Back to Late Summer

Not posting regularly has me finding photos of some projects or outings that I forgot to share.

With a brief, mild winter ending down here, let’s take a warm August hike. There were some interesting scenes on an old streetscape design check-in, then on my weekly hike nearby.

It had rained nicely a few days earlier, and the Blue Ranger / Leucophyllum zygophyllum ‘Cimarron’ quickly developed its deep, purple flower haze. This happens many times each summer, days after any rise in humidity or even a light soak of rain.

I can almost feel the touch of humidity that softens and delays the daily heat-up. The rain-cooled air overnight lingers until at least 8 am.

With no AC running and my car windows wide open, the spicy but floral scent of these flowers is refreshing in a pungent way. All mixing with the notes of rain-scented creosote bush, for miles around.

There, several Blue Ranger shrubs contrast the olive green foliage of a single Creosote Bush / Larrea tridentata, that was retained. As well as their accenting the arc of the low wall; when not in bloom, their gray foliage stands out against the green of the Arizona species of Beargrass / Nolina microcarpa.

Ocotillo / Fouquieria splendens is a native woody but succulent plant, that contrasts other plants with an interesting texture. Unlike in the low desert, here at 4,000 feet elevation, it tends to stay in leaf until the fall cool-down – unless a persistent dry, hot pattern lingers after flowering.

The contrast with other plants during moist weather periods is another twist on seasonal interest.

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A preview to a future post is this view using a telephoto lens on my DSLR camera. See if you can spot the plants that look like gold mounds.

They are Pitaya or Haystack Cactus / Echinocereus stramineus. Their preference for steep, well-drained slopes in loose rock is not missed. I had a few good photos of the larger ones with me for scale, but now I can’t locate those – I’ll post when I find them. The largest haystack cacti on these slopes are up to 3 feet tall and 4-1/2 feet wide.

You can also see they have an attractive flower, when the conditions of rainfall and temperature align, and the sun is high in the sky – mainly between April and July here. These flowers were seen a few months before this August hike.

I continued on, into the last shade of the rocky area on the slope of Picacho, before returning to my car.

Finally, on the numerous sandy areas near my neighborhood, the perennial Devil’s Claw or Desert Unicorn Plant / Proboscidea althaeifolia comes to life, once the summer monsoon rains begin.

There’s another devil’s claw species in native to this area, ranging north into the sandier, desert portions of the Rio Grande valley of central New Mexico. But I still haven’t noticed it on any of my outings down here.

Do you see any unusual or seasonal plants like devils claw or haystack cacti, where you get outside?

Boyce Thompson – First Time

For years, friends and frienemies showed me photos of their trips to this unique series of garden spaces, that make up the Boyce Thompson Arboretum. In mid-winter, I finally visited.

It’s much more than a tree or plant collection.

They looked to be in the midst of a winter plant sale, to court all the midwestern and locals (transplanted midwesterners), who wish to add a few spiky plants to their winter home’s gravel expanse front yards. Or add to already-interesting desert gardens.

Aloes and other more subtropical, but dryland flora, greet the visitor within a few minutes of walking from where one buys tickets.

Did I travel all this way into the Sonoran Desert of southcentral Arizona, only to end up back home in my desert? Ha ha… you might notice some familiar plants, below:
Yucca rostrata / Beaked Yucca (blue form, unskinned per wannabe marketers)
Euphorbia antisyphilitica / Candelilla
Nolina greenei / Beargrass or Sacahuista
Hesperaloe funifera / Coahuilan or Giant Hesperaloe

Not to worry, as it’s simply another desert ecoregion that this garden can easily pull off, as it does others that you’ll see.

Most every smaller area at Boyce Thompson has a botanical and geographic theme, designed and placed in a naturalistic manner.

Each of those areas forms a garden, set into its surrounding, natural terrain. It’s then stylized or abstracted into a scene that one might expect in the wilds of that particular plant commuinity.

In some areas, I can’t tell if the plants were even planted or were simply worked around. As we head to Baja California Norte, the border of that Mexican state just west of Yuma, Arizona. That’s about 250 miles southwest of this garden.

Plantings native there, but which are adapted to this location, in a different subdivision of the same Sonoran Desert, transport us to that neighboring ecoregion. Queen palms or crape myrtles won’t.

Fouquieria columnaris / Boojum in various Sonoran Desert plantings, plus Brahea armata / Mexican Blue Palm, do the trick.

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Let’s go farther south geographically, so far that we’re in the arid, western parts of Argentina. That’s a hybrid of the Chihuahuan and Sonoran Deserts at similar latitudes south of the equator, but less extreme – less continental influences in their climate zones.

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“I don’t normally like golden barrels*. But when I do, it’s when they’re used well**.”
(*cliche; **and in a suitable climate)

More desert goodness includes:
Echinocactus grusonii / Golden Barrel Cactus under Prosopis velutina / Velvet Mesquite, plus various spikiness in front, including –
…..Agave americana / Century Plant
…..Yucca rostrata / Beaked Yucca (a green form, or ?)
…..Stenocereus thurberi / Organ Pipe Cactus (?)
Carnegiea gigantea / Saguaro and other Sonoran Desert flora
Populus fremontii / Western Cottonwood in the creek’s riparian forest

Walking down into that creek bottom, one of the curators stopped us visitors, to explain that we would need to wait to continue our walk. The path is closed at times, when the White-nosed coati move through that moist area. Here, a group of them were walking under that riparian forest and climbing about.

