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04-22-24-WS
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GREATjU <br />RIVERlRIPW <br />GREENING <br />Japanese Barberry (Berberis thunbergii) <br />Description <br />Barberry is a small spiny shrub, growing 3-5 feet tall. It may be rather spindly in habit when growing in <br />deep shade, or more compact when growing in part -shade and sun. The small rounded leaves taper to <br />the stem and occur in small clusters associated with one of the spines along the stems. Insignificant <br />yellow flowers open in May. They occur singly or in groups of 2-4, hanging beneath the branches. Fruit <br />are bright red oblong berries which may persist into winter if they aren't eaten first by birds which <br />disperse the seeds. Barberry has the ability to spread by layering, when its lower branches root into the <br />ground. <br />Japanese barberry, along with many of its horticultural cultivars are sold as ornamentals in Minnesota <br />and other states. Japanese barberry is currently a Minnesota Department of Agriculture Specially <br />Regulated Plant, which means that the species type and several cultivars of Berberis thunbergii are being <br />phased out of the nursery trade and may not be legally sold in the state after December 31, 2017. <br />Mechanical <br />Small populations of Individual plants can be rogued out with a shovel, mattock, or weed wrench. <br />Because the lower stems may have rooted down, care must be taken to up -root all stems for complete <br />control. Forestry mowing in winter may control barberry if the shredded stems are exposed to <br />dessicating conditions, however, follow-up foliar treatment is often necessary. Cut stems must be <br />treated with herbicide or the shrub will resprout from the base. <br />Chemical <br />Cut -stump treatment with glyphosate or triclopyr is effective at controlling barberry. The herbicide <br />should be applied to the stump without delay for optimal effectiveness. Barberry may be difficult to <br />control due to its ability to layer. If all of the rooted stems are not cut and treated, barberry may survive <br />cut stump treatment. Foliar herbicide treatments can also be effective, but care needs to be taken to <br />avoid collateral damage to native species. Timing foliar treatments using glyphosate or triclopyr while <br />native species are dormant is necessary to minimize damage to desirable species. <br />Long-term Management <br />Barberry are prolific seed producers, so monitoring and follow-up treatment will be needed to obtain <br />control. <br />Japanese Barberry <br />Dec - <br />April <br />May <br />June July Aug Sept Oct Nov <br />Mar <br />Burn <br />Foliar Herbicide <br />Basal Bark Herbicide <br />Cut Stem Herbicide <br />Flowering <br />
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