Transcript No Slide Title

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
Crevice Plants
Deer Resistant Plants
Dry Soil: Annual Foliage
Plants
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
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
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.
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
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 68’ 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.
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.
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
More Shrubs for Alkaline Soil
 Lilac
 Juniper
 Barberry
 Cotoneaster
 Lilac
 Viburnum
Perennials for Alkaline Soil
yarrow
astilbe
clematis
sweet William
coneflower
daylily
coral bells
phlox
hosta
salvia
Boulevard Gardens: Small Trees
 Syringa reticulata Japanese
tree lilac 15-25’ Longlived and cold tolerant;
scented ivory flowers are
an early summer
hallmark; interesting
winter seed pods.
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.
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
Perennials for clay soil
Russian sage
coneflower
feather reedgrass,
‘Autumn Joy’ sedum
sedum
hosta and daylilies
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.
Trees for Compacted Sites




Betula nigra
river birch
40-70’
peeling cinnamonbrown bark, often
multi-stemmed
Trees for Compacted Sites
 Celtis occidentalis
hackberry
 40-60’ Vase-like habit,
easily transplanted, very
adaptable.
 May be slow to establish
 Native to MN
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
Trees for Compacted Sites
 Larix laricina
larch, tamarack
 40-70’ native,
deciduous
conifer,
 yellow fall color,
few pests
More Trees for
Compacted Sites
silver maple
cottonwood
cottonwood
Deer Resistant
Plants
chives and onion;
Allium spp.
Deer dislike mugo pine, shown here on
tortoise island at the Japanese garden,
Minnesota Landscape Arboretum
ageratum
Shrubs for Shade
azaleas
viburnum
barberry and boxwood
Diervilla; bush honeysuckle
Under a Black Walnut Tree
Order from the shop.extension.umn.edu or
Distribution Center: 1-800-876-8636