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Xeriscape Is Definitely Not Zeroscape

Ocotillo actually prefers more xeric climates.

“Zeroscape” is a neologism that evolved from “xeriscape”. It was a mispronunciation that became a misspelling that became a real word. Ironically, it makes sense. It evolved with the misconception that a xeriscape requires no maintenance. Now, the two are different types of landscapes. A Zeroscape is pavement or gravel that requires zero maintenance.

A xeriscape is a landscape of xeric vegetation. Generally, such a landscape needs less maintenance than conventional landscapes. Nonetheless, some degree of maintenance is necessary. Furthermore, several xeric species require very specialized maintenance. Such specialized requirements may be more demanding than more familiar gardening.

The primary advantage of a xeriscape is that it needs less water than other landscapes. Some xeric species are native to Mediterranean climates. More are native to arid desert climates. Once established, they need minimal irrigation. Many xeric species get all the moisture they need from seasonal rainfall. Some can not tolerate much more than that.

Native species that grow wild can be surprisingly difficult to establish in home gardens. Some xeric species can be even more uncooperative. Cultivation within a garden is very different from natural conditions. In the wild, such species disperse roots proportionately as they grow from seed. In a garden, they begin with detrimentally confined root systems.

Even xeric vegetation within a xeriscape needs moisture while it disperses roots. A few may get enough through winter if they get into a garden early in autumn. Most prefer a bit of irrigation at least through their first year. The difficulty is that some can rot if irrigation is even slightly excessive. They are more susceptible to rot than species that are not xeric.

Maintenance of a xeriscape, is more challenging than demanding. That is because so many xeric species are from harsh desert ecosystems. They innately defend themselves from grazing wildlife. Consequently, cacti, agaves and yuccas are wickedly thorny and spiny. Several are potentially dangerous to handle. So are some euphorbs and acacias. They may not need maintenance often, but when they do, they do not make it at all easy.

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Our Lord’s Candle

(Hespero)Yucca whipplei – our Lord’s candle

(Hespero)Yucca whipplei has an identity crisis. My contemporaries and I learned it as Yucca whipplei. Botanists now insist that it identifies as Hesperoyucca whipplei, although, like any and all other species of Yucca, it can hybridize with any and all other species of Yucca. (If it is a different species of the same genus, such hybrids would be interspecific hybrids. If it is a different genus, such hybrids would be intergeneric hybrids, which is even weirder.) Also, my contemporaries and I learned its common name as Spanish bayonet. Botanists prefer to designate it as chaparral yucca. It is alternately known as foothill yucca, Quixote yucca or our Lord’s candle. Because it was the only species of the genus that was locally native, we typically referred to it merely as yucca. Later, I learned that Spanish bayonet is a general designation for a few arboriform species of Yucca, which develop trunks and perhaps limbs, such as Yucca aloifolia, and that Spanish dagger is actually more commonly a generic designation for a few species that lack significant trunks or limbs, such as this particular species. Anyway, regardless of all this nonsense, I had been wanting to grow this species since encountering it while studying horticulture at California Polytechnic State University in San Luis Obispo, but could not find an appropriate situation in which to do so. It is too wickedly spiny for most landscapes. I was told that a specimen inhabited one of the landscapes at work, but because it did not look familiar, I was sceptical. It adapts so efficiently to whatever situation that it grows into, that its foliage here is somewhat different from how it develops in the wild around San Luis Obispo. Its impressively tall bloom is very familiar though, and is very distinctive of the species.

