Ten New Year’s Resolutions For Your Eco-Garden

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Conjuring up some New Year’s resolutions? Don’t forget about your yard and the ecosystem of which we are a part. Promise to do something positive in your yard this coming year to help dwindling wild species whose habitats have been—and continue to be—ravaged.

You certainly don’t need to replace every plant in your yard or eliminate all of your lawn to give back to nature, although the more the better. And you don’t need to do everything all at once—baby steps are fine! In fact, incremental change is usually best, since wild species using existing plants and other elements might be harmed by a drastic, rapid change. If you don’t have a yard, think about volunteering with an organization that’s working on a restoration project—it can be satisfying and enjoyable.

Here are ten resolutions I recommend to help make your yard more humane and functional in the coming year. Some are very easy, some not quite so much. Choose one, two, or all! They are not listed in any particular order because each one is important.

Add some clean water. Birds, insects, mammals, amphibians—all creatures—need water year round to survive. Even just a shallow bird bath can help, but some maintenance is a good thing: Change the water every few Bird bath robin babydays, give it a good scrubbing every week or two, and keep it out of reach of marauding cats and dogs. Plates or shallow bowls filled with clean pebbles or gravel and water will provide for insects; butterflies will also appreciate mud puddles which they use to obtain moisture and nutrients essential for breeding. Artificial ponds should be shallow on one side and have gradually sloping sides so tiny animals can get out easily. More tips here.

Let natural systems flourish and harmonize by minimizing “clean-ups” and maintenance. Yes, this one lets you work less! Allow fallen leaves to stay on the soil to create cover for overwintering insects like bumblebees and butterflies as well as food for birds, raking or sweeping them only off areas that need to be clear (like sidewalks, driveways, or lawn). Leave dead wood such as snags (dead or dying trees that won’t crash on someone’s head) and “downed wood” —fallen branches, twigs, and bark—which is absolutely essential wildlife habitat that will protect and nurture soil, too. Create brush piles or rock piles to help provide cover and nest sites for birds pilesand other small creatures. Leave seed heads and flower stalks on perennials until spring is well under way to provide food, cover, and habitat. If/when you eventually cut them back, leave them on the ground for a month or longer in case they contain native bee larvae or other overwintering insects waiting for the chance to live out their lives.

Get rid of invasive plants that compete with natives. Depending on the plant species, this can be an easy job or one likely to give you headaches, backaches, and an urge to scream. It can take a few days or a few years. But once your task is accomplished, I guarantee that you will feel an extreme sense of satisfaction. And there will be more room to plant lovely, functional plants! If you have several invasive species in your yard, determine which may be the most invasive and start with that. Nonnatives that produce berries, like English holly trees, are particularly problematic because they spread into nearby natural areas by birds, but also via vegetative reproduction. English ivy also produces berry-like fruit and spreads by rooting on the soil surface and on tree trunks—at the very least, periodically cut it back at the base of trunks to prevent it from harming trees. There are numerous introduced plants that push out native species, so check with city, county, and/or state agencies to find lists and descriptions of invasive plants in your area; the USDA also offers information. My book offers some tips for removing invasive plants, as does Green Seattle Partnership and this post.

Remove lawn. Lawn for the sake of lawn is not beneficial and is awfully wasteful. When deciding which part(s) of your lawn will receive walking papers, start by choosing areas that you never or rarely use. Often this is the front yard. If you’re not ready to go all the way and remove a large area of turf, consider at least removing lawn under trees and in areas that are difficult to mow, such as slopes. Lawn can also be minimized by enlarging existing beds and adding ecologically beneficial native plants. The gentlest way to remove lawn is to simply cover it with about 6 sheets of overlapping newspaper (or cardboard) on a non-IMG_0403 sRGBwindy day. Dampen it, poke a some small holes, then top it with 4 or 5 inches of weed-free compost (leaf compost is good) and fallen leaves over that. Leave it to decompose for at least several months (until grass roots have died) before planting. Removing lawn via a sod cutter or spade can damage tree/shrub roots.

Grow native plants that are indigenous to your area. For this I suggest you consult a regional native gardening book like my book (if you live in the Pacific Northwest, west of the Cascades). Choose species (preferably “true species,” not cultivars) that are native to your area and that will flourish in your site’s soil, light, and moisture conditions. Grow them with other members the same plant community to provide the most benefit.