Waiting for the coatis to move through, late December fall color was enjoyed. And of course, once able to walk down there again, none of my photos of the departing coatis came out…

From more exotic plants blending in like they were always there, to steel and rebar handrails, all is smartly designed, built, or installed.

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This looks like Yucca rigida / Sonoran Blue Yucca, which is used occasionally in landscapes from El Paso and Las Cruces, upward to even Albuquerque. Adapted there, but native here.

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Walking across a foot bridge and above the creek, where we just were after the coatis exited, a trail took us along the north face of the adjacent hills and mountain. A more moist and less hot microclimate (mesic), upland plants grow at lower elevations than are typical.

These are plants that are more typical at elevations where I live, 4,000 to at least 6,000 feet in the Chihuahuan desert grasslands and nearby uplands. Some are probably native but others planted and long-ago established, blended in.

Below from upper left to lower right:
Quercus turbinella / Shrub or Desert Live Oak
Vauquelinia californica / Arizona Rosewood
Vauquelinia corymbosa ssp. angustifolia / Chisos Rosewood

Those broadleaf evergreens serve as large shrubs, or when thoughtfully pruned, dwarf trees that could translate nicely to small spaces. They are very suited to our high desert gardens, instead of denying that and (attempting) unadapted plants from Southern California, Tucson, or Dallas.

After all, isn’t a large goal for the garden to have an inviting space, by using materials and plants that actually like their placement?

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Once the trail area leveled out towards the end of our visit, we entered a final garden area, with plants I’m unfamiliar with. Subtropical and lush, it provided a welcome change from the rugged plantings elsewhere here.

Plant IDs are welcome!

That lush area led to this very pleasant paved area, where on can rest on the space-definining seat wall, to enjoy the partial shade and planting goodness.

The backdrop of Picketpost Mountain

But it’s time to leave, and get back to Tucson by daylight and cook up dinner for our group!

Have you visited a garden or gardens like Boyce Thompson? Or have you been here? Let me know in the comments.

Exploring A Unique Landscape in Tucson

I enjoyed two hours at an interesting building’s garden spaces, before driving home from a few days in Tucson.

I marked the University of Arizona School of Natural Resources and the Environment on my Google map to visit, though I forgot about this work on previous visits. Finally!

I first learned of Colwell Shelor, the landscape architecture firm who designed this property, when I temporarily relocated to the Phoenix area in 2019. There, I was reminded of a fellow garden blogger’s post covering the site and landscape design work at Western Spirit.

I’m certain these yuccas are Yucca rigida / Sonoran Blue Yucca.

Blues on rusts and tans: just right, so let’s go inside.

Hindsight – I could’ve captured the woman walking in more or a blur.

Standing out are the boomerang curves of seat walls (which also harden the edges), plant massing supporting it all (Salvia microphylla?), and Tucson’s love of bikes (even cargo bikes).

Also notable is the firm’s love of vines climbing or cascading along some of the vertical surfaces. Green on oxidized metal works nicely, as does green with white.

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This sheeting of small rock slabs reminds me of a similar effect on a small arroyo or three, that I’ve hiked along from the Gateway Trailhead in north Scottsdale. It’s also used at their museum project mentioned earlier.

I’ve never seen that occur in the wild near me or employed elsewhere, except by this firm. Hopefully, I have some photos of it in the wild from past Arizona hikes.

Inspiration – don’t leave home without it.

Before I go back downstairs and resume the four hour grind of I-10, I spied a young Platanus wrightii / Arizona Sycamore, starting to tower above those boomerang sitting walls. You can see that sycamore growing at the bottom of nearby Sabino Canyon, at a lower elevation than I realized.

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Quercus fusiformis / Plateau Live Oak is also used here, which will soon provide an evergreen canopy along the sidewalk and street. You’ve probably seen my own projects with that species, one of the few adapted oaks available from regional nurseries.

One can also note how this mix of spiky Dasylirion wheeleri, Opuntia engelmannii (or a close relative), and vines with live oaks frame the gracious sidewalk, guiding the route for pedestrians.

Yet, no signs of carnage that certain municipalities or contrarian designers imply, as issues with spiky plants in public spaces.

What I see is gorgeous function and form that reflects the southwest desert region, year-round greens, and the primary use of trees and succulents.

One of the firm’s principals, in fact, shared with me how they tend towards the use of only trees and succulent plants. To me, that would proactively bypass typical maintenance practices that are detrimental to the health, water use, staffing expenses, and aesthetics of shrubs and grasses.

Adios, dusty and soulful Tucson!

Trader Joe’s provisions-check, In-N-Out lunch-check, and gas station-check.

Until next time ~

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