The European Honeybee, EHB, and the Common Dandelion, are both ubiquitous in our modern urban lives though the one is portrayed as being both essential to our lives while its future is threatened and dependent upon our constant support. The Dandelion in contrast is a product of our disruption of the natural world and our very way of life and continues on as a pest species despite our efforts to ‘control’ it. They viability of the EHB is often linked to the continuation of a large population of Dandelion individuals. The EHB certainly benefits from the Common Dandelion finding ready individuals across our lawns and gardens, but the dandelion isn’t particularly dependent upon the EHB. The common dandelion, Taraxacum officinalis, is apomictic and doesn’t require pollinators at all. Apomixis isn’t a fancy word for ‘selfing’ or wind pollination either…what it means is that it, in lieu of an available pollinator, possess the capacity to skip over meiosis, the entire part of sexual reproduction in which an organism’s typical double, pair of chromosomes, which exist normally in all cells, and are known as diploid, ‘di’ for two sets of chromosomes, are reduced by half, to one set in ‘sexual’ cells, known as gametes, the sperm and egg cells, their chromosomes now ‘haploid’. Then, after pollination, the two haploid chromosomes are reunited uniquely through the process of fertilization. This is is the process skipped over in an apomictic plant. While it possess all of the ‘accoutrements’ of all flowering plants, stamen with their filaments and anthers, pistils with their stigma, style and fused carpels or ovaries, Dandelions are able to ‘short-circuit’ the process and produce viable seed on their own from their undivided, diploid, cells. Ever noticed how Dandelion seed heads always tend to be filled out? Perfectly spherical? Continue reading
Category Archives: Weeds
Controlling English Ivy and Clematis vitalba in the Landscape
I wrote the piece that follows while still a horticulturist working for Portland Parks about 20 years ago. It remains largely in its original form with a few additions, corrections and updates. Both plants are still under addressed in the landscape today. While employed I maintained my license as a public applicator of pesticides, a job requirement. I no longer have one, nor do I have a consultant’s license. In many cases herbicides can be an essential part of an effective strategy for the control of an established population of invasive plants. Invasive plants, like these, which are listed on your State’s Noxious Weed List, are there because of the the threat they pose to the environment and their capacity to infect and dominate a landscape, any landscape, across our region. In more than a few cases manual and mechanical methods of control alone are insufficient to ‘control’ the invasion and sole reliance on them will assure the failure of the establishment of a desirable landscape on a site. Herbicide use is thus justified. Large scale restoration projects are often dependent upon it. On a smaller residential property, with commitment and persistence, a homeowner may be successful, but even then they need to understand that there will be a continuing and significant threat of reinfection from surrounding properties, via birds carrying the fruit of Ivies and wind blown seed from Clematis. For some species, especially when the scale of the invasion and property are larger, its use may be essential. For many weeds this herbicide ‘threshold’ is very low before its use is a requirement. In this way scale works for homeowners as their properties and problems are smaller. Too often though properties are neglected and then the buyer inherits a serious problem. Using any herbicide will always have potential adverse effects on the environment, so if you choose to use it make sure you do so effectively. If you choose to use any of my herbicide suggestions, you are on your own. Do your research, understand your problem, to assure that your actions are effective, safe and responsible.
Getting Down to it: Your Viney Culprit is Probably Hedera hibernica, Irish Ivy, or More Rarely H. colchicum
English Ivy, a friend and co-worker announced early on in a then still continuing series of work meetings concerned with various issues of invasive plants, has been a kind of “anti-poster child” for those working in the regional conservation and restoration field. Its spread and control has been the subject of innumerable meetings, proposals and actions both fruitful and not. Eradication is no longer considered a realistic goal by many. The focus, rather, is on limiting its spread and control. Like other exotic invaders and introduced guests now run amok, from diseases to various shellfish and weeds, once a particularly well adapted species establishes a viable population base, it becomes a part of the disturbed novel landscape…it’s here and we’re going to have to figure out how to deal with it. This has always been the way of the world. The difference today is the rapidity with which these changes have been introduced through trade, the peripatetic travels of man (Man in the generic sense) and our never ending appetite for the consumption and disruption of land.
