volunteers and the Filoli staff merely bring the outdoors indoors, by selecting materials from the garden to adorn the interior of the 36,000 square foot Filoli residence for ‘The Wise Old Owl’, the annual fund raising Holiday Traditions Boutique.
While perusing The Wise Old Owl merchandise, guests can enjoy how so much more than flowers can be brought in from the garden to deck out the home. Bare stems, gnarly limbs, evergreen foliage, pine cones, bark and all sorts of bits and pieces of the autumn and winter garden demonstrate the potential for alternatives to traditional cut flowers that we may not even recognize as useful materials in our own gardens. Of course, there will be no shortage of the less abundant flowers that bloom through the season and decoration that are not out of the garden, as well as live music to enhance the display. Regardless of horticultural interest or boutique merchandise, the grand residence at Filoli is worth visiting even on the least eventful day of the year.
There are too many events within the Event to describe here. Guests can visit http://www.filoli.org to plan ahead and make reservations for buffet lunches and evening bistro dining, as well as an elegant Saturday Evening Dinner Party with dancing in the Ballroom. Children six to twelve years of age can enjoy a Children’s Tea on the finale of The Wise Old Owl on December 3.
The Wise Old Owl begins in only a few days on November 25, and continues through December 3. The hours of operation and admission are variable relative to the various events throughout the main Event. Reservations for specific events can be arranged and more information can be found online
Tickets can be purchased online, by fax or by telephoning Filoli weekdays between 9:00 a.m. and 4:00 p.m. At 650 – 364 8300 X 508. Order forms for fax transactions can be downloaded from the website and sent to 650 – 503 2090. Admission is limited; and tickets get exhausted somewhat early. Tickets are neither refundable nor exchangeable. Filoli is located at 86 Canada Road in Woodside (94062).
Tony Tomeo 