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Sculpture

Eucalyptus citriodora – lemon gum

Eucalyptus citriodora, lemon gum, is one of several species that I miss from the more southern portion of the Central Coast and Southern California. San Luis Obispo, where Brent and I studied horticulture at Cal Poly, and where I learned to appreciate this particular species, is technically within the same climate zone as Los Gatos. Nonetheless, many species that are popular in Southern California are more popular there than here, perhaps because of the proximity to Southern California. I got this picture on the inland edge of Highway 101 in Carpinteria on the return trip from Los Angeles. It demonstrates how sculptural the elegantly slender, smooth and pallid trunks and limbs of lemon gum are. The airy foliage is delightfully aromatic, but is too high to reach among trees that are sufficiently mature to be so sculptural. A few other eucalypti are similarly but distinctly sculptural. Some develop heftier trunks and limbs. Some develop blotched or uniformly coarse bark. Also, several other genera, such as coast live oak, camphor and ‘Marina’ madrone, develop sculptural form. Such form should be more of a consideration for modern landscape design, as it was until about the late 1970s, when trees like European white birch and the last of the complaisant eucalypti slowly became passe. It is actually gratifying to notice that a few daring horticulturists are experimenting with some of the smaller species of eucalypti that could have become popular years ago, as well as a few that had not yet been introduced. Where lemon gum might eventually grow too large, smaller species, such as Eucalyptus caesia, gungurru, might be more proportionate. Of the more than seven hundred species of Eucalyptus available, more than a few must be appropriate to refined home gardens, and more than a few of such are likely sculptural.

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Six on Saturday: Blooms With a View

Blooms With a View Spring Garden Tour of View Park and Ladera Heights happened to be on the day after I arrived late in Los Angeles. That is why I stayed another day late to help exhibit one of Brent’s three landscapes that were featured in the Tour. I did nothing more than answer a few questions, discuss random horticultural trivia, and share copies of a list of some of the other easily visible neighborhood landscapes that Brent designed.

1. Phoenix canariensis, Canary Island date palm is, as its common name indicates, from the Canary Islands, rather than, as its botanical name suggests, from Phoenix in Arizona that I left only last Saturday. Years ago, it was the second most common palm in the Los Angeles regions. Now, in this garden, it was the second most popular topic of questions.

2. Solandra maxima, cup of gold vine was the third most popular topic of questions as a result of this single bloom. It was about six inches wide. I wanted to get a better picture. Eriobotrya japonica, loquat was the most popular topic of questions. I took no pictures.

3. Aeonium arboreum ‘Albovariegatum’, variegated common houseleek is precisely what it sounds like. Most cultivars of common houseleek are as different in form as in foliage.

4. Salvia longispicata X farinacea ‘Mystic Spires’ is like the heftier version of mealycup sage. It provides splendid blue color, and is more reliably perennial than mealycup sage.

5. Bougainvillea X buttiana ‘Barbara Karst’ frames this arched parlor window colorfully. Anigozanthos rufus ‘Big Red’ kangaroo paw below tries to not obscure the outside view.

6. After all, this view is why this is View Park. Los Angeles has certainly grown up since I first saw it in about 1986, and it has grown much more since the old residence was built.

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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Cosmos

Cosmos has potential to almost naturalize.

For the past few years, I have really been overly indulgent with the seed catalogues from Renee’s Garden. I wanted to try more varieties of classic annual cosmos, Cosmos bipinnatus, than I could fit in my garden. I recently grew ‘White Seashells’ with tubular ray flowers, and colorful ‘Double Click’ with ruffled semi-double and double flowers, and even the ‘Dancing Petticoats’ mix, which includes several varieties! By now, I have probably grown all but a few of the many offerings.

After trying so many though, I still can not tell you which are my favorites. It would not matter much anyway, since I did not deadhead them to deprive them of their abundant seeds. Their self sown progeny are now mixed and beginning to bloom in random shades of pink ranging from pale pink to nearly red to nearly purple, with a few white.

Naturalized cosmos eventually reverts to bloom with more genetically basic single flowers in simpler shades of pink and white, on stems about three or four feet tall. They can even get taller than six feet and wider than two feet. Most of the popular garden varieties that I started out with though stay less than three feet tall. ‘Sonata’ is a popular strain that stays even shorter, so is among the most practical and proportionate for refined gardens.

