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Coast Live Oak

Coast live oak grows quite large.

Coast live oak, Quercus agrifolia, is more adaptable in the wild than in home gardens. It can grow in groves or mix with other tree species, particularly at the coast. Alternatively, it can grow solitarily in open grassland, particularly inland. Solitary specimens can be a few centuries old. They can grow as tall and wide as seventy-five feet, with a few trunks.

Within irrigated home gardens, though, coast live oak likely does not survive for as long. It is impossible to know because no home garden here is a few centuries old. With water, young specimens mature faster than they would in the wild. Once established though, no irrigation is needed. Mature wild specimens often succumb to root rot with new irrigation.

Coast live oak is more appealing in the wild than within home gardens anyway. It sheds foliar debris continually, particularly as new foliage emerges during spring. Although it is technically evergreen, it replaces its foliage annually. Its foliar debris is mildly herbicidal to delicate plants below, and stains pavement. Every few years, acorns are very prolific. Seedlings can appear in the oddest of situations.

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Trees Should Fit Their Gardens

Some trees eventually grow very large.

A tree is a woody perennial plant with a single tall trunk and branches. However, several tree types can not conform with this overly simplistic definition. Palm trees and tree ferns are neither woody nor branched. Although branching, arboriform yuccas and dracaenas are no woodier than palms. Banana trees develop a few unbranched herbaceous trunks.

Actually, several types of trees do not conform with their own definition. Many Japanese maples, crape myrtles and olive trees develop multiple trunks. Many citrus are not as tall as big shrubbery. Papayas are merely large perennials that survive for only a few years. Banyans support their canopies with multiple aerial roots instead of conventional trunks.

Generally, though, trees are the most significant living components within their gardens. Not much else within home gardens is as big or as permanent as its trees are. Some old oaks inhabited their gardens centuries before their gardens. Some old redwoods contain more lumber than their associated homes. Many trees influence adjacent home gardens.

This is why proper selection is so important. Trees must be appropriate to their particular applications. They should remain proportionate to their particular situations, even if they live for centuries. They should not generate more mess than those living with them want to contend with. Also, they should not require more maintenance than they will likely get.

Shade trees near houses should be deciduous to allow sunshine through during winter. Evergreens at a distance can obscure unwanted scenery throughout the year. Evergreen vegetation is generally a bit messier than deciduous vegetation, though. It sheds through the year instead of only in autumn. Utility cables and easements limit placement of trees.

Many municipalities have adopted strict tree preservation ordinances. Such ordinances protect heritage trees or trees that exceed a particular size. They often make it difficult or impossible to remove unwanted and problematic trees. Preemptive selection of the most appropriate tree varieties helps avoid such situations. Prevention is better than the cure.

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Pygmy Date Palm

Pygmy date palm is quite diminutive.

Canary Island date palm is the grandest of palm trees locally. Pygmy date palm, Phoenix roebelenii, is of the same genus, but conversely diminutive. Only a few very old trees are more than ten feet tall. Its pinnately compound leaves are less than four feet long. Its thin leaflets are less than ten inches long. The evergreen foliage is billowy with a fine texture.

However, inner foliage is somewhat spiny. Like all date palms, pygmy date palm defends its single terminal buds. The spines are actually specialized proximal leaflets. Unlike all other date palms, mature pygmy date palms are not conducive to relocation. Fortunately, they are compact enough to remain in large pots indefinitely. Many have multiple trunks.

Pygmy date palm, with enough sunlight, is a splendid houseplant. It is also proportionate to compact atriums and enclosed patios. It is ideal for those who enjoy the aesthetics but not the scale of big palm trees. Visually, pygmy date palm resembles common date palm more than Canary Island date palm. It appreciates regular irrigation, particularly if potted.

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Palm Trees Within Home Gardens

Palm trees make a bold statement.

Trees conform to an overly vague definition. Most simply, they are substantial and woody perennial plants with tall trunks and branches. Yet, several Japanese maple trees are no more substantial than big shrubbery. Tree ferns and banana trees are neither woody nor branched. Arboriform yucca trees and palm trees are technically herbaceous, not woody.

Doum palms, which are the only palms that develop branches, are extremely rare locally. Any other palm which develops a branch is an extremely rare aberration. Therefore, with very few and extremely rare exceptions, palm trees develop no branches. A few, such as the Mediterranean fan palm, develop a few trunks though. All trunks develop at the base.

Palm trees are either fan palms or feather palms. Fan palms have round palmate leaves on sturdy petioles. Feather palms have elongated pinnately compound leaves on sturdy rachises. Most fan palms have nasty teeth on their petioles. Several feather palms have dangerously sharp spines on the bases of their rachises. All palms trees are evergreen.

Once palm trunks begin to grow upward, they do not widen. Nor do their foliar canopies. They grow only vertically. Those that encroach into high voltage cables require removal. Unfortunately, most palm trees grow high enough to necessitate the services of arborists. Although trunks do not expand, some large palms develop widely distended basal roots.