Cottonwood Canyon on the John Day River: Place, Plants and Experience
Massive lava flows pushed around the lower John Day and Deschutes rivers over the course of several million years leaving them to find and carve new routes, often next to the very ‘plugs’ that filled their former canyons! Today, deep below the layers of hardened basalt that form the palisades and ramparts projecting out in tiers from the smooth full curves that rise above us, we look through 15 million years of accumulated history. The fine grained basalt shatters and fractures in line with their mineral structure under the forces of water, weather and gravity. Sagebrush and grasses dominate revealing an oddly ‘netted’ pattern across the sloping canyon hillsides, lit by the often harsh sunlight, illuminating some kind of subsurface movement of the thin soils that soften the slopes. The ‘net’ looks as if it had been draped across the land then stretched sideways catching and snagging on what lies beneath in a never the same, but consistent repeating pattern. It shows best when the angle of the sun comes across the pattern, not when it hits it head on or when clouds make it too diffuse. Coarse falls of shattered basalt spill down to the canyon’s bottom always seeking their angle of repose. The sagebrush steppe plant communities cover the surface and in their richness and vigor speak to the soils beneath. Along seeps and drainages cutting verticallly down the canyon’s face, spring lasts weeks longer, and species crowd in that you won’t see other than near the river. The surface botanical palette in this way reveals what lies beneath…if one knows what to look for. Cottonwood Canyon State Park is a great place to observe this. Continue reading
Hiking at Riley Ranch Nature Reserve and Along the Deschutes River
It’s the edges, the margins, that always contain the most diversity. Large expanses of unbroken landscape take a portion of their character from their scale, a vastness, that the uninterested can often view as monotonous. Seemingly endless expanses of ocean, desert, prairies even forests, can lull some into indifference, a kind of blindness, in which they lose interest and fail to see the intricacy and richness of that which surrounds them….By overlapping two different landscapes places can take on a complexity that neither has alone…and may even arouse many of those inured to the natural world surrounding them. Two different landscapes sharing a common edge can form ecotones, where each landscape contributes species in patterns not found across the vastness of each alone. Cut a river through an arid landscape and it becomes altogether different often with stark changes within a few feet. Such is the arid canyon landscape of the Deschutes River immediately north of Bend, OR.
My ‘Droughted’ Weedy Lawn: What do I do With it Now?
We can do much better than we have been doing with our landscapes…we have to! It is incumbent upon each of us to grow our landscapes well, whatever they are, whatever they demand of us. Our inability or unwillingness to do this is symptomatic of a society today that doesn’t place priority and value on life, first! (If you are reading this, you probably aren’t part of this ‘we’.) The fact that we don’t have the time, resources or interest is indicative of how far out of balance our own lives are. This isn’t a new phenomenon. I don’t mean to shame or blame anyone here. Modern societies have long been out of step. We place a premium on our personal freedom, the idea that we have moved beyond nature, that technology will do for us whatever we need. Nature will keep ‘chugging’ on without us so that we can devote ourselves to our more personal goals…and so ‘nature’ has been left largely on its own as if what we do will have no significant or damaging effects…but that isn’t really the way it is. So, what do we do about that dead weedy lawn out front? Continue reading
The Droughted Lawn
[A reader asked me to do an edited down version of this article to make it more accessible for those less interested, but in need of its message. This is a stab at that.]
The suburban American lawn has been identified with the fall of nature by many. Today, a good and green American, certainly us Portlanders are included in this, rejects the perfect monoculture of the lawn. Nature:good; lawn:bad. Our lawns demand water that could be better used growing food and assuring healthy fish populations, our lawnmowers spew air pollutants damaging to us all, our fertilizers leach away and move off site contaminating ground water and stream flow while our pesticides used on them, more directly attack nature all around us, all of this for no justifiable benefit, only fulfilling some narrowly defined human desire for an outdated aesthetic. Detractors of the lawn argue against the waste of resources they require and they are difficult to justify if their purpose is restricted to providing a neat and ‘defensible’ perimeter for each house, the appetites of golfers and the youthful fantasies for power and dominance of sport, all increasing the consumption of land ‘stollen’ from nature to sate our hunger for it. But this view of the lawn does it a disservice. Continue reading
A Healthy Lawn, Drought Stressed Turf and a Meadow: Finding Our Way to a ‘Better’ Landscape
[The world is like a ball of string…pull on the loose end available to you, and you pull on the entire thing!]
Portlanders, Oregonians, often promote ourselves as being ‘green’ leaders. Cleaning up the Willamette, the Bottle Bill, preserving our beaches as public property, state mandated land use planning, bicycling, recycling, mass transit…and it’s an apt description…to a point. Combine this with our relatively low population, our huge, diverse and beautiful natural landscape, our progressive ‘weirdness’, and we are firmly on the national map, the envy of many places and a beguiling destination for those who find themselves looking for the laid back, ‘cool’ place, to be. Our environmental righteousness is intoxicating and clouds our own vision of where we are and the work to be done. A steady stream of new arrivals brings with them their own visions of Portland, based more on their own desires and marketing efforts than the on the ground reality, skewed by tinted glasses of Portlandia’s popularity, our own boosterism and the ‘boom’, probably transitory, commitment that big money has showered upon us. Our little town is not what it once was, if it ever was. But this is the nature of any place, it is many things, often contradictory, when looked at by its many very different inhabitants with their unique history’s and perspectives. Continue reading
This Life: A Memoir, Gambol and Botananomical Tale
I hope that you will forgive me this departure into verse, prose, whatever this is…another thread in my life. I don’t think it is too far amiss, because, after all, horticulture is the ‘art’ and science of growing plants. Originally I began this as an idea for a children’s story, yes I did, the life of a particular Dandelion, but, probably due to my more recent reading on topics like photosynthesis, cellular metabolism and a biophysics response to the question of, ‘What is life?’…it has morphed…considerably. When you read this, keep in mind that my intention was to write from the perspective of the Dandelion, a concept pretty incomprehensible to a modern American.