Seed can be sown or new plants can be planted now to bloom through summer. Naturalized plants are already blooming only because they get an earlier start. Regardless of color or form, all cosmos flowers are about three inches wide, with yellow centers. Their finely textured pale green foliage is quite delicate and airy. 

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Some Exotic Annuals Self Sow

Periwinkle can naturalize a bit too aggressively.

It is impossible to say how long native wildflowers have adorned the natural landscape of California. Various lupines, California poppy and evening primrose had always been the most colorful wildflowers locally until they began to be displaced by exotic (non-native) plants only in the past two centuries or so. Although natives are remarkably resilient to dry summers and occasional wildfires, they are not very competitive with more aggressive and prolific invaders. What the natives and exotics have in common though is that they are so well adapted to local environmental conditions that they are able to perpetuate without much help.

Lupines, poppies and evening primrose, as well as native yarrow, godetia, and fleabane, may unfortunately need a bit of help if exotics want to move into their territory. In areas that are regularly or even only sometimes watered, weeding to remove more aggressive exotic plants helps the natives stay in control. They should otherwise do well on their own. Although without irrigation their growing season is much shorter, natives are slower to be displaced, since so many of the otherwise competitive exotics are not adapted to dry summers.

Many exotic flowering annuals are prolific enough to almost become naturalized, but are not quite aggressive or adaptable enough to get very far from cultivated landscapes. Cosmos, nasturtium, alyssum, catchfly (silene), four o’clock, gaura and foxglove self sow so readily that they are considered by some to be invasive. Some of us instead consider them to be ‘reliable’. They can be useful for unrefined parts of the garden that we do not mind watering, but otherwise do not want to put much effort into.

However, foxglove and even nasturtium can actually become noxious weeds in coastal areas not too far from here. I think that forget-me-not, feverfew, baby tears and English daisy can be problematic anywhere that they get enough water. Also, most annuals eventually revert to more genetically stable forms; which is why all varieties of dwarf nasturtium eventually bloom with the same yellow or orange single flowers. Yet, if we can distinguish between the plants that we can appreciate for their reliability and those that can be too invasive, native and exotic wildflowers and not so wild flowers can make gardening a bit easier.

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Timeout

A moment before sunrise over Phoenix.

Apologies for my absence.

Perhaps no one noticed. Most of my posts were automated prior to my departure, and I managed to compose a few brief articles for what was not automated; so ultimately, there was no lapse of posting. I may have only been negligent with response to comments for the last two weeks.

Realistically though, I have been intending to discontinue blogging and recycling old articles, and to post only my weekly gardening column, in two parts, on Mondays and Tuesdays. I merely have not done so yet.

Anyway, my trip, although very different from how it was planned, was totally excellent! Just a short distance from the turnoff for the southbound San Diego Freeway towards my primary destination in Los Angeles, I was diverted to my secondary destination northwest of Phoenix. I missed the desert scenery as I drove all night to arrive shortly before four in the morning, and began my vacation exhausted. Although I missed out on some of my plans in Los Angeles, I got more time in Arizona. The weather was weirdly excellent, with a weirdly torrential thunderstorm right in the middle of it. It was too early in the year to collect the seed that I wanted, but I really was not expecting to find any anyway. I did happen to procure a hedgehog cactus of some sort. I decided that, since my return was already delayed by a day, that I may as well delay it for two days. (I had brought some of my work with me, so was able to tend to it prior to my return rather than after.) Therefore, I came to my original primary destination in Los Angeles secondarily, stayed to help Brent with the View Park Garden Tour on Sunday, and returned home on Monday.

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New Zealand Flax

New Zealand flax provides colorful foliage.

Old fashioned New Zealand flax, Phormium tenax, is becoming increasingly uncommon. It is simply too big for compact modern gardens. Even without upright stems, its vertical and olive drab leaves can reach ten feet tall. They can flare outwardly as wide as fifteen feet. One cultivar is bronzed. Another is variegated. Both are somewhat more compact.