Provide for all life stages of pollinators. Many pollinating insects, including native bees and butterflies, will have gone through several stages by the time they reach adulthood and their needs differ greatly. So, in addition to providing water and growing groups of sequentially-flowering plants (preferably native to your area) that supply pollen and nectar from early spring through fall, provide the “host plants” needed for egg laying and for the feeding of larvae (in the case of butterflies and moths: caterpillars). For insects that undergo a complete metamorphosis, protect habitat for pupa (chrysalis). The latter mainly involves simply leaving fallen leaves and other organic matter on the soil, delaying any pruning of host plants until late spring, and not using leaf blowers, which eliminate the habitat of creatures needing a place to wait out the winter, such as chrysalis held in place on a twig by a fragile silken thread.

Don’t use pesticides or poisons. Synthetic pesticides should be avoided at all costs, but even so-called organic controls can be deadly and indiscriminate, especially if used improperly. If a pest if causing enough damage in your Aphid eaterkitchen garden to warrant a control, consider hand removal, barriers and screens, companion plants, or simply sprays of water from the hose. Allow a natural balance by welcoming natural pest control such as birds (see bushtit devouring aphids, right) and predatory insects. More than two billion pounds of pesticides are sold each year in the U.S, which severely threaten pollinators — without whom we can’t produce food — and damage water and soil quality. 

Protect birds from reflective glass. Up to a billion birds are killed or injured by colliding with buildings in North America each year. Though skyscrapers kill countless birds, large structures four stories or less in rural locales are responsible for the most bird deaths, according to a 2017 study. Many of those strikes can be prevented and here are some ways to help.

Keep Kitty indoors. Domesticated cats kill millions of birds each year, but it’s not their fault they’re outside. Whenever possible, keep your little predators indoors for their safety as well to protect little wild creatures. To prevent boredom and health issues: Add levels, especially around windows, widen windowsills with tables of appropriate height, or add window boxes. If you’re more ambitious, build a catio! They come in all sizes, shapes and price ranges and provide kitty with a safe outdoor experience.      

Turn on the dark. Look out your windows at night and chances are—if you live in an urban area—you won’t see the twinkle-twinkle of little stars because light pollution (any adverse effect of artificial light) is making the night sky glow brighter each year. Its most obvious effects are on migratory songbirds lured into cities where they collide with unnecessarily illuminated buildings, killing more than 100 million of them each year in North America. But lit up low-rise structures in rural locales also distract and have been found to pose greater danger than similarly-sized urban buildings, with what researchers call “the large scale beacon effect.” And for nocturnal animals, artificial light may be the most extreme change forced upon them. You can help by minimizing artificial lighting migration seasons, and anytime to prevent moths from exhausting themselves to death, to keep bats in the dark, and diurnal animals asleep. Choose fixtures that shine light downwards, not to the side or upwards, and use motion-sensors so that lights go on only when necessary. If you worry about crime, studies show that outdoor lighting does not decrease crime and may even exacerbate it; most residential crime occurs during daylight hours. In addition, cover windows with shades or draperies at night to cut down on light escaping your house. More info.


© 2017 Eileen M. Stark

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Remove Invasive Plants: It’s Good for Wildlife and Gardens

English ivy (Hedera helix)

A little neglect goes a long way (English ivy takes over).


I’m embarrassed to admit
that when I first moved to the Pacific Northwest in 1990, before I knew much about regional native plants, I thought that foxgloves were native plants. Why? Because I encountered them in natural areas. Luckily, I know much better now and—with the exception of some infrequently traveled trails in remote corners of the world—I cannot remember a hike where I haven’t encountered invasive plants (and sometimes a terribly large number of them). Areas close to urban areas are hardest hit, but even ecosystems far from the madding crowd can suffer from their effects.Digitalis purpurea

Invasive plants are nonnatives that were—and continue to be—brought here either intentionally by the nursery trade (or agriculture), or accidentally (as packing material and such). Thousands of species have been brought to North America, and many of ours have been sent abroad. All this rearranging of the earth’s flora started innocently enough centuries ago, but experts fear that it’s reached a point where biological diversity is severely threatened and essential interactions, like pollination, are damaged. Foxglove (Digitalis purpurea), as lovely as a biennial can be, may not be one of the worst offenders, but it doesn’t stay put with its countless tiny seeds, and shows up in places it doesn’t belong, basically making life miserable for the native plants that do. More problematic species often reproduce in several ways: For example, Himalayan blackberry and English ivy (shown in top photo) and its cultivars spread via rooting stems and by fruits eaten and dispersed by wildlife. Both suppress and exclude native vegetation and form dense monocultures that are unsuitable as wildlife habitat. English ivy is capable of one other feat, if left alone long enough: Killing entire trees.

