Re-vegetation

Species selected for re-vegetating disturbed sites and common tansy infestations should be appropriate for management objectives, adapted to site conditions, and competitive with the weed. Management objectives will determine if introduced or native species are seeded and the combination of species in the seed mix. The environmental conditions of the site including precipitation, soil texture and depth, slope and aspect, will affect species establishment. Refer to Montana Plant Materials Technical Note 46, ‘Seeding Rates and Recommended Cultivars,’ and Extension Bulletin EB19 ‘Dryland Pasture Species for Montana and Wyoming’ for seeding rate guidance and re-vegetation species selection. State, Area, and Field Resource Specialists can help determine the most appropriate, site-specific species mix and timing of seeding.

In most cases, herbicidal suppression of common tansy is needed for re-vegetation of infested areas. The herbicides listed in Table 1 will control common tansy and reduce competition during the establishment period with little or no injury to emerging grass seedlings. This is especially important for species that are slow to establish like many of the native grasses. However, where herbicides have been applied, chemical carryover should be assessed prior to planting permanent vegetation particularly where shrubs and forbs are being used. Common tansy is often found in all the hydrologic zones of stream banks and riparian areas. Conservation practices that address riparian restoration, such as Channel Bank Vegetation (Code 322), may be needed after common tansy control to maintain hydrologic cycles and prevent soil and water resource concerns such as erosion and sedimentation.

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Last Modified: 02/27/2008