Mexican fan palms are the most prominent of palm trees locally because they are so tall. California fan palms, or desert fan palms, are shorter and stouter but much less common. Canary Island date palms are big and bold feather palms with wide and dense canopies. Common date palms, which only became common recently, are not as broad and dense.

Queen palms develop billowy and feathery canopies on tall and elegant trunks. They are among the most popular of palm trees nowadays. Windmill palms are relatively small fan palms with very shaggy trunks, but can grow tall. Mediterranean fan palms stay lower but with a few curving trunks. These are merely a few examples of many different palm trees. A few more are available. Bismarck palm and hesper palm are becoming more popular.

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Flowering Cherry

Flowering cherries bloom for early spring.

Flowering cherries are a complicated group of many distinct hybrids, of several species. Japanese cherry, Prunus serrulata, is the most common ancestor of almost all of them. It is a relatively small deciduous tree that does not get much more than twenty five feet tall. The wild species produces unpalatable fruit, but its many hybrids are generally fruitless.

Most flowering cherries exhibit splendid autumn foliar color, with yellow, orange and red. Weeping cultivars develop strikingly pendulous form. Birch bark cherry exhibits distinctly smooth and chestnut brown bark, with broad lenticels. Weeping cultivars are sometimes grafted onto birch bark cherry trunks. This combines pendulous form with smooth trunks.

The primary allure of flowering cherries, though, is their profusions of early spring bloom. Floral color ranges from bright white to rosy pink, although most cultivars are pastel pink. Flowers can be delicately single or billowy double. Some cultivars bloom slightly earlier or later than others, but all bloom quite early. Their blooming stems are pretty cut flowers.

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Flowering Trees For Spring Bloom

Flowering cherry trees are conveniently compact.

Fruit trees such as apricot, cherry, peach and plum, bloom about now. Some are already finished, while a few are just beginning. Apple and pear trees will bloom somewhat later. More colorfully, flowering or fruitless counterparts of such trees are on similar schedules. Flowering apricot has already finished bloom. Flowering crabapple will likely bloom last.

The difference between fruit trees and their flowering counterparts is not their bloom. It is their fruit or lack thereof. “Flowering” has become a euphemism for “fruitless”. Trees with such designation produce either no fruit or fruit of relatively inferior quality. Wildlife might enjoy some of any inferior fruit. Although, even inferior crabapples might make good jelly.

Purple leaf plums are probably the most popular of this type of flowering or fruitless tree. Flowering cherry is less common. Flowering peach is somewhat rare. Fruitless pear is a popular street tree, but may not bloom as profusely as the others. Also, it does not bloom quite as early. Flowering quince grows as shrubbery rather than trees with upright trunks.

While very closely related, fruiting trees and their fruitless counterparts are very different. Fruiting trees should obviously produce fruit. That is their primary purpose. Their fruitless counterparts are merely ornamental. The truly fruitless types grow and bloom where fruit would be a messy nuisance. For example, some perform well as small scale street trees.

Because they are fruitless, such trees do not require specialized dormant pruning. There is no need to prune to concentrate resources into developing fruit. Nor is there any need to prune to accommodate the weight of fruit. Fruitless trees can assume their natural form and scale instead. Although none are large trees, they can grow taller than fruiting trees.

Also because they are fruitless, their bloom is their priority. They bloom more abundantly than fruiting trees, and some bloom with double flowers. Floral color is more diverse too, ranging from bright white to rich rosy pink. Some flowering crabapple trees bloom nearly red. Since dormant pruning is unnecessary, blooming stems are splendid as cut flowers.

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Citrus Fruits Ripen Through Winter

Citrus fruits of winter include lemons.

Planting and pruning of deciduous fruit trees are priorities for winter. Evergreen fruit trees are not as much of a concern. For them, planting and pruning should happen after winter. However, most citrus trees are most productive with their summerish fruit through winter. Oranges, lemons, limes, Mandarin oranges, grapefruit and more are ripening about now.

With the exception of Mandarin oranges, most citrus fruits are impressively durable. Most can last for months on their trees, which is likely why they seem so summerish. Mandarin oranges have loose skin, which causes them to oxidize faster than the others. ‘Valencia’ oranges, though, can linger for a year after ripening. They actually sweeten as they age.

Also, some cultivars of citrus extend their production with sporadic fruiting. While ‘Lisbon’ lemon fruits only for winter, ‘Eureka’ lemon fruits more sporadically. ‘Eureka’ is actually a cultivar or cultivated variety of ‘Lisbon’. Although a bit less productive in season, ‘Eureka’ produces several fruits out of season. It rarely disappoints by failing to provide a few fruit.

Oranges and lemons are the most familiar of citrus. They are surprisingly diverse though. ‘Meyer’ lemon is almost as acidic as other lemons, but with a richer flavor like an orange. Most oranges are dessert oranges for eating out of hand, but ‘Valencia’ is for juice. Blood oranges are for juicing, but ‘Moro’ is a dessert orange. Sour oranges are for marmalades.

