Assisted Ecological Recovery: Working with Ecological Succession in a minimally invasive manner as a pragmatic approach to restoration
Over the years, restoration professionals have realized the best outcomes, within a given landscape context, don't necessarily start with the most physically intensive restoration actions such as bulldozing/ plowing, soil replacement, etc. We seek to strike a thoughtful and efficient balance of passive vs. active restoration work, and we intentionally use methods on the spectrum of assisted natural regeneration when and where it makes sense. For instance, if we're working on a site with poor clay soils, it may make sense to allow common 'aggressive' or 'weedy' native species, such as goldenrod, to be a major part of the landscape for years, as it can also be part of a celebrated and beautiful meadow landscape, as opposed to the alternative of putting in a lot of effort to battle against the proliferation of certain common native plants. In other words, we're not allergic to the idea of letting goldenrod, asters, and other of the most common meadow plants of the Upper Ohio Valley replace mowed lawns that are devoid of life, and in many cases, it might be a sensible prescription to let a species like goldenrod condition the soil for years, before actively trying to increase species diversity. This is also to say, we always want to be working with the actual, observable, real process of ecological succession; not a fake version (as adopted by most landscape architects today) which seeks to vaguely mimic ecological processes through intensive gardening. Also, there's good reason our reference communities/ targets for native meadows are different than they are in the Midwest; Canada Goldenrod, for instance, was historically a common meadow-forming plant in the Ohio River Valley, so it's dishonest to treat it as an "invasive weed" for the sake of conforming to Midwestern norms. Common Milkweed and its relative Hemp Dogbane, and various asters have a similar story of being aggressive, yet potentially welcome in some landscape prescriptions. And there are various common weeds that aren't native, but which are widespread in our landscape today, have been naturalized for hundreds of years, and offer important habitat value to native pollinators: plants like common teasel and Queene Anne's Lace. We don't necessiarily consider such common 'volunteers' problematic invasive species that are counter to our goals of recreating a self-sustaining "native", landscape, rather, we see such species as "practically native" or functionally native for the purposes of our work; they're part of our landscape now and don't need to be removed simply because they are a relatively recent addition to the landscape. Also, one of the reasons such plants are so prolific and widespread, is because they're so widely pollinated — they are loved by (native) pollinators. So yes, a few Common Teasel plants are acceptable in our vision of a prescriptive, successional nature. But we will of course try to manage to prevent the establishment of invasive introduced species, those which are both non-native and have a tendency to dominate landscapes and prevent native plants from establishing and regenerating; an abandoned field full of Cleveland Pear Trees, Autumn Olive, and Multiflora Rose comes to mind.
What We Don't Do
Use mass-produced, horticultural industry aesthetically-bred cultivars and or nativars which pose a direct risk to the gene pool of native, endemic plant populations, and which are a direct threat to the authentic native-plant conservation and ecological landscaping movement, in general.
Plant large, nursery-grown trees and shrubs, in straight lines, on mowed lawns, which will always have stunted growth, and be unoriginal in the landscape — we plant younger trees, plugs, and seeds, which take several years to mature and organically grow in relationship to each other and the site (regeneratively). We don't see planting large trees and shrubs as a feasible, cost effective strategy for most restoration sites, as a general rule with some flexibility. Native trees can only be grown in a pot for a maximum of a few years before they become root-bound and of inferior quality.
Pretend that all impacts of non-native species are always a net negative on environmental outcomes (the ecological and environmental role of introduced species is often more complex and more quickly-evolving than traditionally portrayed, with many introduced plants having a profound ecosystem services role on large scales, such as cleaning urban watersheds and stabilizing highly disturbed stream banks and roadsides). While we do not discount the serious, even somewhat dire impact of invasive species in the broader landscape, we also don't think the Science of 'invasion biology' will age as simplistically as it started; we think a native/ invasive lens is an extremely valuable theory and tool for restoration, but we don't think the actual science of Ecology and net ecological impacts of invasive species, over broader spatiotemporal scales, are as black and white as described in most of the literature to date. Introduced species now make-up a common part of our landscape, which is all the more reason we need to broadly re-establish native landscapes now, wherever and however we can, as our regional ecosystem ultimately derives it's health and ecological stability through scale. For example, it's much easier to replace a large mowed lawn with a regenerative native plant landscape than to effectively bulldoze an established patch of Japanese Knotweed. Like running a marathon, the efficiency of ecological restoration is something that conserves energy on uphill stretches, and sprints downhill, necessarily, to win the broader race at the marathon scale —engaging 'flows' and going with the momentum of ecological succession is central to our philosophy. (Many of the concepts on this site came from my unpublished/ unfinished Master's Thesis work in restoration philosophy, so please do not copy them without citing me. SER 2013, Ruggiero, D. Contextual Ecological Realities and a Practically Restored Nature: An Evolutionary Framework Suggests a Minimally Invasive Restoration Ecology).
Pretend that common 'weedy' native species like Canada Goldenrod, Black Locust, and Black Walnut are not some of the most common, beautiful, native, habitat-generating plants of the Upper Ohio River Valley (such species are often considered unwelcome weeds in Midwestern restoration circles).
Strictly conform to the norms and goals of prairie restoration as it's traditionally practiced in the Midwest, but we do borrow heavily from it and seek to create healthy meadows as a starting point for regenerative landscapes.
Traditional landscaping with native plants, such that we constrain native plants in boxes of traditional lawn & garden design.