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Drought in Our Minnesota Landscapes

How to keep our landscapes green during times of drought.
by

Polly Augustson

on 13 March 2013

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Transcript of Drought in Our Minnesota Landscapes

DROUGHT DROUGHT IN MINNESOTA LANDSCAPES WHAT IS HAPPENING IN OUR FORESTS? IS IT DRY? OR IS IT DROUGHT? QUESTIONS SHRUB Apple
Fir, concolor & white
Ginkgo
Hackberry
Japanese Tree Lilac
Sugar maple
Bur oak
Pine TREE DROUGHT TOLERANT
TREE AND SHRUB SELECTIONS
Organic mulch is best

3 to4 inches deep, away from trunk
of the tree, and to drip line HOW MUCH MULCH DO I NEED? Conserves soil moisture by reducing evaporation

shades the soil and reduces soil temperature which helps to conserve soil moisture

Consider using organic mulches (bark, wood chips, leaves, cocoa bean hulls) that once decayed, benefit the soil in comparison to rocks

Apply a fresh layer of mulch to areas where it is thin and soil is becoming exposed BENEFITS OF MULCH

Watering & methods

Mulching

Drought tolerant selections* TREE & SHRUBS Most annual and perennial gardens need 1 inch or more of water per week.

Rain fall

In ground & above ground sprinklers

Soaker hose & sprinkler hoses

Drip irrigation

*Rain barrel WATERING One cubic yard of mulch will cover a 324 sq ft area with 1" of mulch.
2 to 4 inches are recommended to inhibit weed growth

Figure out the square footage of your bed (width x length for square or rectangular shapes)

Multiply your square footage by the depth desired (in inches)

Divide by 324. This will tell you how many cubic yards you will need.

Example calculation for a rectangular area 6' x 90' to be covered with 2" of mulch:
6' x 90' = 540 sq ft
540' x 2 = 1080 sq ft.
1080 ÷ 324 = 3-1/2 cubic yards


Or use an online calculator such as Lowe’s
http://www.lowes.com/cd_Mulch+Calculator_693827138 HOW MUCH MULCH DO I NEED? HOW MULCH DECREASES
WATER RUN OFF Conserves soil moisture by reducing evaporation

shades the soil and reduces soil temperature which helps to conserve soil moisture

Consider using organic mulches (bark, wood chips, leaves, cocoa bean hulls) that once decayed, benefit the soil in comparison to rocks

Apply a fresh layer of mulch to areas where it is thin and soil is becoming exposed. BENEFITS OF MULCH Organic Mulches:

Composted animal manure - horse, cow, sheep, chicken

Compost from yard waste (excluding weeds & diseased plant material)

Grass clippings Shredded leaves

Peat Straw & hay Pine needles

Wood products - chips, bark, shredded, TYPES OF MULCH ANNUAL & PERENNIAL

Watering & Methods

Mulch

Fertilizing

Drought tolerant selections* GARDENS
Fine-leaved fescue

Perennial rye grass

‘Common’ Kentucky
Bluegrass DROUGHT TOLERANT
LAWN GRASS SELECTIONS
Rain gauge: manual or digital

Place several shallow, open, wide mouth cans around sprinkler.
Turn on sprinkler & water for 15 minutes.
Collect water from cans and pour into one can (same width as collection cans) and measure with ruler.
Divide total by the number of cans.
This number should give you total for 15 minutes. Use this number to determine how long to water.
TIPS
1” of water on sandy soil = 12 inch depth
1” of water on loamy soil = 6-8 inch depth
1” of water on clay soil = 4-5 inch depth HOW TO MEASURE
RAINFALL & IRRIGATION Lawns need 1 inch of water per week and sometimes more, depending on soil type.

Rain fall

In ground sprinklers

Above ground sprinklers WATERING AND METHODS

Aeration and de-thatching in spring if compaction exists.

Fertilizing once a year around Halloween.
Use with care during drought as it may
cause damage to root systems. AERATION-DETHATCHING
FERTILIZING Lawns

Gardens
Annual
Perennial

Trees & Shrubs OUTLINE An extended period of months or years when a region notes a deficiency in its water supply from:
*surface & underground water

Consistent below average precipitation.

Substantial impact on;
the ecosystem
agriculture
economy*

*Although droughts can persist for several years, even a short, intense drought can cause significant damage and harm the local economy. WHAT IS DROUGHT? DROUGHT MONITOR MARCH 2013
Polly Augustson
Wright County Master Gardener
Minnesota Tree Care Adviser

Janet McDaniel,
Minnesota Tree Care Adviser DROUGHT IN OUR MINNESOTA LANDSCAPE Water-Wise Gardening/ MN EXT.
Minnesota Climatology Working Group
The Weather Channel
Watering 101, Iowa State University Extension
USGS
YouTube
Aspen Center for Environmental Studies University of Minnesota Extension
University Forest Extension Resources
Minnesota Drought Watch
SULIS
University of Minnesota Extension News
Department of Natural
Resources
My Minnesota Woods Top 8 to 12 inches of soil must be moist but not saturated,

Newly planted trees: twice weekly

Young established trees: once weekly

Established trees & shrubs: moisture should be retained in the critical root zone for the life of the tree

Over watering will kill trees!

Moisture needs to be available until the ground freezes

METHODS
Hoses - Soaker hoses - sprinkler hoses
drip watering tapes - watering bags WATERING AND METHODS PERENNIAL Alyssum
Geranium
Lantana
Marigold
Pansy
Petunia
Zinnia ANNUAL DROUGHT TOLERANT
FLOWER GARDEN SELECTIONS

Use with care during times of drought.

Fertilizing during times of drought can cause damage to root systems. FERTILIZING
1930 – 1940; from New York, Pennsylvania and across the Great Plain to the California coast. The Great DUST Bowl.

1955 – 1956; Central and Southern United States.

1988 – 1989; Central and Eastern United States.

2011 – 2012 Central United States.

Watering
Aeration
Dethatching
Fertilizing
Drought tolerant selections* LAWNS NORMAL ANNUAL
MINNESOTA PRECIPITATION OPTION 1:
LET YOUR LAWN GO DORMANT Bush honeysuckle
Cotoneaster
Dogwood
Lilac
Shrub rose
Serviceberry
Viburnum
Sumac Artemisia
Black-eyed susan
Coneflower
Daylily
Hen & chicks
Iris
Yarrow WATERING TREES & SHRUBS WRIGHT COUNTY SOIL AND WATER You may think that every drop of rain that falls from the sky or each glass of water that you drink is brand new, but in fact it has always been here and is a constant part of the 'WATER CYCLE' of our planet! RESOURCE CREDITS World Water Day In 2010 the United Nations declared 2013
"International Year of Water Cooperation". http://www.unwater.org/watercooperation2013/ 'Water, water everywhere, only if we share' Recent Droughts that have affected Minnesota March 22 2013 Plant Native Prairie OPTION 2:
CONVERT LAWN TO GARDENS,
PLANT TREES & SHRUBS How do the weather services collect rainfall amounts? http://www.cocorahs.org/ Community Collaborative Rain, Hail & Snow Network Dan Nadeau Fertilizing
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