Winter Horticulture Tips



  1. Cover strawberry plants with mulch so they don’t heave out of the ground this winter.


Using Old Garden Seed

Garden catalogs seem to come earlier each year.  Since new seed can be expensive, you may want to consider using seed bought in previous years.

We normally consider seed will remain viable for about 3 years under cool, dark, dry, conditions though there are exceptions. For example, members of the carrot family (carrots, parsnips and parsley) are short-lived and are usually good for only 1 to 2 years. Colorado State University has a publication giving more detailed information on the longevity of specific species at .

If you are unsure of viability and have plenty of seed, there is an easy method of determining how good your seed is. Place 10 seeds on a paper towel moistened with warm water and cover with a second moistened towel. Roll up the towels and place inside a plastic bag with enough holes for air exchange but not so many that the towels dry quickly. Place the bag in a warm place such as the top of a refrigerator. Remoisten towels with warm water as needed. After the first week, check for germination. Remove sprouted seed and check again after another week. Add these numbers together to determine the percent germination. (Ward Upham)


Mouse Damage to Fruit Trees/Plants

Be on the lookout for mouse tunnels around your fruit plants. Trunks and roots of apple trees are among the favorite meals for mice. There is probably no damage yet. But if we receive enough snow to cover winter food supplies, mice will begin to feed on the lower area of tree trunks and roots. This feeding may be severe enough to girdle tree trunks and kill the trees.

Mice like to hide in dead grass and weeds around the trees, especially close to the trunks. They will often tunnel near the soil surface and feed on the tree bark. You can check for mice by placing baited mouse traps in PVC or other pipe near your trees. Insert the traps far enough so that pets are unable to reach the trap. Check the stations about once a week and reset traps if necessary.

Mouse damage can be severe enough to kill trees that are old enough to bear fruit. Clear dead grass and weeds away from your trees and monitor for mice if you are using mulch around your fruit plants. (Ward Upham)


Controlling Volunteer Trees

Though trees are a vital part of our landscapes, there are situations where volunteer trees need to be controlled. This is often a case of the wrong plant in the wrong place. If the tree is still small and a desirable species, you may want to consider transplanting in the spring. If it is not, active control measures would be in order.

Most, but not all, trees resprout after cutting. Cutting those that don’t resprout is an effective control method. For example, eastern redcedar is a very common species that will not resprout after cutting. Those that do resprout include Siberian elm, hackberry, Osage orange (hedgeball), oak, ash, aspen, cottonwood, maple, sycamore, willow and many more. These trees will either need to be dug out or the cut stump treated with herbicide after cutting.

Note that when we say volunteer trees, we mean those that come from seed rather than suckers that originate from the roots of an existing tree. The recommendations given in the remainder of this article are designed to kill these volunteer trees. Using herbicides on suckers will damage and very possibly kill the original tree. Trees that commonly produce suckers include tree of heaven, honeylocust, black locust, hackberry, western soapberry, cottonwood, aspen, poplar, willow and boxelder.

It is also possible for larger trees of the same species to be root-grafted.   Even though root-grafted trees are not suckers, they do share materials between the individual root systems and therefore herbicides used to treat one tree can be passed to its neighbor. Let’s say we have a tree we want to control that is a volunteer and there are no other trees of the same species close enough to be root-grafted that we do not wish to harm. What do we do? If the tree is any size, you probably do not want to dig it out. That leaves using a herbicide on the cut stump. Basal treatments are also possible but that is beyond the scope of this article. First decide what herbicide to use.

Triclopyr and glyphosate are the herbicides most commonly available to homeowners. Triclopyr is found in many brush killers and glyphosate is found in Roundup as well as numerous other products. Read the label before purchasing to make sure that a cut stump treatment is listed. Most often the undiluted product or lightly diluted product is applied to the stump immediately after cutting. A paint brush is often used for the application though some people will dip their pruning shears in the products immediately before cutting. Regardless, it is important that the stump is treated immediately or at least within 5 minutes. Note that a paint brush with foam rather than bristles is less likely to drip.

Trees do not need to be actively growing to be controlled. Actually this time of year is a very good time to treat as long as applications are made when the temperature is above freezing. (Ward Upham)


Monitor Indoor Plant Temperatures

Now would be a good time to check the location of foliage houseplants to be sure the plants don’t get too cold this fall or winter. Plants next to windows or in entryways near outside doors are at the greatest risk. Plants sensitive to cold temperatures include Chinese evergreen

(Algaonema), flamingo flower (Anthurium), croton (Codiaeum), false aralia (Dizygotheca), and

ming and balfour aralia (Polyscias). Monitor and maintain temperatures above 65 degrees F for the false aralia and above 60 degrees for the rest of the list. Many other indoor plants prefer temperatures above 50 degrees. If needed, move plants away from the windows or door entrances to reduce cold temperature exposure. It may be necessary to move some plants from windowsills before shades or drapes are pulled, especially in the evening.   (Ward Upham)

Conservation Trees from the Kansas Forest Service

The Kansas Forest Service offers low-cost tree and shrub seedlings for use in conservation plantings. Plants are one to two years old and sizes vary from 8 to 18 inches, depending on species. Two types of seedlings are offered; bareroot and containerized.  Containerized provide a higher survival rate and quicker establishment.  Orders are accepted from December 1through May 1st, but order early to ensure receiving the items you want.

Orders are shipped beginning in mid-March.  Approved uses for these plants include windbreaks, wood lots, wildlife habitat, timber plantations and educational and riparian (streambank) plantings. They may not be used for landscape (ornamental) plantings or grown for resale.

All items are sold in units. Each single species unit consists of 25 plants. For example, a unit of Eastern red cedar has 25 trees per unit. Though a single species unit is most commonly purchased, four special bundles are also available including a quail bundle, pheasant bundle, eastern pollinator bundle and western pollinator bundle.

Tree planting accessories are also available including marking flags, root protective slurry, rabbit protective tubes, weed barrier fabric and tree tubes. If there have been problems with deer browsing on young trees, the tree tubes are a must.

For details and an order form, go to:     Order forms are also available from local K-State Research and Extension offices. (Ward Upham)

Contributors: Ward Upham, Extension Associate

Department of Horticulture and Natural Resources

1712 Claflin, 2021 Throckmorton

Manhattan, KS 66506

(785) 532-6173

For questions or further information, contact: [email protected] OR [email protected]





Please enter your comment!
Please enter your name here