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Lemon Bottlebrush

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Hummingbirds enjoy red lemon bottlebrush bloom.

As its compact cultivars gained popularity over the years, the formerly common lemon bottlebrush, Callistemon citrinus, became passe. Most are mature specimens in old fashioned landscapes. It is unfortunate. Only lemon bottlebrush and weeping bottlebrush can grow as small trees. (However, lemon bottlebrush is now classified as Melaleuca citrina. Most Melaleuca get notably larger.)

If competing for sunlight, mature specimens of lemon bottlebrush can almost reach upstairs eaves. Well exposed specimens may not get much more than half as tall, with mounding form of about equal width. Removal of low growth to expose sculptural trunks and handsomely shaggy bark promotes higher growth above. Shearing of hedges should not be too frequent to allow some bloom.

Bright red bloom is sporadic through the year, and gets more abundant as summer becomes autumn. The small and staminate flowers are densely set in cylindrical ‘bottlebrush’ formation. These blooms are about two or three inches long, almost as wide, and popular with hummingbirds. Dense evergreen foliage is aromatic. Individual leaves are narrow and about two or three inches long.

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Carob

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John the Baptist really knows carob.

The locusts that John the Baptist ate out in the desert were not grasshoppers. They were the nutritious locust pods of the carob tree, Ceratonia siliqua. Their familiar sweet cocoa flavor was probably fine for a while, but the starchy texture must have gotten dreadfully monotonous. After all these centuries, carob is still grown for food and as a shade tree.

It takes a very long time for a carob tree to get taller than forty feet. Most are less than thirty feet tall, and not quite as broad. Their rounded canopies are very dense. The stout trunk and limbs are quite sculptural, with variably but handsomely textured bark. The five or six inch long evergreen leaves are pinnately compound, with very glossy round leaflets.

Unfortunately, the big chocolaty pods are abundant enough to be messy if not harvested. Trees that do not produce pods bloom in autumn with seriously stinky male flowers that attract flies for pollination. Some trees are both male and female, so are both messy and stinky. Because carob trees are grown from seed, their gender can not be predicted.

Since they are from the drier regions around the Mediterranean Sea, carob trees really do not crave for much water once they have dispersed their roots. They grow somewhat faster if watered generously a few times through summer, but will survive without it. Too much water will cause buttressed roots that will break nearby concrete.

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Bird Nest Cypress

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Bird nests should be so refined.

Port Orford cedar is a grand tree. It is native to the southern coast of Oregon and the very northwestern corner of California. Mature trees in the wild are more than a hundred fifty feet tall. Some of the older big trees within landscapes are more than forty feet tall. However, the cultivar known as bird nest cypress, Chamaecyparis lawsoniana ‘Nidiformis’ is remarkably diminutive and shrubby.

Bird nest cypress grows slowly, and may never get more than five feet high and wide. Individual plants are mounding with rather flat tops. A row of plants eventually becomes a low informal hedge. Distinctively flat sprays of slightly grayish evergreen foliage exhibit a soft feathery texture. Unless pruned otherwise, abundant dense foliage obscures main limbs with fissured reddish brown bark.

Most cultivars of Port Orford Cedar, including bird nest cypress, are uncommon here. They actually prefer cooler and moister climates. Locally, they are sensitive to harsh exposure and wind while the weather is warm. A bit of partial shade is no problem. Established plants do not need much water, but should not get too dry for too long. Selective pruning, not shearing, sustains natural form.

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Coffeeberry

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Coffeeberry must be and ‘acquired’ taste. (Ick!)

Before the 49ers of the Gold Rush discovered that the seeds of the native coffeeberry, Rhamnus californica (or Frangula californica), make a nice uncaffeinated coffee substitute, the native American Indians were eating the fruit and using the leaves and bark herbally. The black berries supposedly make good jelly, but do not last long, and are too bitter while still red or greenish.

Before the birds get them, the quarter inch wide berries are somewhat colorful, but are not very abundant. The small clusters of tiny greenish yellow flower that bloom in spring are not much to look at either. The army green evergreen foliage is the main appeal. New stems are somewhat ruddy. Old stems and main trunks have smooth gray bark.

Large coffeeberry plants in the wild can get more than ten feet tall, with relatively open branch structure. Garden varieties stay smaller, with compact branch structure. ‘Eve Case’, which is probably the most popular variety, stays less than six feet tall, and is densely foliated. ‘Mound San Bruno’ is even more compact, with smaller leaves. ‘Seaview’ is a groundcover.

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Cucumber

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Cucumber can ripen in summer too.

Is it a winter vegetable or a summer vegetable? Technically, like many vegetables, cucumber, Cucumis sativus, is actually a fruit. It dislikes the locally arid warmth of summer, but also is intolerant of winter frost. It performs best through spring and autumn. Seedlings grown as winter ends should be ready for transplant after the last frost. Vines grown now produce a bit more before first frost.

However, in some gardens, some varieties of cucumber can remain productive all summer. Discolored older foliage is more unsightly than detrimental. Newer growth cascading from above might obscure some of it. Vines can climb trellises or over shrubbery. If vines sprawl over soil, the fruit will stay cleaner if set on leaves or newspaper. Regular harvesting promotes continued production.

Most cucumbers are classified as slicing, pickling or seedless cucumbers. There are many varieties within each classification. The most popular are only a few inches long, and harvested before maturity. The largest cucumbers are as long as two feet, and as wide as four inches! Hot weather unfortunately causes cucumbers to be bitter. Rich soil and regular irrigation promote better flavor.

