Surviving irrigation-free

Coleonema pulchrum, a commonly irrigated landscape plant,  growing irrigation-free in Oakland
Coleonema pulchrum, a commonly irrigated landscape plant, growing irrigation-free in Oakland

There are so many plants of the landscape that we assume are water-loving because they are never given a chance to prove otherwise, and because we don’t look into their native growing conditions to see just how little water they need to grow and thrive. Coleonema pulchrum is just such a plant. With its chartreuse leaves and pink flowers, it’s a much-loved plant in Northern California, offering a bright spot within what could be a washed-out landscape of dull greens and grays. Yet what folks probably don’t know is that this plant is native to a summer-dry, winter-wet region of South Africa and thus for many months out of the year has to tough it out with no water.

Indeed, even a drought-tolerant plant will need water up front in order to get established, but once established, the watering can be phased out, and the plant will thank you for it. Plants that are native to regions where drought is simply part of the climate oftentimes simply cannot absorb enough water from irrigation if they are watered during their period of dormancy as their root systems go into a sort of slumber during this time. In a worst-case scenario, their roots will rot, or the plant will grow much larger and faster than it should, ultimately opening out on itself and taking on a leggy appearance that no one particularly likes.

In our inveterate efforts to show that irrigation-free is all around us, we hope that folks will start to open their eyes to other plants they’ve seen growing irrigation-free and doing just fine.

When a forest isn’t a forest

A prairie savannah in what had recently been forest in Phil Hardberger Park, San Antonio, TX. Photo from the Phil Hardberger Park Conservancy.
A prairie savannah in what had once been forest in Phil Hardberger Park, San Antonio, TX. Photo from the Phil Hardberger Park Conservancy.

We so often think that forest is the natural result of just letting nature be and that to see forest is to see an indication of a healthy ecosystem. Yet we forget that many ecosystems are actually not forest-based at all, or else they are a mix of forest and other types of ecologies, such as grasslands and prairies. Years of fire suppression and mismanagement in the US have actually allowed many formerly grassland and savannah (mix of grassland and forest) ecologies to become completely dominated by forest, which is then often dominated by one or two species that have simply outcompeted everything else.

This scenario was very much the case within what is now Phil Hardberger Park in San Antonio. Years of fire suppression, grazing, and dairy ranching on the site had turned what had once been prairie, prairie savannah, and some forest, into basically all forest. So embedded had the forest look and feel of the area become that within the local narrative of the place people simply saw it as natural and having always been there. Recently, when the site was to be re-envisioned as a park, designers and ecologists had to contend with vast stands of juniper that had worked their way in and basically choked out native grasses, oaks, and perennials.

This foresting of places that were never forests to begin with is nothing new in American history. In fact, much of California was grassland before European settlers arrived. In his book, Trees in Paradise, Jared Farmer writes that settlers coming to the Far West wanted to “complete” the land by foresting it. “They forced grasslands and wetlands to metamorphose into fields, orchards, and garden cities,” he writes. To use a term of the time, they “emparadised” it. These longstanding efforts, combined with years of fire suppression, have transformed parts of California into hybrid manmade-natural tree-dominant ecologies that didn’t exist prior to the arrival of the Spanish some 450 years ago.

Of course, the lessons we can learn from these examples are not that trees don’t have their place in spaces where perhaps they once didn’t grow. Our urban and suburban landscapes are brimming with things that didn’t used to be there – pavement, right angles, roofs, to name a few – so to make the case that trees shouldn’t be there because they weren’t there before doesn’t really hold water. Not to mention that we need street trees more than even, given the realities of the urban heat island effect and climate change. Yet when it comes to our less urbanized and wilder spaces and places, rethinking the role of the tree in ecologies that were not ever forest is a much-needed endeavor. To restore these places back to prairie or Savannah is a way of ensuring that they are able to grow and evolve in a way that ultimately reaches a balance, so that one species – such as juniper – doesn’t become so dominant as to prevent biodiversity from flourishing. As a result, intense, long-term maintenance of the space does not have to be a prolonged and expensive reality.