Of course, not all nonnative plants pose horrendous problems, but those that do run amok are able to because whatever keeps them in balance in their native land—soils, predators, pathogens or weather conditions—are lacking here. Consequently, they do so well that they’re able to spread fairly easily from yards or agricultural areas into natural areas that support native species that can’t compete; the natives have no defense, become overwhelmed by the newcomers, and die out. This is particularly devastating for uncommon or endangered plants close to extinction. In addition, the spread of invasives (plant, animals, and pathogens) has economic ramifications.

Deadly for wildlife
While habitat loss due to deforestation, urban sprawl, livestock grazing, and agriculture is the greatest threat to the variety of life on Earth, invasive plants contribute greatly to the tragic loss of biodiversity. Since native plants are essential for native fauna (especially insect herbivores, most of which are specialists that can only use a certain plant or plants due to their chemical makeup), when natives are gone, so too are the herbivores and the higher life forms that feed on them. And, needless to say, fauna use native plants for other essentials, like nesting habitat and shelter.

Some nonnatives are also poisonous. It’s not unusual for cedar waxwings to be poisoned by the fruit of heavenly bamboo (Nandina domestica). And during a recent winter, many wild elk and pronghorn died horrible deaths in Idaho after foraging on Japanese yew (Taxus japonica), which is considered invasive in some states. Hungry bears also have been poisoned in Pennsylvania by English yew (Taxus baccata), and other animals—including livestock and people—can also be poisoned. Instead of nonnative yews, we can plant regional/local yews that wildlife coevolved with. The Pacific Northwest’s yew, Taxus brevifolia, which provides food and cover for many wild species, is the best choice from British Columbia to northern California and east to Montana, at mid to high elevations. Sadly, this attractive understory shrub that grows beneath conifers is in trouble due to over-harvesting for medicine, as well as the logging industry.

Hard work pays off
Research from the Seychelles, an archipelago in the Indian Ocean, shows that sweat and funds invested in eradication can pay off for all sorts of pollinators (bees, butterflies, beetles, birds, reptiles), for the native plants themselves, and for an entire ecosystem. Following the removal of nearly 40,000 invasive shrubs on four mountaintops on one island, researchers monitored the remaining native plants for visits from pollinators. Eight months of observation later, “Ecosystem restoration resulted in a marked increase in pollinator species, visits to flowers and interaction diversity.” Essentially, even during the rather short test period, it was found that both the number of pollinators and their interactions with plants and each other were over 20% higher in the test areas than in control plots (where the invasive shrubs had been left alone). And, the test area native plants also produced more flowers and fruit than those in control areas. Restoration works!


WHAT YOU CAN DO

Eradicate them. Early detection and removal  is crucial to stopping an invasive plant in its tracks, especially if you live near a natural area. To make it feasible, and if you have a variety of invasives, pace yourself—perhaps get rid of one species a week (or one a month or season, depending on the infestation). I strongly recommend forgoing pesticides (even so-called natural ones) and manually digging them out whenever possible. Digging when the soil isn’t saturated is best, to prevent destroying the soil structure that results when working wet soil. And if your arch-enemies grow on a steep slope, be sure to replace them with native erosion controllers (Oregon white oak, madrone, red alder, oceanspray, red-twig dogwood, Nootka rose, kinnikinick, salal, sword fern, etc.—whatever species are local and will do well in the light and soil conditions) as soon as you can; a biodegradable jute netting can be laid down to prevent erosion while new plants fill in.

At the very least, cut stems off at the soil level well before plants go to seed (it can happen quickly!). This method doesn’t disturb the soil (which can invite the germination of more weed seeds and steal moisture) but it can be tedious. Some species can be cut to the soil level and then be covered with a dark cloth like a dark thrift-store bedsheet to block out light (not plastic, which will prevent moisture from reaching the soil and kill soil life). Left for a year or so, it will prevent photosynthesis; afterwards, check to see if you need to dig out any live roots. Persistence usually pays off. In hard to reach places, such as beneath tree or shrub roots, repeatedly cut down or yank out leafy stems—eventually the plant will die from the lack of energy that sunlight provides. The morning glory vines that come from under a dense shrub in my yard get weaker every year because we continually pull out what we see. I seriously think this year may be their last.