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Sea Foam Statice

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Statice flowers last fresh or dried.

Many of us who already grow sea lavender, Limonium perezii, might wonder why it is a topic for August. In the mildest spots, it gets more credit for blooming in winter while most other plants are dormant. Yet, it is actually classified as a summer blooming perennial because it blooms more reliably though summer in most places.

Bluish purple blooms stand more than two feet tall, just above coarse mounds of evergreen basal foliage that gets more than two feet wide. Each billowed bloom contains many tiny flowers. Larger blooms are too heavy to stand upright, so they lay down on the foliage. The weirdly wavy leaves are on such long petioles (leaf stalks) that they may lay down too.

Established plants do not need much attention or water. Faded bloom should be pruned away. It is not practical to remove all of the faded foliage. Every few years or so, old plants can be reinvigorated by getting divided. Newly divided rhizomes will need to be watered regularly until they disperse their roots. Sea foam statice likes full sun exposure.

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Angel’s Trumpet

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Powerful fragrance combines with docile color.

Human intervention has sustained the seven species of angel’s trumpet, Brugmansia, since their prehistoric extinction from the wild. They were likely endemic to tropical regions from Venezuela to Chile, and southeastern Brazil. Their extinction was likely a consequence of the natural extinction of animals that dispersed their seed. Most garden varieties are hybrids of the various species.

Angel’s trumpet is either a big shrub or small tree, with rather herbaceous stems. The more popular cultivars can get more than eight feet tall. Cultivars that might get twice as tall are rare. The soft leaves get about six inches long and half as wide. Leaves might get almost twice as long on vigorous growth. Some cultivars have slightly tomentous (fuzzy) foliage. A few have variegated foliage.

Although generally sporadic, and pastel hues of pink, orange, yellow or white, bloom is impressive. The pendulous trumpet shaped flowers are commonly longer than six inches, and half as wide. Double flowers are frilly. Several cultivars are delightfully fragrant, particularly in the evening. All plant parts are very toxic. Plants damaged by frost in winter are likely to regenerate from their roots.

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Plumbago

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Few blooms are this blue.

There are not many flowers as blue as those of plumbago, Ceratostigma plumbaginoides. Individual flowers are not much more than half an inch long, but can be quite abundant until autumn. Each of the many terminal flower clusters is on a rather reliable schedule, so that new flowers begin to open as older flowers begin to fade.

Thin stems stand only about half a foot to a foot above underground rhizomes. Individual plants get about 3-feet wide, but realistically, will slowly spread farther if conditions are right. They do not spread fast enough to be invasive, but can get into some unexpected spots if not controlled. The simple leaves are about two inches long.

The main problem with plumbago is that it is deciduous, so it dies back to the ground in autumn. The weather is too mild here to produce the good fall color seen where autumns are cooler. Plumbago is a popular bulb cover because new growth, although slow to develop, emerges just in time to obscure fading foliage of early spring bulbs like daffodil and tulip.

Plumbago also works well with stone, since the stone is still appealing without the foliage through winter. The wiry stems weave nicely through otherwise bare cobbles, or spill slightly over low stone walls. Even though shade inhibits bloom, plumbago makes a nice informal ground cover under open shrubbery.

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Camphor Tree

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Camphor trees have stout branch structure.

The best camphor trees, Cinnamomum camphora, are in parks and other spacious landscapes. Such trees have sufficient room for their broad canopies. Although they do not grow rapidly, they eventually get quite large, and perhaps too massive for confined urban gardens. Some of the older local trees are nearly fifty feet tall, and nearly as broad. They have potential to get much bigger.

Camphor trees excel as shade trees. Their light green or perhaps yellowish evergreen foliage is quite dense. Shade of groups of trees or large trees with low canopies inhibits the growth of lawn grass. Also, roots are likely to eventually elevate lawn or other features that are close to the trunks. Foliar canopies are billowy, but can be lopsided, especially in windy or partly shaded situations.

Trunks and main limbs of camphor trees are rather stout, and can be rather sculptural. Trees should be pruned for clearance while young. Otherwise, obtrusively low limbs can become prominent components of the canopies. The tan bark is distinctively checkered. It darkens handsomely with rain. All parts of camphor tree are quite aromatic. Frass from spring bloom can be slightly messy.

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Himalayan Birch

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The white bark of Himalayan birch is even more striking that that of European white birch.

Himalayan birch, Betula utilis ‘Jacquemontii’, must not be confused with the more traditional European white birch! If young trees get added to established groves of European white birch, they will never fit in. Their trunks stand vertically rather than lean casually. Their limbs are upright and angular instead of softly pendulous. Their bark is actually whiter.

Mature trees can get taller than thirty feet without getting much more than half as broad, and are relatively symmetrical for birches. The form of any single exposed tree is generally conical, although several trees together adapt to develop as picturesque groves with fewer interior limbs. The shade below is not too dark for lawn or moderately shade tolerant plants.

Maintenance is not exactly minimal. Vigorous young trees should be pruned and groomed annually, or at least every few years. Pruning should not be done in early spring when sap is likely to bleed from pruning wounds. Roots want to be watered somewhat regularly, even through the drought. When they fall in autumn, the two inch long leaves can be difficult to rake from fine gravel or bark.