Mandarin oranges that developed in the Americas formerly classified as tangerines. Now they seem to qualify as Mandarin oranges, like more traditional Mandarin oranges. They collectively might be the most diverse class of popular citrus. More cultivars of Mandarin orange are available than the others. ‘Rangpur’ lime is actually a sour Mandarin orange.

There is so much variety among citrus. Besides oranges, lemons and Mandarin oranges, there are too many to list. Grapefruit, limes kumquats, pomelos, calamondins and citrons are a few examples. Limequats are hybrids of limes and kumquats. Tangelos are hybrids of grapefruit and Mandarin oranges. Orangequats are hybrids of oranges and kumquats.

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Live Christmas Trees Grow Up

Living Christmas trees eventually grow up.

Cut Christmas trees are the epitome of cut foliage. They grow on farms until harvest, like most other cut foliage. They then beautify homes and other interior spaces for Christmas. Ultimately, they become compost or green waste. Live Christmas trees are very different. They also grow on farms, and beautify interior spaces, but are living, evergreen conifers.

They are supposed to be the more sustainable option. Ideally, some live Christmas trees function as such for multiple years. A few are actually appropriate to home gardens when they grow too big to bring in. Realistically though, most live Christmas trees grow too fast and too large. Some actually become more of an environmental detriment than an asset.

Furthermore, live Christmas trees are actually less sustainable than cut Christmas trees. Cut Christmas trees grow on plantations where they need merely irrigation and fertilizer. Live Christmas trees require plastic pots, synthetic growing medium and more fertilizers. They only become sustainable after several years of reliable service as Christmas trees.

Among live Christmas trees, the more expensive sorts are typically the most sustainable. Various spruces grow slowly enough to remain potted and symmetrical for several years. They are more expensive because they take so long to grow to marketable size. As they outgrow their pots, most are proportionate to home gardens. Few grow as big shrubbery.

A few compact cultivars of fir and even pine are about as sustainable as spruces. Lemon cypress, Eastern red cedar and arborvitae are more conducive to shearing. Even as they grow faster, they can remain confined to pots for quite a few years. Afterwards, they might fit well into a garden. If not, they can be given to neighbors who can accommodate them.

Cheap, overly common and pre-decorated live Christmas trees are the least sustainable. Almost all are Italian stone pine or Canary Island pine. A few might be Aleppo pine. They may be pretty while new, but do not perform well for long as potted plants. However, they grow much too large for compact home gardens. Their long term options are very limited. Big trees require big landscapes.

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Mugo Pine

Mugo pine exhibits very compact growth.

Although it classifies as a tree, mugo pine, Pinus mugo, is more like shrubbery. Old trees may be only a few feet tall, and maybe twice as wide. Not many are more than eight feet tall. Their form is densely rounded. Foliage is deep forest green. Stiff paired needles are only about one to two inches long. Plump cones are not much longer, and are quite rare.

Mugo pine, although native to the Alps, is a traditional feature of Japanese gardens. Yet, it is rare within other types of gardens. It does not grow fast or big enough to be practical for much more than aesthetic appeal. It does excel at that, though, by developing such a distinctly rounded form. It can work well as foundation planting or a short informal hedge.

Mugo pine is not particularly discriminating about local soils or climates. It merely craves sunny and warm exposure. Mature specimens do not need much water, but are healthier with occasional irrigation. Mugo pine appreciates room for unrestricted growth. Shearing deprives it of its natural form and texture. If necessary, selective pruning may be tedious.

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Norfolk Island Pine

Norfolk Island pine seems to have been built rather than grown.

            In coastal areas of Southern California, the Norfolk Island pines, Araucaria heterophylla, are among the most distinctive large trees. Perhaps they are better described as ‘unusual’ . . . , or even ‘strange’. They are so symmetrical that they seem to have been assembled from prefabricated kits than to have grown as natural trees. Their strictly organized conical branch structures and remarkably straight central trunks are always visible through their uniformly open canopies. In such mild climates, they can get nearly a hundred feet tall and half as wide, so are not easy to hide. In Hawaii, their symmetry has actually made them popular as Christmas trees. Their finely textured juvenile foliage is comprised of narrow, half inch long pine-needle like leaves, which are wider among adult growth.

            Locally though, Norfolk Island pines are primarily enjoyed as houseplants, particularly since they can grow slowly and live in pots for many years. The climate is just a bit too cool in winter for them to be very happy in the garden. However, as they eventually get too large for their homes, many end up in the garden anyway. They stay much smaller and are not nearly as symmetrical as they are in milder climates, and may be damaged by the more severe frosts every few years, but they have a certain appeal and distinction regardless. Those that get planted in the garden while young seem to be more symmetrical than those that get disfigured by living as houseplants longer. For some reason, trees that develop weak or curved trunks as houseplants tend to continue to grow with interestingly irregular trunks and branch structure.