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Flowering Dogwood

Bloom like this waits for spring.

Flowering dogwood, Cornus florida has something in common with Poinsettia. The most colorful component of their bloom is not floral, but is instead foliar. What appears to be petals are colorful leaves known as bracts. Exactly four bracts surround each small cluster of tiny and unimpressive pale green real flowers. These bracts are most popularly white, but can be pink or rarely brick red.

The deciduous trees are bare now, but bloom spectacularly in early spring. Any necessary pruning should happen after bloom, and preferable after new foliage matures somewhat. Floral buds for next year are already prominent on the tips of bare twigs. Dormant pruning would eliminate some of the buds prior to bloom. For now, only minor grooming of unbudded interior growth is practical.

Mature flowering dogwood trees can be twenty feet tall, but typically stay lower. As understory trees, they prefer a bit of shelter from larger trees. Foliage can scorch if too exposed. Some cultivars have variegated foliage. All can develop vibrant orange and red foliar color for autumn, even with minimal chill. Floral debris resembles fallen leaves that fall just as new and real foliage develops.

Posted on by tonytomeo · 2 Comments

Winter Is Time For Pruning

Pomegranate trees appreciate major specialized pruning.

Plants are unable to migrate to warmer climates for winter like so many migratory birds do. They are immobile for their entire lives. Only potted plants can move to more sheltered situations when the weather gets too cool for them. Some get to live inside as houseplants. Otherwise, they all must contend with seasonally changing weather. Most are impressively efficient with how they do so.

Most that do not adapt efficiently to cool winter weather are tropical species. Tropicals that are native to high elevations can tolerate cold weather. However, many of the familiar tropical species are from low elevations where they never experience cold weather. Frost damages or kills them. Warm season annuals do not tolerate cool weather either. They just die at the end of their season.

Otherwise, almost all other plants go dormant through winter, at least to some degree. Even evergreen plants, which may not seem to go dormant, grow much slower during winter, or do not grow at all. Deciduous plants are much more obvious about their dormancy, because they defoliate. While bare, they are less susceptible to damage from wintry weather. Dormancy is like hibernation.

This is why winter is the best time for pruning most plants. While dormant, they are less susceptible to distress associated with pruning. Some plants expect some degree of damage from wintery weather during their dormancy anyway. They wake in spring, with no idea of what happened while they slept, and resume normal growth. Winter pruning conforms quite naturally to their life cycles.

There are, of course, a few exceptions. Citrus and avocado should not be pruned during winter. Such pruning stimulates new growth, which is sensitive to frost. Maple and birch should have been pruned earlier. They bleed annoyingly if pruned late into winter. Flowering trees that produce no fruit, such as flowering dogwood and flowering cherry, should be pruned after bloom, late in spring.

Deciduous fruiting trees, such as apricot, cherry, plum, peach, apple and pear, require specialized pruning during winter.

Posted on by tonytomeo

Santa Ana Winds

Santa Ana Winds are confined to Southern California. Although this region sometimes experiences similar offshore winds, such winds are neither as warm nor as arid as those that come from the Mojave Desert. This article is three years old, so the fires mentioned are old news.

tonytomeo's avatarTony Tomeo

P71221+They have been a part of life in Southern California longer than anyone can remember. The Santa Ana Winds have been blowing down from the high deserts to coastal plains long before people arrived in the region. They are arid and usually warm before they leave the Great Basin and Mojave Desert, and they get even warmer as the flow downhill through mountain passes. That is what makes them so dangerous during fire season. Wind alone accelerates wildfire. Warming arid wind desiccates fuel, making it more combustible before wildfire arrives.

Santa Ana Winds are so regular that they affect how tall trees grow within the regions of the mountain passes where Santa Ana Winds move the fastest. Tall Mexican fan palms that grew up straight where sheltered from wind near the ground innately lean with the prevailing wind as they grow up and become more exposed. Those closer to the…

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Dead Box Elder Update

After three years, this remains as undiagnosed as the mysterious death of the mistletoe that was described two weeks ago.

tonytomeo's avatarTony Tomeo

P71223P71223+What is killing the box elders? (https://tonytomeo.wordpress.com/2017/10/04/what-is-killing-the-box-elders/) I still do not know. I know that does not sound like much of an update. All I can share is some pictures of secondary symptoms observed now that the affected trees are deteriorating.

