Seasonal guide to beating invasive plants in Minnesota

By Scout Nelson

Minnesota is witnessing an early onset of spring this year, making it the perfect time to start tackling invasive plant species. These unwelcome guests have different growth cycles—woody, herbaceous annual, biennial, or perennial—and each type requires a specific approach to manage effectively.

Spring: It's time to get ahead of garlic mustard by pulling it out before it has a chance to spread its seeds. Also, consider using prescribed fires to clear out invasives while sparing the native prairie species that haven't yet emerged.

Summer: This season is key for getting a handle on species like spotted knapweed, which are in full growth mode but haven't gone to seed. It's the perfect time for intervention.

Fall: As plants prepare for winter, they're moving energy into their roots, making this the ideal time to apply herbicides to biennials and perennials. This strategy ensures the chemicals are transported directly to where they're most effective.

Winter: Though many plants are dormant, it's an excellent opportunity to cut back and treat woody vines like roundleaf bittersweet, which are still accessible.

Effective management isn't just about timing. Knowing the right method for each plant's lifecycle stage, avoiding pollinators by spraying early in the morning or outside of bloom times, and having the proper materials and equipment are all crucial to success.

Minnesota's battle against invasive species is a year-round endeavor. With the right knowledge and timing, we can protect our native ecosystems and enjoy a healthier, more vibrant natural landscape.

Photo Credit -istock-georgeclerk