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Gardening in Iowa Zones - Iowa State University Extension and

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Gardening in Iowa Zones - Iowa State University Extension and Powered By Docstoc
					Gardening in Iowa Zones
Zone maps are a gardener’s best tool for selecting plants   The USDA Plant Hardiness Zone Map divides the country
that will do well in local gardens.                         into 13 zones based on the average annual minimum
                                                            temperatures. Zone 1 is the coldest area where minimum
2012 USDA Plant Hardiness Zone Map                                                                   .
                                                            temperatures can go down to minus 60°F At the other
Most gardeners are familiar with the United States          extreme, Zone 13 is the warmest zone in tropical
Department of Agriculture’s Plant Hardiness Zone Map                                                    .
                                                            locations where lows don’t drop below 60°F The zones
as a standard guide to a plant’s cold tolerance. It has     are divided by 10-degree increments. According to the
been an important tool when selecting trees, shrubs,        2012 version of the map, most of Iowa is in Zone 5. Small
and perennials for the landscape for over 40 years. The     areas in northwest and northeast Iowa are in Zone 4.
data on which the 2012 map is based was gathered from
1976 to 2005. Most American reference books, nursery        Cold isn’t the only factor that determines whether plants
catalogs, and gardening magazines describe a plant’s        will survive and thrive in an area. Heat also has an effect
ability to survive cold temperatures using USDA plant       on plants. The effects of heat damage are less obvious
hardiness zones.                                            than the damage caused by extreme cold, which will
                                                            either kill a plant instantly or slowly over the winter.




                                                                                            RG 215 Revised January 2013
AHS Plant Heat Zone Map                                                                                                                                                                        Using the Zone Maps
In 1997, the American Horticulture Society (AHS)                                                                                                                                               The USDA Plant Hardiness Zone Map and AHS Plant
developed a new map, called the AHS Plant Heat Zone                                                                                                                                            Heat Zone Map are guides to help gardeners select plants
Map, to help gardeners choose plants suited to summer                                                                                                                                          suitable for their location. However, the maps are only
temperatures in their region.                                                                                                                                                                  guides. They are based on the average annual minimum
AHS Heat Zones (1997)                                                                                                                                                                          temperature and average number of days of 86°F or
                                                                                                                                                                                               higher. Longtime Iowa residents realize the weather in
This zone map is used to select vegetables, annuals,                                                                                                                                           this state is rarely normal or average. Periodically, these
aquatic plants, and turf grass species as well as                                                                                                                                              averages will be exceeded, sometimes by a wide margin.
perennials. It divides the United States into 12 zones                                                                                                                                         Plants may be damaged or destroyed during extreme
based on the average number of days in the year that                                                                                                                                           weather events.
                                               .
daily high temperatures reach or exceed 86°F This
temperature was chosen because it is the point at which                                                                                                                                        For example, a tree or shrub hardy in USDA Hardiness
plants begin to suffer physiological damage from heat.                                                                                                                                         Zone 5a (average annual minimum temperature of -15
                                                                                                                                                                                               to -20°F) may grow well for several years as long as
The zones range from Zone 1 (less than one heat day)                                                                                                                                           winter temperatures are average or warmer than normal.
to Zone 12 (more than 210 heat days). Iowa occupies                                                                                                                                            However, a bitterly cold winter (when temperatures drop
parts of Zones 4 (northeast part of the state) through 7                                                                                                                                       to -25 to -30°F) may result in serious plant damage or
(extreme southwest part of the state).                                                                                                                                                         possibly death.

                                                                                                                                                                                               For more information
   LYON         OSCEOLA               DICKIN
                                      SON
                                                       EMMET         KOSSUTH         WINNE
                                                                                     BAGO
                                                                                                     WORTH         MITCHELL HOWARD                 WINNE
                                                                                                                                                   SHIEK
                                                                                                                                                                  ALLA
                                                                                                                                                                                               Horticultural information on selection, planting, cultural
    SIOUX          O BRIEN            CLAY        PALO ALTO                         HANCOCK            CERRO
                                                                                                       GORDO        FLOYD       CHICKASAW
                                                                                                                                                   FAYETTE CLAYTON
                                                                                                                                                                  MAKEE
                                                                                                                                                                                               practices, and environmental quality is available from
  PLYMOUTH     CHEROKEE             BUENA
                                    VISTA
                                                      POCAH
                                                      ONTAS
                                                                      HUMB
                                                                      OLDT
                                                                                     WRIGHT      FRANKLIN           BUTLER           BREMER                                                    your local Iowa State University Extension office and
     WOODBURY              IDA           SAC      CALHOUN
                                                                     WEBSTER
                                                                                    HAMILTON         HARDIN         GRUNDY
                                                                                                                                 BLACK
                                                                                                                                 HAWK
                                                                                                                                                         BUCH DELAWARE DUBUQUE
                                                                                                                                                         ANAN
                                                                                                                                                                                               from these websites.
               LYON              OSCEOLA       DICKIN        EMMET    KOSSUTH       WINNE     WORTH      MITCHELL HOWARD         WINNE
                                               SON                                  BAGO                                         SHIEK
                                                                                                                                           ALLA