The two pictures above, although not relevant to any symptoms, are important to our Community because the historic Felton Covered Bridge just got a new roof! (https://tonytomeo.wordpress.com/2017/12/02/felton-covered-bridge/) Dead box elders that are already starting to destabilize and collapse are now leaning onto the edge of the new shingles! They really need to be removed before winter storms move them around, and they dislodge any shingles.

The first of the two pictures below show basidiocarps associated with fungal decay of the trunks and roots. This decay destabilized and compromised the structural integrity of the necrotic trees with remarkably efficiency. The trees died only last spring, and…

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Six on Saturday: Flowery Bits II

Rhody did not make the cut this week. There are too many minor flowers blooming. Only six can be shared here. Besides, flowers are more cooperative with getting their pictures taken than Rhody is. I should get six more flower pictures for next week as well, since I am trying to avoid the sort of dreary pictures I had been sharing, and the weather has not yet gotten interesting.

The botanical names of some of these flowers have changed over the years. The names I use may be outdated or updated. I can not be sure anymore. I am not certain about the identity of the hebe.

1. Hebe buxifolia, perhaps ‘Patty’s Purple’ hebe, is now beginning to succumb to cool winter weather. I am not certain if it has a definite bloom season. It seems to bloom randomly until frost.

2. Lobularia maritima, alyssum, is a warm season annual that finishes in winter, but replaces itself with seedlings that perform as cool season annuals for winter until warmer spring weather.

3. Diosma pulchrum, pink breath of Heaven, also seems to bloom whenever it wants to, although not quite as colorfully as hebe. This cultivar has lime green foliage instead of yellowish green.

4. Morea bicolor, butterfly iris, could be dug, divided, and shared with other landscapes. However, we can not adequately maintain the mature colonies that are already out in the landscapes.

5. Salvia greggii, autumn sage, is not just for autumn. Like the others, it blooms whenever it wants to. I like this one because it is only red. The flowers are too small to be both red and white.

6. Senecio X hybrida, cineraria, is leftover from when a few bedding plants were still added seasonally to a few prominent parts of the landscape. This one happens to be potted on a pedestal.

This is the link for Six on Saturday, for anyone else who would like to participate:

https://thepropagatorblog.wordpress.com/2017/09/18/six-on-saturday-a-participant-guide/

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Leopard Plant

Leopard plant looks like it would be at home in the garden of Kermit the Frog.

The differences between false ligularia (Farfugium spp.) and real ligularia (Ligularia spp.) are so vague that the the names are commonly interchangeable. Leopard plant happens to be a real Ligularia japonica. The round and very glossy leaves are dark green with random spots of sunny yellow. Mature plants form rather dense foliar mounds about a foot wide and nearly as high. Prominent floral trusses that bloom in late summer or early autumn are a pleasant surprise, even though the small and sometimes feeble daisy flowers are typically only dingy gold, and often have brownish centers. Both ligularia and false ligularia are understory plants that naturally prefer the shelter of larger plants, so they prefer partial shade. They also like relatively rich soil and regular watering, although once established, they can recover efficiently if they happen to briefly get dry enough to wilt.

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Winter Is For Getting Bare

Bare root plants do not look like much . . . yet.

Even before the last of the Christmas trees vacate nurseries, bare root nursery stock begins to move in, and will be available through winter. As the name implies, ‘bare root’ stock has bare roots, without media (‘potting soil’) or cans (pots) to contain the roots. Many are temporarily heeled into damp sand from which they get dug and wrapped in newspaper when purchased. Others are packaged in damp wood shavings or coarse sawdust contained in narrow plastic bags.

Bare root plants do not mind the lack of media because they get dug, shipped, sold and finally planted into their permanent locations all while naturally dormant through winter. They were in the ground when they went dormant, and will be back in the ground in their new homes by the time they wake up in spring. Because they have not already developed a densely meshed root system within a limited volume of media, they happily disperse new roots directly into the soil where they get planted.

Because they lack relatively bulky cans, bare root plants need less space in nurseries. Many more varieties of deciduous fruit trees, grapevines, roses and berries can therefore be made available. They also cost about half as much as common canned nursery stock.

If bare root plants will not be planted immediately, their roots should be heeled into damp dense mulch (not coarse chips) or soil, and watered. They can be soaked in buckets of water if planting will be delayed only for a day or two. Packaged plants need not be heeled in, and can wait in the shade for more than a week.

