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General

Erosion Solutions From Heavy Rain

March 29, 2022

Question: Can you slow water runoff at the top of a slope?

Natural Stone StepsMaster Gardener Carolyn Langdon advises you to build a small rain garden at the top of your slope. Add a small berm at the top of and/or mid-way down your slope. Put in a berm of logs, branches, soil and/or rocks to slow down the water running off and to allow time for the rain to absorb and for plant roots to establish. The idea is to place any material that will act to obstruct or slow down the path of water. Organic material has the additional benefit of providing texture and nutrients to your soil as it breaks down.

Clearing a shoreline or hillside of herbaceous plants, shrubs and trees can lead to erosion if not re-planted. Longer, steeper slopes, especially those without adequate vegetative cover are more susceptible to very high rates of erosion during heavy rains than shorter, less steep slopes.

Please remember that a rain garden is not the same as a water garden. There are 5 components to a rain garden:

1. Depression
2. Amended filter bed (see wood log trench below)
3. Berm on the low side
4. Rockery to slow water entering the garden if necessary
5. Plants tolerant of water and long periods of dryness (i.e. 2-3 days of standing water)

Woodlog Trench DiagramNatural Wood Log Berm

 

 

 

 

A rain garden is a low tech solution for a location that periodically gets inundated with water. For example some downspouts can’t handle the quantity of rain and the spill over can cause existing vegetation to die and erosion of soil. Hard surfaces channel water during torrential rain and spring snow melt events that cause erosion particularly on steep slopes. A rain garden and berming might be an affordable solution. A 5X10 foot rain garden 6 inches deep is equivalent to 11 rain barrels.

Dig your rain garden (12-18” deep) and fill with a combination of logs, branches, and wood chips at different stages of decomposition. Add native soil and locally composted organic matter. Plant. Remember good humic soil will store a lot of water. Other practises for extreme sites is to mulch deeply, contour the soil, plant native species adapted to the location and plant densely.

Select the Right Plants

In this situation plants that can withstand short periods of flooding and long periods of dryness are required. Xerioscaping plants i.e. those that tolerate drought won’t do well in a condition that includes extreme wet and extreme dry. Likewise plants that require constant moisture wil not do well.

Do favour native over non-native plants and do not plant fast growing invasive plants however tempting that might be to stabilize your slope.

The following native Ontario plants can tolerate moist and dry soil:

Aster (Aster spp.)
Bergamot, Wild (Monarda fistulosa)
Black-Eyed Susans (Rudbeckia hirta)
Blazing stars, Rough (Liatris aspera)
Evening Primrose (Oenothera biennis)
Bittersweet (Celastrus scandens)
Goldenrod (Solidago spp.)
Verbena (Verbena spp.)
Yarrow (Achillea millefolium)
Sweet gale or bog myrtle (Myrica gale L) Myricaceae (Wax-myrtle or bayberry Family)
Non invasive ornamental grasses, native sedges (they look like grasses and can tolerate some shade), and rushes. Hierochloe odorata or Sweetgrass
Marginal Woodfern (Dryopteris marginalis) can tolerates mid-summer drought if planted in the shade.
Butterfly Weed (Asclepias tuberosa) a Zone 3 Ontario Native that is heat and drought tolerant,
Liatris aspera or Blazing Star, another Ontario native,
Schizachyrium scoparium or Little Bluestem (Ontario native)
Highbush Cranberry (V. trilobum or V. opulus var. americanum). This native shrub likes to grow in open, wooded, somewhat poorly drained locations. In the ideal location, cranberry can become very wide, often three metres or more, and reach about the same height.
Low bush Cranberry or Squashberry (V. edule)
Nannyberry (Viburnum lentago) will grow almost anywhere including shade, but they take on their best form in full sunlight. In full sun their fall leaf colours will be a vibrant purple-red.
Common or Eastern Ninebark up to 3 m, spring flower cluster, berries

Credit Valley Conservation planted native plants in their rain garden. They chose the following plants because they were widely available at local nurseries: Red Osier Dogwood, New England Aster, Tall Meadow Rue, Black Eyed Susans, Canada Anemone.  Shade-tolerant native plants included: Common elderberry, Sensitive Fern and Heart leaved Aster.