                                                                                                                                                                                               https://store.extension.iastate.edu/
                                                                                                                              TAMA         MAKEE
                                                                                                                                           BENTON           LINN          JONES      JACKSON
                   SIOUX         O BRIEN        CLAY     PALO ALTO               HANCOCK       CERRO
                                                                                               GORDO      FLOYD     CHICKASAW
          MONONA           CRAWFORD            CARROLL GREENE                   BOONE         STORY        MARSHALL             FAYETTE CLAYTON


              PLYMOUTH


            HARRISON
                                 CHEROKEE


                            SHELBY
                                               BUENA
                                               VISTA

                                               AUDU
                                                          POCAH
                                                          ONTAS

                                                          GUTHRIEWEBSTER
                                                                    DALLAS
                                                                         HUMB
                                                                         OLDT
                                                                                 WRIGHT      FRANKLIN


                                                                                             POLK
                                                                                                          BUTLER     BREMER


                                                                                                           JASPERBLACK         POWE         IOWA      JOHNSON
                                                                                                                                                                          CEDAR
                                                                                                                                                                                     CLINTON
                                                                                                                                                                                               www.yardandgarden.extension.iastate.edu
                                                                                                                                                                                               www.reimangardens.iastate.edu
                                                                                                                                  BUCH    DELAWARE DUBUQUE
                    WOODBURY          IDA      BON
                                                SAC      CALHOUN                 HAMILTON     HARDIN      GRUNDY     HAWK      SHIEK
                                                                                                                                  ANAN                                               SCOTT
                                                                                                                                                                         MUSCATINE
                                                                                                                  TAMA      BENTON       LINN      JONES       JACKSON
              POTTAWATTAMIE
                   MONONA  CRAWFORD CARROLL GREENE MADISON
                                CASS     ADAIR       BOONE                                  WARREN MARION
                                                                                            STORY MARSHALL               MAHASKA KEOKUK              WASHING
                                                                                                                                                     TON
                                                                                                                                                               CLINTON
                                                                                                                                                   CEDAR             LOUISA
                           HARRISON      SHELBY        AUDU    GUTHRIE     DALLAS      POLK       JASPER           POWE       IOWA     JOHNSON
                                                      BON                                                          SHIEK
                   MILLS          MONT                ADAMS          UNION       CLARKE           LUCAS           MONROE                          SCOTT
                                                                                                                                WAPELLO JEFFERSON HENRY
                                  GOMERY                                                                                                           MUSCATINE             DES
                             POTTAWATTAMIE            CASS      ADAIR      MADISON    WARREN    MARION      MAHASKA KEOKUK           WASHING                             MOINES

                                                                                                                                                                                               Reviewed by Richard Jauron, extension horticulturist.
                                                                                                                                     TON
                FREMONT             PAGE          TAYLOR             RING        DECATUR         WAYNE         APPANOOSE DAVIS                  VAN BUREN
                                                                                                                                                LOUISA
                                                                     GOLD                                                                                      LEE
                                 MILLS      MONT          ADAMS       UNION     CLARKE       LUCAS      MONROE     WAPELLO JEFFERSON HENRY

                                                                                                                                                                                               Originally prepared by Linda Naeve, former extension
                                            GOMERY                                                                                                DES
                                                                                                                                                  MOINES
                                 FREMONT       PAGE      TAYLOR       RING      DECATUR      WAYNE      APPANOOSE DAVIS     VAN BUREN
                                                                      GOLD                                                               LEE



               Numberof days per year over 86ºF F
                      of days per year over 86ϒ                                                                                                                                                coordinator horticulturist.
               Number of days per year over 86ϒF
                 Number
                           4: >14 to
                     Zone 4: >14 to 30 30
                      Zone                          Zone 4: >14 to 30                                                                                                                          …and justice for all

                                                    Zone 5:>30 to 45 45
                                                    Zone >30 to
                                                   Zone 5:5: >30 to 45                                                                                                                         The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and
                                                                                                                                                                                               activities on the basis of race, color, national origin, age, disability, and where applicable,
                                                    Zone 6: >45 to
                                                    Zone 6: >45 to to 60
                                                   Zone 6: >45 60 60
                                                                                                                                                                                               sex, marital status, familial status, parental status, religion, sexual orientation, genetic infor-
                                                                                                                                                                                               mation, political beliefs, reprisal, or because all or part of an individual’s income is derived
                                                    Zone 7: >60 90
                                                    Zone 7: >60 to to 90                                                                                                                       from any public assistance program. (Not all prohibited bases apply to all programs.) Persons
                                                   Zone 7: >60 to 90                                                                                                                           with disabilities who require alternative means for communication of program information
                                                                                                                                                                                               (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at 202-720-2600
                                                                                                                                                                                               (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil
                                                                                                                                                                                               Rights, 1400 Independence Avenue SW, Washington, DC 20250-9410, or call 800-795-3272
                                                                                                                                                                                               (voice) or 202-720-6382 (TDD). USDA is an equal opportunity provider and employer.

                                                                                                                                                                                               Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in
                                                                                                                                                                                               cooperation with the U.S. Department of Agriculture. Cathann A. Kress, director, Cooperative
                                                                                                                                                                                               Extension Service, Iowa State University of Science and Technology, Ames, Iowa.

				
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