One exception to the get-it-out-as-fast-as-you-can rule: If the invasive plants are providing some habitat for wildlife (nesting sites or food or cover), do a soft eviction and take them out gradually or incrementally, after nesting season, rather than all at once. This will avoid completely eliminating the habitat and causing undue stress to wildlife.

Please note: If you need to eradicate English ivy that’s climbing on a tree, cut the vines at the base of the tree but don’t pull it off the bark because bark can be damaged and possibly contribute to a tree’s death.

Herb robert (Geranium robertianum) an invasive plant

Stinky Bob: Pretty, but very assertive in natural areas & gardens.

Remember that some seeds can survive for many years. When I first started gardening in my yard, there were a lot of Robert’s geranium (Geranium robertianum) a.k.a. “Stinky Bob”. I made sure I pulled all the plants before seeds had set, but the next year they were back due to previous years’ seeds. I pulled them again and again, always before they flowered. Fifteen years later, I’m still pulling, but this year there were only two plants! Moral of the story: some seeds can stay viable a very long time, so don’t you dare let up on your weeding. But of course neglected neighboring yards can supply seeds as well, so it’s a continual process. Before planting natives, wait at least a year after the initial removal. Weed again, and then plant. It may not eliminate the seeds, but it should cut down on future seedlings and give the natives the best chance at taking control again. Growing assertive natives, those so-called “pioneer species”  or “early seral” plants generally will be better at competing with weedy non-natives.

Know what you’re planting. Don’t buy newly introduced plants that lack a track record, or seed mixes that may contain invasive seeds, especially ones labeled just “wildflowers.” If you want a wildflower meadow or prairie-style garden, buy only seeds that you know are native to your location and you won’t have to worry. Even though many native “pioneer species” (especially annuals) can be quite assertive, if they spread enthusiastically they won’t wreak havoc on the environment. Species from different regions of the country can be problematic, not just those from Europe or Asia, so go with only your local native plants whenever possible.

Speak up if you notice plants for sale that are problematic.  I’ve seen Arum italicum and Vinca minor and many others for sale at local retail nurseries, even though they’re on my city’s “Nuisance List” (and I’ve seen Stinky Bob, too!).  The thing is, just because plants are deemed invasive or a “nuisance” species, doesn’t mean they can’t be sold—the only plants that are illegal to sell in a particular state are those that have been officially listed as a state noxious weed. But if enough of us educate retailers, hopefully they will pull the plants from their catalog/store.

Besides eliminating invasives in our yards, we need to be very careful about what we’re dragging into natural areas on our hiking boots or sneakers. Plant material like seeds can get stuck in the tread of shoes, and some stick like velcro to laces, like the seeds of the aptly named forget-me-not. And backpacks and pant cuffs can harbor and release seeds, as well as dogs’ paws and fur. When I encountered Stinky Bob in a beautiful natural area last year in the Columbia Gorge; it had already spread over a slope as big as my back yard. No doubt someone unknowingly carried the seed there and the plant that resulted liked it there—a lot.

Tell others about the harm that invasives pose.

Join a local invasive plant eradication effort.

♦ If you see infestations in natural areas report them to the local soil and water conservation district or to an invasives hotline like Oregon’s www.oregoninvasiveshotline.org.

Better choices
Depending on your location and conditions, what are some possible native substitutes for the overzealous travelers, once they’re removed? In the Pacific Northwest, to replace English ivy (and cultivars), consider salal (Gaultheria shallon), kinnikinnick (Arctostaphylos uva-ursi), sword fern (Polystichum munitum), star-flowered false solomon’s seal (Maianthemum stellatum), inside-out flower (Vancouveria hexandra), or Cascade Oregon grape (Mahonia nervosa). Himalayan blackberry might be replaced with thimbleberry (Rubus parviflorus), salmonberry (Rubus spectabilis), or black-cap raspberry (Rubus leucodermis var. leucodermis). Arum could be succeeded by false solomon’s seal (Maiantheum racemosum) or vanilla leaf (Achyls triphylla). Vinca could be ousted by piggyback plant (Tolmiea menziesii), broadpetal strawberry (Frageria virginiana), or oxalis (Oxalis oregana or O. suksdorfii). And Stinky Bob might sublet his space to Western bleeding heart (Dicentra formosa), Oregon geranium (Geranium oreganum), or licorice fern (Polypodium glycyrrhiza). Always research plants’ needs and mature sizes before planting and choose those that would occur naturally in your area.

Herb robert

This huge clump of Geranium robertianum (Stinky Bob)—that’s pushed out native species—probably started with just one seed.

 

© 2017 Eileen M. Stark

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