Goldenrod, a sign of now

An illustration of goldenrod from the Macmillan Wildflower Book, 1954
An illustration of goldenrod from the Macmillan Wildflower Book, 1954

Late summer and early fall in much of the country are characterized by golds and purples, if you know where to look. In fields, prairies, vacant lots, and roadsides, the gold of goldenrod makes its determined and brilliant appearance. Growing from spring through summer, slowly sending its flower buds forth, it finally bursts into explosions of gold when many plants have long finished flowering and are already getting ready to slow down for winter. Bees and butterflies then flock to its flowers, stocking up on pollen and nectar before hunkering down or flying south. And then, just like that, the spectacle of color is over – or seemingly so – as a new spectacle then appears: birds, coming to feast on the seeds.

While some goldenrods do look a bit on the weedy side at times, we can forgive them for that, because everything else about them is, well, golden. For further reading, we cannot think of a better writing on this amazing plant and flower than the poem “Goldenrod” by Mary Oliver. You can read that here.

Rethinking the magnolia

Two dead magnolia trees in Alhambra, California. Victims of drought and a lack of foresight.
Two dead magnolia trees in Alhambra, California. Victims of drought and a lack of foresight.

While past peak, the years-long drought in California is showing its effects in slo-mo delay, coming on in the form of many a street tree stressed to the point of just not being able to take it anymore. Nowhere can this phenomenon be seen more than in Southern Calfifornia, where one of the street trees hardest hit has been the southern magnolia / Magnolia grandiflora. A tree native to the rain-abundant American South, it probably never should have been planted in Southern California at all, where rainfall is typically a scant 12 – 15″ during a good year. But, alas, like so many consumer goods, trees come in and out of fashion, regardless of what practical considerations there may be. So in the ’50s and ’60s street upon street were planted with magnolias in places like Hollywood, and Beverly Hills, and Alhambra – all arid regions and all requiring that the magnolias be irrigated generously in order to survive and thrive. So when the watering bans then hit a few years ago and folks were told to let their lawns and parkways go brown, the trees were never ready for the suddenly parched conditions. Many became stressed, and now, some years later, many are dying. As a result, the cooling shade and outdoor-room-creating canopies will be lost, and we will be left with wide streets and excessive sunlight and heat.

A jacaranda, cactus, and yuccas growing and thriving in hot Riverside County.
A jacaranda, cactus, and yuccas growing and thriving in hot Riverside County.

While devastating for the character of so many neighborhoods and the quality of life of our cities, we need to view this loss of trees as an opportunity to rethink what we plant and how. Even before the drought and worsening global warming, LA was a dry place. This simple truism is not going to change in the foreseeable future, and thus we must start planting trees that can handle these hotter and drier conditions – and that can handle them for the long haul. All it takes is a little observation to see which trees are still pushing on and looking good. In the photo above, you can see that this jacaranda – a tree actually not considered one of the most drought tolerant – and its surrounding plants are doing just fine – more than fine – and this is in hot hot Riverside County, in a parkway space surrounded by heat-absorbing asphalt and concrete. What other trees do you see still doing well? What other trees that you haven’t seen could be invited in, to create amazing tree-lined boulevards for the 21st century? Mesquites, acacias, jacarandas, palo verdes, tristanias – and the list goes on. We cannot keep doing what we’ve always done; it’s simply not working, and we’re seeing our lack of foresight in the form of sadly dying trees and sunbaked parkways. Let’s do better this time around.

Weekend Viewing

No matter where people go, or where they must flee to, so many will turn to nature for comfort and refuge – especially when there are no other options. While folks in the modern world seem to be increasingly turning to their phones and social media for some semblance of that comfort, when the lights go out and your wired world goes dark, family and nature are our default comfort spaces to turn to. Perhaps nowhere can this natural instinct towards nature be seen more than within refugee camps, where people suddenly no longer have those creature comforts of home, or the option of turning towards Netflix or Facebook or the like to find some sort of modern comfort.

The above video is a fascinating look into how refugees in northern Iraq have managed to create their own calming green spaces within an otherwise unsettled environment. The very act of shining a light on these spaces and their creation serves to truly underscore the humanity of the people having to flee and live in these camps. And to further highlight the refugee’s efforts to carve out their own gardens amidst such troubling and tough conditions, the Lemon Tree Trust created a landscape for this year’s Chelsea Flower Show that was inspired by the resiliency of the refugees in these camps. You may find more photos of the garden by clicking here.