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Aromatic Foliage Has Certain Advantages

Some plants are perhaps too aromatic.

Culinary herbs are mostly aromatic foliage. Their respective flavors are generally similar to their distinct aromas. Parsley, sage, rosemary and thyme are a few popular examples. So are basil, cilantro, chive, mint, oregano, dill, lavender and bay leaf. Ironically though, herbal flavors and aromas repel some insects or grazing animals. Such is their purpose.

The aromatic foliage of rosemary, for example, is a popular culinary herb. However, such foliage is aromatic primarily to repel grazing animals. So, it is both repulsive to deer, and coincidentally appealing for culinary application. Its endeavor to be unpopular has made it popular. For organisms that lack olfactory perceptions, plants make productive use of it.

Rosemary, though, is also popular because it is useful for landscape application. Some trailing cultivars grow as ground cover. Others are shrubby. Various species and cultivars of lavender are similarly useful for landscape situations. Bronze fennel became popular more for its visual appeal than its aromatic foliage. Many herbs can perform double duty.

Also, several plants that are not herbs have exceptionally aromatic foliage. Both trailing and shrubby lantana are almost obnoxiously aromatic. Society garlic, breath of Heaven, rockrose and some salvias can be also. While aromatic foliage should be appealing, it is sometimes objectionable to some. Warmth and humidity typically enhance foliar aroma.

Some aromatic foliage only exudes its aroma when disturbed. Junipers can be aromatic during their pruning, but may not be otherwise. Incense cedar, camphor and the various eucalypti and conifers are very aromatic. However, their foliage is very often out of reach. Native bay trees are very big, but culinary Grecian bay is proportionate to home gardens.

Because of aromatic foliage, window boxes became popular in ancient European towns. They were convenient planter boxes for growing herbs where garden space was scarce. Also, they sustained aromatic foliage that repelled mosquitoes prior to window screens. Trailing rosemary, nasturtium and ivy geranium are still very traditional accompaniments.

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Six on Saturday: Exotic & Native

The first three were recently added. The second three were already here. That makes for Six on Saturday.

1. Opuntia, prickly pear, of an unidentified species, was collected from the wild near the original Bat Cave, which is really the Bronson Caves, in Los Angeles. It is overly prickly.

2. Echinocereus, hedgehog cactus, also of an unidentified species, was collected from the wild in Buckeye, near Phoenix, in Arizona. It is even more prickly than the prickly pear.

3. Agave filifera, thread agave was salvaged from a planter box outside a barber shop in downtown Felton. The planter box needed to be dismantled, so the agave came with me.

4. Salvia, sage, also of an unidentified species, is part of a pattern of unidentified species here this week. It is native, though, so was here prior to the arrival of the previous three.

5. Whatever this is, it is also unidentified and native. The flowers resemble onion flowers in blue. I think that it might be Triteleia laxa, Ithuriel’s spear, but I really have no idea.

6. Achillea millefolium, common yarrow is native here, but may be descendents of some that were seeded here nearly twenty years ago. I do not remember any prior to seeding.

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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Mexican Fan Palm

Mexican fan palms are quite tall.

Queen palm might now be the most popular and common palm here. However, Mexican fan palm, Washingtonia robusta, is still the most prominent. That is because it is so very tall! It grows quickly to about fifty feet tall. Growth decelerates with maturity; but old trees are about twice as tall. Some of the tallest local specimens are more than a century old.

Mexican fan palms are about twice as tall as California fan palms, but slimmer. Their tall trunks lean as prevailing winds blow them. Consequently, some of the tallest lean above adjacent gardens rather than their own. The pleated and palmate leaves are about three feet broad. They are about six feet long with their petioles, which have unpleasant teeth.

Mexican fan palm is not discriminating about soil or water. It commonly self sows where it gets no irrigation, and grows well without it. With irrigation, it only grows faster. Without pruning, Mexican fan palm accumulates beards of dry fronds. With pruning, it can either retain a lattice of petiole bases on its trunk, or be shaven. Only arborists can prune them properly.

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Utilities Limit Appropriate Tree Selection

Clearance pruning can disfigure big trees.

Trees and utilities should not mix. Unfortunately, on rare occasion, they do. Trees cause electrical outages or fires by dropping limbs onto electrical cables. Telecommunications are also susceptible to such disruption. Arborists maintain clearance for utility cables, but can not eliminate all hazards. Several trees are simply too large and too close to utilities.

Of course, this is more of a problem within rural areas, where native trees grow wild. It is also sometimes a problem within urban areas, though. Many urban trees are too large for their particular situations. Some extend their growth within easements for aerial utilities. Selection of trees that are proportionate to their situations helps to avoid such problems.

Any palm tree that can grow tall enough to reach utility cables should avoid them. Palms grow only upward, so are not conducive to pruning around such cables. Any that get too close to high voltage cables will be subject to decapitation. That entails removal of their solitary terminal buds, which kills them. Then, their dead carcasses necessitate removal.

