December 7, 2011
Upcoming statewide/multi-state horticulture conferences of possible interest to HHPN readers are listed below. Additional information on each program is available from the listed contacts.
Fulkerson Conference Center, Missouri Western State University, St. Joseph, Missouri
Program Information: www.greatplainsgrowers.org
The root systems of perennial plants are much less cold tolerant that the above ground portions of the plants. For the most species we can grow in Iowa, root injury can begin occur when the soil temperature drops below 18 to 15 degrees F. Fortunately, the soil has a tremendous buffering capacity and the temperature in the root zone seldom drops this low, but it can when there is a shortage of soil moisture going into the winter.
Holly, mistletoe and poinsettias of many colors are favorites for holiday decorating.
The following are highlights and updates about samples and questions recently received in the Plant & Insect Diagnostic Clinic: