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Atlas Mountain Palm

Atlas Mountain palm resists frost damage.

Mediterranean fan palm is a shrubby palm, with a few small trunks. Atlas Mountain palm, Chamaerops humilis var. argentea, is an even shrubbier variety. Mediterranean fan palm can grow slowly to about twenty feet tall. Atlas Mountain palm grows even slower to only about eight feet tall. Its several trunks become strikingly sculptural only after many years.

The primary allure of Atlas Mountain palm, though, is its distinctly silvery gray foliar color. Individual fan shaped leaves may be nearly two feet broad, with deep and narrow clefts. Petioles are so nastily thorny that grooming and pruning can be painfully difficult. Mature trunks can be six inches wide with dense coats of petiole bases. Bloom is not prominent.

Atlas Mountain palm is notably undemanding. Once established, it does not crave much water or fertilizer. Nor is it finicky in regard to soil quality. It is resilient to both extremes of heat and cold. After several years, it might benefit from thinning of superfluous trunks and pups. Like many palms, Atlas Mountain palm should perform well within big pots or tubs.

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Shore Juniper

Shore juniper is a ground cover that can cascade splendidly.

Like so many other junipers, the old fashioned shore juniper, Juniperus conferta, is recovering from decades of a bad reputation. Through the 1950’s and 60’s, junipers had been so overly common and were so commonly planted where space was insufficient for their mature size that just about anyone who enjoys gardening now likely knows how irritating prickly juniper foliage can be, or how to remove overgrown junipers. I prefer to blame the icky tam junipers for this.

Now that they are actually regaining popularity, junipers seem to be commanding more respect; perhaps with the exception of tam junipers, which are just as useless now as they ever were. Junipers that grow into small trees are getting planted where they can be appreciated for their sculptural forms. Shrubby junipers are being employed as informal barriers where they do not need to be pruned for confinement. The shore juniper, like other low growing or creeping junipers, is a practical ground cover. Mature shore junipers spread about six feet wide without getting deeper than a foot. The finely textured bluish green foliage is actually a bit more bristly than it first appears, with small pine needle shaped leaves. The soft berries are lighter grayish blue to purplish black. ‘Emerald Sea’ has greener foliage that seems to be a bit more lax. ‘Blue Pacific’ has denser and more bluish foliage.  

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Colorado Blue Spruce

With such densely foliated low limbs reaching the ground, Colorado blue spruce functions as much as large shrubbery as a small tree.

Colorado and Utah share the same stately state tree; the Colorado blue spruce, Picea pungens, which is native to the Rocky Mountains between Arizona, New Mexico and southern Idaho. Colorado blue spruce are stoutly conical trees that grow slowly to eventually get more than seventy five feet tall. Where they need to compete with other trees in forests, the biggest are nearly twice as tall with trunks nearly five feet wide. However, because they grow so slowly, and do not get much bigger then they need to, well exposed trees stay proportionate to home gardens for many decades. Many shrubby compact cultivars actually stay less than ten feet tall. Foliage can be grayish green to silvery pale blue. The stiff and sharply pointed needles are about three quarters to an inch and a quarter long, and densely set on relatively rigid stems.

The elegant silvery blue foliage of the Colorado blue spruce is striking either in front of or behind darker evergreen foliage, like that of redwoods or junipers. These stout and densely foliated trees make any garden look a bit more woodsy.

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Burro’s Tail

Burro’s Tail is old fashioned, but can also be contemporary.

Back when big spider plants or Boston ferns suspended in fancy beaded macrame were all the rage through the 1970’s, burrow’s tail, Sedum morganianum, was an unusual but also trendy succulent perennial for sunny spots in the home or sheltered and slightly shaded spots in the garden. The refined foliar texture and light bluish green color contrasted nicely with the big and deep green leaves of comparably trendy philodendrons. The thin stems are too limber to stand up, but cascade excellently. Plants in the garden that get pruned back while dormant in winter can easily get two feet long through summer. Without pruning, big plants can get longer than six feet. Pruning scraps and even the small but plump leaves can be rooted and grown into new plants. It is impossible to prune or even move burro’s tail without dislodging some of the leaves anyway. Watering should be regular but not excessive, but then minimal for plants in the garden through winter.

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Six on Saturday: No Flowers – Again

These pictures seemed to be interesting when I took them. Only now I notice that there are no flowers here. Actually, there are not many flowers in the landscape where these pictures were taken anyway. Until last year, the facility associated with the landscape was used mostly during summer; so most flowers were selected to bloom during summer. Winter can be quite bland.

Also, for such a mild climate, winter can be surprisingly cool in some cooler exposed locales. Mild frost is normal. On rare occasion, if the weather is just so, puddles can get a thin layer of ice.

1. Lemon ripens this time of year. This pale greenish yellow color will become brighter yellow soon. I suspect that these are ‘Eureka’ lemon, but they crop very heavily in season, like ‘Lisbon’.

2. Flowering cherry will be spectacular in spring, but looks horrid now. This particular tree does not defoliate completely until just prior to bloom. It does this annually. This tree is ‘Kwanzan’.

3. Silver wattle is an an aggressively invasive exotic species locally. Fortunately, there is not much within the landscapes here. Now there is even less. I know it will regenerate from its roots.

4. Argyle apple is a silly name for this Eucalyptus cinerea. It grew from the lignotuber of an overgrown tree that was discarded from a retail nursery in Los Osos. The silver foliage is striking.

5. Lawson cypress also has strikingly silvery foliage. It is not as silvery as that of Argyle apple, but is slightly more bluish. The color of both species seems to be more striking through winter.

6. Ice is rare here, but possible. Of course, it is not as bad as it looks. It is very thin. Winter weather is innately mild here, which limits cultivation of apples and pears than require more chill.

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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Blue Spruce

91225For a tree that is native to the upper elevations of the Rocky Mountains, blue spruce, Picea pungens, does surprisingly well here. It only wants to be watered a bit through summer to compensate for the lack of rain and humidity in chaparral climates. It does not seem to miss a more pronounced chill through winter. Disease and insect infestation are uncommonly noticeable or damaging.

Garden varieties are impressively variable. Some are like big shrubbery that stays below downstairs eaves. The biggest do not get much taller than thirty feet, and take many years to get so tall. Most but not all are stoutly conical. Color is variable as well, ranging from grayish green to silvery bluish green. The evergreen foliage is very dense. Individual needles are only about an inch long.

Blue spruce demands patience, planning and room to grow. Pruning for containment compromises their naturally appealing conical form. Therefore, even compact cultivars that do not need much space will need enough to mature completely. However, because they grow somewhat slowly, blue spruce may take a few years to actually occupy much of their space, and function as intended.

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Agave attenuata

60427Agaves are innately tough and undemanding. The main reason that they are not more popular in home gardens is that they are outfitted with nasty foliar spines. The worst of these spines are the distal tips of the large succulent leaves. Most agaves are also armed with shorter recurved spines on the margins of their leaves. Gardening with such well armed perennials can be dangerous.

A complete lack of foliar spines is what makes Agave attenuata such a deviant. The relatively pliable foliage forms big grayish rosettes that can get as broad and tall as four feet. Groups of these rosettes can slowly cover quite a bit of area. The plump stems below may eventually become exposed as they shed old foliage, but are they usually obscured as newer rosettes develop and grow.

The cultural preferences of Agave attenuata are also somewhat unusual. Unlike other agaves, it wants occasional watering and a slight bit of shade. If too exposed, it can get frosted in winter, or roasted in summer. Agave attenuata is also known as foxtail, lion’s tail or swan’s neck agave because its fluffy yellowish flower stalks curve downward, and maybe up again, to about six feet tall.

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‘Icee Blue’ Yellowwood

90313No, it is not an oxymoron. ‘Yellowwood’ is the common name for a few specie of Podocarpus. The evergreen (or ‘everblue’) foliage of ‘Icee Blue’ yellowwood, Podocarpus elongatus ‘Monmal’, really is as silvery grayish blue as the name implies. It can be as striking as some cultivars of Colorado blue spruce. It grows slowly in narrow columnar form to only about fifteen or twenty feet tall.

The finely textured evergreen foliage is ideal for both formal hedges and informal screens, although it takes a while to fill in, particularly for larger hedges and screens. Tip pruning of lanky growth of informal screens improves density. The narrow leaves are about two inches long. Fresh new foliage may be lighter and very slightly greener, which can contrast nicely with more mature foliage.

‘Icee Blue’ yellowwood will tolerate a bit of partial shade, but exhibits the best color in full sun. It prefers to be watered somewhat regularly while getting established. As it matures, it becomes less reliant on watering. Like many other Podocarpus, it is susceptible to infestation by scale insects and the ants that cultivate them. Scale produce sticky honeydew which blackens with sooty mold.

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Blue Festuca

90220To avoid confusion with dwarf fescue blue turf grass, Festuca ovina glauca is more familiarly known as blue festuca. If planted close together and left to spread as a small scale ground cover, it is much lumpier and mounding than uniformly spreading turf. It is a clumping perennial that is more popularly grown as distinct tufts of finely textured blue gray foliage that looks like gray sea urchins.

Either individually, or in small herds, these resilient gray sea urchins mix nicely with brightly colored flowering annuals. They do not need too much water, but can tolerate as much as annuals want. Their color is best in full sun. Partially shaded plants are greener, with longer and more pliable leaves. So are feral plants that rarely grow from seed. Modern cultivars are bluer than classic types.

The evergreen foliage does not get much higher than half a foot, with thin and less impressive floral spikes that stand a bit higher in summer. It slowly spreads wider, but before it gets a foot wide, it will probably be going bald in the middle. Overgrown or balding plants can be dug and divided into new smaller plants in winter. Old foliage that gets shorn in the process is replaced in spring.

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Rocky Mountain Juniper

70222It is no coincidence that many plants with gray foliage are from mountains or deserts. Gray foliage is ‘glaucous’, which, like glaucoma, diffuses light. This helps to protect it from desiccation and scald when sunny weather is also hot, windy or arid. The glaucous foliage of Rocky Mountain juniper, Juniperus scopulorum, is what distinguishes it most from related North American junipers.

Garden varieties of Rocky Mountain juniper are even grayer than wild plants. Some are even silvery. Also, they tend to maintain a somewhat symmetrical form. Most are compact, with dense evergreen foliage. Some loosen up with age. All want full sun, and seem to enjoy warmth. They lean away from shade. Color seems to be better if plants get watered occasionally through summer.

‘Skyrocket’ is very narrow while young, like a small silvery Italian cypress that gets only about fifteen feet tall. ‘Blue Arrow’ is similar, and becoming more popular because it is more resistant to disease. ‘Medora’ and ‘Cologreen’ are more bluish green. All get plump with age. ‘Wichita Blue’ and ‘Moonglow’ are more conical. ‘Wichita Blue’ is more bluish. ‘Moonglow’ is more silvery gray.