1. Learn to Identify Buckthorn
There are two types of buckthorn common to Minnesota:
- Common Buckthorn (Rhamnus cathartica)
- Glossy Buckthorn (Frangula alnus)
Look for:
- Glossy green leaves that stay green well into fall
- Small black berries (toxic to humans, but spread by birds)
- Thorn-tipped twigs
- Dense thickets with little growing underneath
Identifying buckthorn correctly is the first step to effective removal.
2. Remove Buckthorn at the Right Time
Late fall and early spring are ideal for buckthorn removal. The ground is soft, and buckthorn is easier to spot when other plants have dropped their leaves. Removing it in winter can also prevent the spread of berries.
3. Start Small & Stay Consistent
Don’t try to clear your entire property in one weekend. Focus on a small area and work outwards. Removing mature buckthorn can expose soil and invite new growth, so regular follow-up is key.
4. Use the Right Tools
Buckthorn removal can be challenging without the right equipment. Pull smaller buckthorn plants out by the roots using tools like a weed wrench or root extractor. For larger trunks:
- Cut close to the ground
- Immediately treat the stump with an herbicide like glyphosate or triclopyr (following safety guidelines and local regulations)
Skipping chemical treatment usually leads to regrowth.
5. Dispose of Buckthorn Responsibly
Never leave piles of berries or branches on your land. Seeds can continue to spread and create more work for you. Instead:
- Burn debris (where permitted)
- Bag and trash berry-laden branches
- Chip and compost non-fruiting brush
6. Restore with Native Plants
Once buckthorn is removed, bare soil invites erosion and weeds. Replant with native grasses, shrubs, and trees to help stabilize the area and discourage buckthorn from returning.