Most modern cultivars are either Phormium colensoi or hybrids of the two species. They are more compact and more colorful. ‘Jack Spratt’ grows only about a foot and a half tall, with chocolaty bronze foliage. ‘Yellow Wave’ gets about three or four feet tall with arching foliage with yellow stripes. Others are bronzed or striped with yellow, brown, red or pink.

New Zealand flax is remarkably resilient. The evergreen foliage is so very fibrous that it can be difficult to cut. Tough rhizomes that migrate where they are not wanted propagate easily by division. Some cultivars can revert by generating less colorful mutant growth. Since it is greener, such growth is more vigorous. It can overwhelm and displace more colorful foliage.

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Mediterranean Climate Is Quite Californian

New Zealand natives perform well here.

“Mediterranean” translates from Latin to “middle of land”. The Mediterranean Sea is in the middle of the land of those who named it. Other regions were either unimportant or unknown to them until the Sixteenth Century. Nowadays, most people of the World are aware of many other regions. A few of such regions also enjoy a Mediterranean climate.

Such climates are obviously not confined to the regions of the Mediterranean Sea. They merely resemble such climates. Some extend eastward into Western Asia. Others are in eastern and southern Africa, southwestern South America and Columbia. Larger regions of such climate are in southern Australia. The closest are here in western North America.

Even these limiting regional designations are debatable. Many horticulturists consider climates of New Zealand to be typical Mediterranean. Such climates are mostly between thirty and forty five degrees north and south. However, some might exist within northern India and southern China. Ultimately, climate is meteorological rather than geographical.

Mediterranean climates receive almost all of their rain during winter. Rain is very minimal through summer. Even if it is twice as abundant in other similar climates, it conforms to a similar schedule. Although winter chill is adequate for many species that need it, frost is mostly minor. Locally, summer weather does not often become too uncomfortably warm.

Native species know what to expect from local climate. So do exotic species from similar climates. Some may prefer more or less winter rain, summer heat or winter chill. Almost all can tolerate warm summers without rain, though. Such weather conditions are normal for them. Therefore, the most adaptable exotic species locally are from similar climates.

This includes species of Eucalyptus, Pittosporum and Callistemon from Australia. Aloe, Agapanthus and Morea are from South Africa. Phormium and Leptospermum are from New Zealand. Oleander and the various species of Lavandula are truly Mediterranean. In the past, a few exotic species adapted too efficiently to become invasively naturalized. Horticulturists are now careful to not import such potentially aggressive species.

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Simple Species

Unidentified cultivar of Tecoma stans

Tecoma stans is somewhat popular within the neighborhood where I stayed while in Arizona. It is available in nurseries also. I suppose that I could have purchased one or more for my garden. I had wanted to grow it for a long time. I refrained. I can explain.

The Tecoma stans that I can get from nurseries is an improved cultivar, or actually, about three cultivars. They are not the simple species, as it would be found growing wild. I realize that improved cultivars are known as ‘improved’ for a reason, but ultimately, I want to grow the simple species.

Crazy Green Thumbs sent me the seed for the simple species of Tecoma stans that I want to grow. That is all I need. Other colleagues have sent me seed, seedlings or cuttings for simple species of American beautyberry, American holly, American persimmon, pawpaw, red mulberry, red elderberry and perhaps too many other species to list briefly. In the future, I suppose that I could try cultivars of some of these species. I would like to get acquainted with them first though.

For most species, I suppose that I prefer cultivars. I want to grow the same ‘Moorpark’ and ‘Blenheim’ apricots that I grew up with. Eventually, I want to grow ‘John F. Kennedy’ rose. Cultivars serve a purpose also.

There are a few reasons why I want simple species rather than cultivars of some species. For American beautyberry, American holly and red elderberry, I want to grow what most other garden enthusiasts within the native ranges of these species grow merely because such species appear uninvited in their gardens. For American persimmon, pawpaw and red mulberry, I want to grow a few of the fruits that people enjoyed for culinary application prior to the development of relatively modern cultivars.