The Taraxacum Cycle
Stories all begin with a single word, a seed, around which they grow, nurtured over time by the things we all share in common, family, history and experience. They contain ‘truth’, but are not themselves true, because they must be told in such a way that they lure the reader in and are ‘believable’. They are organic and grow within us and to the extent that they reflect our own ‘story’, that they meet our expectations, we stay with them and them with us, because there is no story if it is forgotten. So, the author must manipulate what he knows, he must ‘lie’, to bring you in and keep you, weave truth and lie into a whole. We take the stories you already know and introduce our own characters, set them in exotic though familiar settings, and, if a writer is good, introduce enough, but not too much, that is ‘new’, different from your cultural experience, your expectation, that you are affected by its unfolding, that you become a part of the story and look at your world in a different way, even if only a little bit. The word here is Taraxacum. Continue reading
Weeds, Politics and Commitment- When Doing the Right Thing is Outside of the Box
[There is a recurring theme in several of my postings and that is the failure of various of our local agencies and departments to responsibly care for the landscapes that they are charged with, a responsibility that is secondary to their primary mission and priorities. The fact that this problem is so common is indicative of two things: first, that society views the ‘care’ of the wider landscape as a non-issue, that it is either somehow self-regulating, the mother nature thing, or, of such low importance that it need not be addressed, or some combination of these two, and, that our need for government accountability is so tightly defined and our mistrust of it, so deep, that our ‘exclusionary’ strategies utilized to accomplish this, eliminate the possibility that secondary responsibilities, i.e., those not directly serving the explicitly stated priorities, are excluded from any action or even discussion. Thus, an agency or department charged with specific transportation priorities will only respond to and act on issues of transportation efficiency and safety…not landscape concerns. My position is that this allows the uncontrolled spread of weeds and an overall decline of the health, beauty and vitality of the landscapes across the City within which we live, devaluing both the place that we live and the quality of lives we can enjoy.
The following is another example of one such landscape, in southeast Portland, this time a one block section of unimproved right-of-way, or roadway (UROW), a scenario that repeats regularly across this part of Portland, the difference being that the lack of vehicular traffic and the grade have allowed this property to grow in solid and has become impenetrable. Many other such properties are in use by vehicles with sections of them graveled and eroded, huge pot-holes turning them into obstacle courses, but largely free of heavy weed growth, or at least free of many of the larger more aggressive invasives that plague our area.
First, below, is a descriptive piece that I sent to Commissioner Novick’s office as well as Suzanne Kahn, PBOT Maintenance Group Manager. Next is the response I received from Cevero Gonzalez, Constituent Services Coordinator, with the Portland Bureau of Transportation and finally, my interpretation and response to that. Governments are very ‘conservative’ organizations and are risk averse, meaning they tend to do what they’ve always done avoiding creative solutions that put them outside their comfort zone. Very often this is exactly what is needed.]
There’s a short strip of ‘street’ a few blocks south of our home and garden at SE Schiller between SE 28th Ave and 27th. It appears to have never been paved. It’s not currently passable by vehicles of any type without engineering and improvements. It’s completely overgrown with several invasive plants and multiple weeds all of which have been left on their own for years providing a significant source of ‘infection’ for the neighboring properties. It is also a repository for trash. From maps this appears to be a City of Portland property. Continue reading
Failing Landscapes, Failing Practices: A Look at Tri-Met’s Landscapes and How We Could Do Them Better!
About a year ago I posted a series of three articles on Tri-Met’s landscapes along the new Orange Line. They were a critical assessment of their design with many photos and explanations for my criticisms. I had a brief correspondence with the project manager after the first two before he stopped responding. I had asked about the maintenance schedule that they had with the contractor who would be doing the work. I did not receive it. Part of the reason was mine, as new ideas came up for me, my interest wavered and I moved on. Still, I’ve never received anything. Now, a year later, I decided to reassess the first portion of the landscape that I wrote about, as it is a section I regularly walk and ride by bike to downtown or to just get out. I would encourage readers to see my previously posted reviews. Continue reading