Mary Meyer, Deb Brown, Mike Zins
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Mary Meyer, Deb Brown, Mike Zins. Table of Contents. Alkaline Soil Annuals 3 Feet or More Annual Vines That Grow Quickly Boulevard Gardens: Perennials Boulevard Gardens: Small Trees Broadleaf Evergreens for USDA Zone 4 Clay Soil Cold Tolerant Annuals Compacted Sites: Trees

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Table of Contents

  • Alkaline Soil

  • Annuals 3 Feet or More

  • Annual Vines That Grow Quickly

  • Boulevard Gardens: Perennials

  • Boulevard Gardens:

    Small Trees

  • Broadleaf Evergreens for USDA Zone 4

  • Clay Soil

  • Cold Tolerant Annuals

  • Compacted Sites: Trees

  • Crevice Plants

  • Deer Resistant Plants

  • Dry Soil: Annual Foliage Plants


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Table of Contents

  • Dry Soil: Shade or Under Trees

  • Dry Soil: Trees

  • Fragrant Annuals and Perennials

  • Fragrant Shrubs

  • Indoor Low Light

  • Knot Gardens

  • Lakeshore Native Plants

  • Long-Blooming Perennials

  • Rain Garden Plants


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Table of Contents

  • River Banks and Canoe Public Access Areas

  • Self-Seeding Perennials

  • Septic Mound Plants

  • Shade: Shrubs

  • Shade: Small Trees

  • Shade: Tall Perennials

  • Steep Slopes

  • Trees That Produce Minimal Litter

  • Under a Black Walnut Tree

  • References


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Trees for Alkaline Soil: honeylocust

  • Gleditsia triacanthos inermis

    honeylocust, 30-60’ thornless varieties are vest, provides filtered shade, rapid grower, tolerates many soil conditions

  • Buckeye, bur oak, hackberry, green ash, smokebush, and silver maple are also good trees for alkaline soils.


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Small Trees for Alkaline Soils

Ironwood: Ostrya virginiana 25-40’ Interesting hoplike fruits in fall and brown leaves add winter interest, native.

Smokebush, 6-15’

Chokecherry

Iowa State photo


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Hydrangea: Great Shrubs for Alkaline Soil

Hydrangea arborescens

hills of snow hydrangea 3-5’ tall; Spreads 3-5’;

mop-head blooms

Hydrangea paniculata panicle hydrangea 6-8’ Showy white to pinkish blooms in summer.

Endless Summer®

Hydrangea macrophylla 'Bailmer'

Requires acidic soil for blue color

pH 5.0-5.8; blooms on current season wood. pink in alkaline

soil pH 6-7.


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Lowering Soil pH for Blue Hydrangea Flowers

  • Before planting:1) Have your soil tested for initial pH level. Sending a sample to the University of Minnesota Soil Testing Laboratory soiltest.coafes.umn.edu

    2) If your soil pH is less than 5.5 the only amendment suggested before planting is to mix in sphagnum peat moss into your soil at the rate of 1 to 2 cubic ft per plant. (use a blend of 50% native soil to 50% sphagnum peat)3) If your soil pH is greater than 5.5, incorporate elemental sulfur into the top 6 to 8 inches of soil at the following rates to reduce your soil pH by 1 unit:For sandy soils - 1.0 lb per 100 square feet (about 2 cups)For loamy soils - 2.5 lb per 100 square feet (about 5 cups) For example, if the pH of your loamy soil is 6.0, incorporate 5 cups of elemental sulfur per 100 square feet (or ½ cup per 10 square feet). After mixing in the elemental sulfur, mix in 1 to 2 cubic feet of sphagnum peat moss per plant.


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Lowering Soil pH for Blue

Hydrangea Flowers

  • After planting:1) Periodically retest your soil pH. Do not add any acidifying amendments if your soil pH is 5.0 or less.2) Use ammonium sulfate as the nitrogen source at the rate of 1 lb (or 2 cups) per 100 square feet (or a little less than a ¼ cup per 10 square feet). Ammonium sulfate is the best nitrogen source to help maintain soil acidity. 3) If your soil pH is greater than 5.5, use aluminum sulfate to help lower your pH and supply available aluminum at the same time. Mix about 1 lb (2 cups) of aluminum sulfate per 5 gallons of water and then apply the solution around the drip line of the plant. Repeat the application on a monthly basis as long as your soil pH is greater than 5.0. Caution - over application of aluminum sulfate can be toxic even to hydrangea.

    Carl Rosen, Soil Scientist, U of Minnesota


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More Shrubs for Alkaline Soil

  • Lilac

  • Juniper

  • Barberry

  • Cotoneaster

  • Lilac

  • Viburnum


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Perennials for Alkaline Soil

yarrow

astilbe

clematis

sweet William

coneflower

daylily

coral bells

phlox

hosta

salvia


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Boulevard Gardens: Small Trees

  • Syringa reticulata Japanese tree lilac 15-25’ Long-lived and cold tolerant; scented ivory flowers are an early summer hallmark; interesting winter seed pods.


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Boulevard Gardens: Small Trees

  • Amelanchier laevis Alleghany serviceberry 15-25’ Minnesota native; large flowers; excellent red fall color; delicious edible purple fruits attract birds in summer.

  • Malus hybrids crabapple 15-25’ Tough and hardy in Minnesota; scab can be a conspicuous foliar disease, look for resistant varieties; many flower colors provide vivid displays; various shades of green foliage and winter interest with yellow or red fruit.


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Boulevard Gardens: Small Trees

  • Acer tataricum ssp. ginnala amur maple 20-30’ Lightly scented May flowers are followed by double serrated dark colored leaves with lighter undersides; excellent fall color; hardy, adaptable; grown as a free-form clump, standard, or a well-groomed hedge; self-seeds.

Minnesota Tree Care Advisor photos


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Perennials for clay soil

Russian sage

coneflower

feather reedgrass,‘Autumn Joy’ sedum

sedum

hosta and daylilies


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Trees for Compacted Sites

  • Acer rubrum red maple 50-70’ Round crown, transplants readily, ‘Northwood’ and ‘Red Sunset’ have nice fall foliage; MUST HAVE MOIST SOIL.


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Trees for Compacted Sites

  • Betula nigra

  • river birch

  • 40-70’

  • peeling cinnamon-brown bark, often multi-stemmed


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Trees for Compacted Sites

  • Celtis occidentalis hackberry

  • 40-60’ Vase-like habit, easily transplanted, very adaptable.

  • May be slow to establish

  • Native to MN


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Trees for Compacted Sites

  • Fraxinus nigra black ash 40-70’ Large black buds, ‘Fallgold’ recommended for fall color.

  • Fraxinus pennsylvanica green ash 40-60’ Fast growth, deep shade, broad rounded form, seedless varieties.now overplanted? tough urban tree, emerald ash borer


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Trees for Compacted Sites

  • Larix laricina larch, tamarack

  • 40-70’ native, deciduous conifer,

  • yellow fall color, few pests


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More Trees for

Compacted Sites

silver maple

cottonwood

cottonwood


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Deer Resistant Plants

chives and onion;

Allium spp.


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Deer dislike mugo pine, shown here on tortoise island at the Japanese garden,

Minnesota Landscape Arboretum


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ageratum Japanese garden,


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Shrubs for Shade Japanese garden,

azaleas

viburnum

barberry and boxwood


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Diervilla; bush honeysuckle Japanese garden,


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Under a Black Walnut Tree Japanese garden,


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Order from the shop.extension.umn.edu or Japanese garden,

Distribution Center: 1-800-876-8636


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