A dense base of day lilies and irises will give you a fibrous root system. While they aren’t native they are often planted in a naturalized landscape.

To buy plants please try your local garden centre and check other sources listed in our list of suppliers and services here.

 

Article Sources

Credit Valley

Toronto Zoo

For additional plant selection please see Appendix C, List of Plants tolerating both wet and dry conditions. University of Guelph

Attracting Birds to Your Property

March 20, 2022

Courtesy Over to Me Studio
Janice Hardy, Retired MG

Bird in Tree

The two fastest growing hobbies in North America are gardening and bird watching. Imagine combining both hobbies in your very own back yard through designing and planting a garden to attract these very special friends. To entice a variety of birds to your yard or garden, provide them with an oasis of everything they need to survive: food and water, shelter from weather and predators and a nesting place and materials. If you design your garden from a bird’s perspective, they will come.

The Birds

Many birds require different food sources – from insects to seeds; from fruit to nectar. Warblers, for example eat primarily insects while finches like seeds such as those found at bird feeders. Nectar eating birds include hummingbirds and orioles. Some will forage for seeds directly from the ground while others look for insects under fallen leaves in woodland areas. Most birds will eat two or three different types of food, but usually have a preference for one. For the safety of birds, avoid the use of pesticides.

The Plan

The first step is to evaluate your space. Birds like to be in transition areas that provide food and water, shelter and nesting areas. If your property borders on a forest you are in a perfect area to develop a transition garden. However those on smaller properties require gardeners to visualize the transition area from a fence or wall where open space on the outer edge such as a lawn gradually gives way to mature shrubs closer to the fence or wall.
Transition the garden from lower perennials and annuals to shrubs and trees. Plan for a bird bath or water feature. Birds are especially attracted to moving water so consider suspending a plastic water bottle with a small hole in the end and allowing it to drip into the bird bath. Bird feeders around the garden, in the open but close to shelter, are another feature that should be considered, especially for winter sustenance.

The Plants

Fruit producing trees and shrubs will attract birds year round with fragrant spring blooms to fall and winter berries. They also provide an environment for those insects that attract warblers and orioles. In general, shrubs can grow quite tall (1.2-2.4m; 4-8 feet), although there are some dwarf varieties of Viburnums and Rugosa. While many deciduous shrubs are hardy only to Zone 5, there are some attractive native species for the gardens of Zone 4. Plants to consider are: Dogwoods, Viburnums, Rugosas, and Sumacs.

Birds are particularly fond of the native Red Twig Dogwood (Cornus albus) whose dense thickets of branches provide shelter and food for flycatchers, kingbirds, catbirds, waxwings, woodpeckers and vireos in the spring and summer and succulent berries in fall and winter. The red foliage in fall and red stems in winter contribute additional interest to the garden.

One of the great beauties of the autumn season is the Burning Bush (Euonymus alata ‘Compactus’). It’s not native but does well in our northern gardens. It’s distinguished by unusual corky “wings” which flare out along its branches as well as vibrant scarlet foliage and small red-orange fruit in the fall enticing cedar waxwings, cardinals, robins and brown thrashers. The plant grows 1.8-3 m (6-10 feet) high but there is a smaller variety, “Rudy Haag”, growing only 1-1.5 m (3-5 feet) high and wide. This is a shrub that is best left unpruned although it can be pruned if you have space issues. It is not fussy about soil requirements (except for excessive wet areas), will grow in sun to part shade and there are no significant pest problems.

Oregon Grape (Mahonia aquifloium) is a wonderful addition to your shrub base. A broad-leaf evergreen native to western regions, the fragrant yellow flowers in spring produce spectacular blue fruit that clings to the branches over winter. Both Blue and Grey Jays, waxwings, robins, redstarts and thrashers will forage for remaining fruit during fall migration and winter.