Planting holes do not need to be any wider or deeper than the roots. If the soil is loosened too deeply, in will likely settle and cause the new plants to sink. Graft unions must stay above the surface of the soil. (Graft unions are evident where rose plants branch, or as kinks low on tree trunks.) If backfill soil is amended at all, it should be amended only minimally. Otherwise, roots may not want to disperse very far. New plants should be soaked twice in order to settle soil around the roots, but if it rains soon enough, they may not need to be watered again until they start to grow in spring.

Once planted, most bare root plants need some sort of pruning. Fruit trees typically have more stems than they need to maximize the options for their first structure pruning.

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Very Bad Houseplants

Compliance with the ‘Horridculture’ meme for Wednesday is a bit of s stretch with this old article. At least it amusing.

tonytomeo's avatarTony Tomeo

P71230Just because it ‘can’ be grown as a houseplant does not meant that it ‘should’ be. That is a lesson that Brent and I never learned in college. He and I were roommates in the dorms at Cal Poly in San Luis Obispo, which, as you can imagine, was a problem. Our room on the top floor of Fremont Hall was known as the Jungle Room. It was so stuffed full of weird houseplants, as well as a few plants that had no business inside. We had a blue gum eucalyptus bent up against the ceiling, an espaliered Southern magnolia, a Monterey cypress, and a herd of camellias that we rescued from a compost pile on campus.

After college, our own homes were no better. Because my dining room was rather small, Brent gave me tall weeping figs that had unobtrusively bare trunks down low, and plenty of fluffy foliage…

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Canary Island Pine

Canary Island pine displays fluffy foliage.

For spacious landscapes, Canary Island pine, Pinus canariensis, became more common than Monterey pine through the 1970s. New trees became less popular as old trees demonstrated how big they get! However, as seemingly docile live Christmas trees, they still often sneak into gardens that are not big enough for them. Their short blue juvenile needles suggest that they stay small.

They instead get quite tall. Old trees can get more than a hundred feet tall, even if their canopy gets no wider than twenty feet. Their rich brown bark is distinctively and coarsely textured. Their thin and long needles are somewhat pendulous, with a rather fluffy appearance. They are in bundles of three. Although individual trees are not very broad, their shade can get too dark for other plants.

Canary Island pine is a stately tree, but is not easy to accommodate. It produces copious foliar debris that can shade out lawn and ground cover, and accumulate on shrubbery. In unrefined areas, without other plants, foliar debris suppresses weeds. However, too much can be combustible. Such grand and resilient trees suit parks, and are ideal for freeway embankments and interchanges.

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Christmas Trees Are Major Cut Foliage

Few Christmas trees are naturally compact.

Cut foliage is a common ingredient of ready-made mixed bouquets. Bundles and individual stems of cut foliage are available with cut flowers from florists. Cut foliage is the primary component of most wreaths and garlands that are now so popular for Christmas décor. It is another horticultural commodity like cut flowers, bulbs or nursery stock. Cut foliage is like vegetables that no one eats.

Cut Christmas trees are extreme cut foliage. They just happen to be much larger than stems of cut foliage that become wreathes and garlands. They grow on plantations like other crops. Contrary to a rather popular belief, Christmas trees are a renewable resource. Furthermore, cut Christmas tree production is less detrimental to the environment than the production of live Christmas trees.

Time and space are the only advantages of live Christmas tree production. As they grow, they occupy less space for less time. Obviously, cut Christmas trees need more space and time to grow. However, they do not consume proportionate quantities of water and fertilizers. Nor do they necessitate the consumption of the various plastics and synthetic potting media that potted trees need.

Regardless of the best intentions, few live Christmas trees come home for Christmas after their first. They often get too shabby through warm and dry summer weather to bring back in. The small and inexpensive sort with attached decorations rarely survive potted for more than a few months. If live Christmas trees were less perishable, their consumptive production could be more justified.

Whether they retire after a single Christmas or several, live Christmas trees must recover from previous shearing. Only dwarf Alberta spruce are naturally densely conical. Pruning other species to strict conical form is unnatural and disfiguring. As they recover, live Christmas trees need space to grow. Many, such as Italian stone pine and Canary Island pine, get far too big for urban gardens.

Experienced arborists concur that many problematic trees were originally small and seemingly innocent live Christmas trees.