April 22, 2009
Spring Division of Herbaceous Perennials
Herbaceous perennials are commonly divided to control size, retain vigor, encourage more blooms and increase the number of a particular perennial in the landscape. Vigorous perennials may not be model citizens in the planting area and grow so rapidly that they choke out neighboring plants in the flower bed. Other perennials decline in vigor and do not bloom as heavily if not divided.
The best time to divide perennials varies with the different plant species. Below is a list of common perennials that should be divided in spring.
The discovery of the emerald ash borer across the Mississippi River from Iowa will mean increased attention on this invasive pest in Iowa. ISU Extension will continue to provide updates on the distribution and management options for this new pest as information becomes available from the partnering agencies (The Iowa Department of Agriculture and Land Stewardship, Iowa Department of Natural Resources, USDA-APHIS and USDA Forest Service).
In early April the emerald ash borer was discovered near Victory, WI just across the Mississippi River from the Iowa-Minnesota border. [news release]
The emerald ash borer (EAB) is a small, invasive beetle, whose larvae tunnel under the bark, killing ash trees. With the discovery of an EAB infestation within sight of Iowa there is a great deal of concern about what this means for ash trees in Iowa.
Below is a brief background on the emerald ash borer. For more information visit the national emerald ash borer website.