Shrubs should be planted at the back of the garden amidst evergreens such as junipers, spruces, and pines that are often preferred nesting sites for many birds. Conifers also offer warm shelter and protection from predators and food for house finches, crossbills and red-breasted nuthatches. If space is an issue consider a coniferous shrub such as Pfitzer Juniper (Juniperus x pfitzeriana). With a mature height of 6-8 feet this shrub delights robins, warblers and catbirds with superb nesting sites.

Deciduous trees such as a hardy hawthorn, with their exquisitely fragrant blooms in spring are a magnet for migrating warblers and in fall, cedar waxwings and robins eat the fruit. Be sure to check the zone as many Hawthorn cultivars are not hardy to Zone 4.

Whether grown on a fence or climbing a tree or trellis, Vines will add a dimension of height to your garden as well as provide shelter and nesting areas to our feathered friends. Vines that flower at different times of the year or have brightly coloured foliage in the fall will add interest in all seasons. Honeysuckle (Lonicera x brownii ‘Dropmore’ Scarlet) are a favourite of hummingbirds and robins will nest in a thick clump of Clematis. Indigo Buntings prefer to nest within a vine tangle such as Boston Ivy (Parthenocissus tricuspidata). The native Virginia Creeper (Parthenocissus quinquefolia) provides winter food and spectacular colour beckoning thrushes, woodpeckers, vireos and warblers.

The final section of the transition garden that birds love includes herbaceous perennials, grasses and annuals. They provide seeds for ground feeders such as sparrows and dark-eyed juncos as well as nesting materials for many birds. Some plants, such as Bee Balm, Bleeding Heart and Columbine will attract the nectar eaters – hummingbirds and orioles.

Yellow Finches on Bachelor ButtonsGrasses furnish sufficient shelter for finches and sparrows that prefer foraging in lower branches and also attract insects for warblers. Grasses also provide excellent nesting material and the tall grasses such as Karl Foerster(Calamagrostis x acutiflora ‘Karl Foerster’) lend themselves to planting near the back of the border with shorter grasses such as Blue Oat Grass (Helictotrichon sempervirens) as accents closer to the front of the garden.

Plant progressively from taller to lower species that bloom at a variety of times over the season to add more interest to the garden. Any perennial that produces seeds will provide food for cardinals, finches, indigo buntings, chipping sparrows, song sparrows and goldfinches. Some excellent Zone 4 perennials or annuals include spring flowering plants – Columbine, Bleeding Heart; early summer flowering plants – Coreopsis, Cosmos, Bee Balm, Daylily; mid-August to September – Purple Coneflower, Black-Eyed Susan and other Rudbeckia, Daisy, Phlox; Autumn flowering plants – Sedum, Asters; annuals for late spring to frost – Impatiens, Petunias and Zinnias.

In summary, some key points to remember:

Birds require food and water, shelter and nesting areas. A few bird friendly seed-producing perennials and a bird bath are good starters, especially for common back yard birds (Finches, sparrows, woodpeckers, chickadees and nuthatches). Avoid the use of pesticides; Transition the garden from open areas and low growing plants such as annuals and some perennials to larger and taller perennials such as Black-Eyed Susan and Coneflower to even larger shrubs and trees; Choose plants that bloom at different times of year: Examples are Columbine and Bleeding Heart for spring, Bee Balm and Daisy for summer and Asters and Sedum for fall; Add winter interest and food sources by planting evergreen shrubs and trees, plants with interesting bark such as dogwood and burning bush and vines like Virginia Creeper; You don’t need to design a brand new garden – just add some of the above featured plants and a bird bath and you are well on your way to having birds in the garden.

Resources
Bezener, Andy, Birds of Ontario, Lone Pine Publishing, 2000
Dolezal, Robert J.,Birds in Your Back Yard, Readers Digest Association, 2005
Lanicci, Rachael, Garden Secrets for Attracting BIrds, Planet Friendly Publishing, 2010

Cornell Lab of Ornithology “Bird Notes”.
Fletcher Wildlife Garden, Ottawa, Ontario
Landscape Ontario
Suite 101: On line magazine

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