This is unfortunately a common problem. Mexican fan palms commonly grow below high voltage cables. This is because birds that drop their seed so often perch on such cables. Also, queen palms are popular for planting within rear corners of backyards. This is often directly below aerial utilities. Queen palms reach such utilities within only several years.

Palm trees are not the only concern in regard to utilities. Various sycamores, ashes and elms vigorously grow quite tall. Canary Island pine and sweetgum develop upright form. Actually, any tree that grows as high as high voltage cables should avoid them. Plenty of smaller trees are available. Clearance pruning for aerial utilities is potentially disfiguring.

Pruning any tree near high voltage cables is extremely hazardous. This is why electrical service providers employ professionally trained arborists to do so. Unfortunately though, proper arboricultural technique is not a priority. Safety and reliability of electrical service are. Pruning for clearance of utilities is efficient, but can severely damage subject trees.

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Six on Saturday: More Memories

Nearly everything in my garden has history of some sort.

1. Aloe arborescens, candelabra aloe came from the home of a friend in the East Hills of San Jose about twenty years ago. It is the only one of these six that was not just planted.

2. Aloe barbadensis, aloe vera came from my former neighborhood in town. I relocated decades ago, but got pups from a former neighbor who also took some to her new home.

3. Hesperaloe parviflora, red yucca came from Surprise, to the northwest of Phoenix in Arizona, near the new home of my former neighbor who gave me the few aloe vera pups.

4. Yucca desmetiana ‘Blue Boy’ yucca was a Christmas gift several years ago. It had been confined to its can within partial shade for too long. It already has stout but bare trunks.

5. Yucca glauca, soapweed grew from seed that I collected at a gas station somewhere in New Mexico on the way to Oklahoma in late 2012. It must be happy to be in the ground.

6. Yucca arkansana, Arkansas yucca, contrary to its name, came from Newalla, just east of Oklahoma City in Oklahoma, not long after I acquired the soapweed seed in late 2012.

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/

Posted on by tonytomeo

English Ivy

English Ivy often climbs into trees.

With containment, English ivy, Hedera helix, is a dense and evergreen groundcover. As it matures, it eventually excludes weeds. Containment is very important, though. It grows fast into trees and shrubbery, and clings to buildings. On buildings, it promotes decay of wood siding and ruins paint. As a vine, it is safe only on concrete and cinder block walls.

Juvenile growth of English ivy is mostly rather compact. Ideally, it is less than six inches deep. It gets a bit deeper where shaded. Leaves are as wide as three and a half inches. Stems develop roots where they touch the soil. Adult growth is shrubby, though, and can protrude several feet higher than its support. It blooms and produces small black berries.

‘Hahn’s’ is probably the most popular cultivar of English ivy because it branches so well. ‘Needlepoint’ has elegantly narrow foliar lobes. Cultivars with yellow or white variegation grow notably slower. They are popular as foliar components in big pots of mixed annuals and perennials. Some of the hundreds of cultivars are more popular as houseplants than outside.

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Vines Are Naturally Very Competitive

Some vines climb with clinging roots.

Nature is competitive. Competition is natural. In the wild, vegetation competes for limited resources. Where sunlight is a limited resource within forest ecosystems, competition for it is fierce. Understory vegetation does what it can in the shade of taller trees. Taller trees strive to be the tallest for more sunlight. Vines are the most aggressive competitors of all.

Vines are blatantly exploitative. They rely on trees to do the work of growing to the top of the forest canopy. Then, they climb into and over such trees to grow even higher than the trees do. Some can overwhelm and even shade out and kill the trees that they rely on for support. Strangler fig literally strangles its hosts as it develops its own supportive trunks.

Vines climb with clinging roots, twining stems, tendrils, twining leaves or hooked thorns. Some are perennials or even annuals. Some sprawl over the ground while juvenile, and then climb as they encounter support. As they reach the top of their supports, such vines generate shrubbier adult growth. Then, such adult growth can bloom and generate seed.

English ivy, for example, is a practical groundcover plant in its juvenile form. However, it becomes a clinging vine when it finds support. It quite often climbs shrubbery, trees and buildings. If left unattended, it develops into shrubbier growth that blooms and produces seed. Such shrubby growth shades desirable vegetation, and on buildings, promotes rot.

Carolina jessamine, lilac vine, mandevilla and wisteria climb by twining stems. They are generally not as potentially destructive as clinging vines. However, they can crush lattice or small trellises. Wisteria can crush substantial trellises. Like English ivy, star jasmine is likely more popular as a ground cover. It performs double duty, though, as a twining vine.

Bougainvillea neither clings nor twines. It merely produces vigorously tall canes that flop over on top of their support. Long thorns help to anchor them into place. Therefore, such canes need a bit of help to climb trellises or other support. They must be tied in place or woven into their trellises. Various other vines exhibit various and distinct characteristics.