I've got a ton of Japanese knotweed growing around my area. I've heard it's really nutrient-rich, but I also know it's super invasive. I'm thinking about using knotweed along with other foraged plants like dandelion to create a liquid fertilizer. My plan is to mix it in a bucket with water and let it sit for about three to four weeks. After that, I would strain out the solids. But I'm worried—will I still risk the knotweed taking root again?
3 Answers
You might end up with a seriously foul-smelling concoction after three or four weeks! If the knotweed has gone to seed, you're really increasing your risk of it sprouting. Maybe reconsider?
Honestly, I wouldn't even consider using knotweed for anything. It's been a nightmare for me trying to get rid of it for years. The risk just isn't worth it!
Using knotweed as fertilizer is just asking for trouble. That stuff is incredibly resilient, thriving in both dry and wet conditions, especially in wetlands. It can easily overtake your garden!

Yeah, that's my concern! I definitely don’t want it spreading even more.