Well, late to the party as usual. Regardless of wild carrot, cow parsley, etc, it is SUPER hard to get rid of. Not as hard as wild garlic or onions, but still.
I'm surely not a Monsanto fan, and despise the GMO altered seeds. A different story. I won't buy "Roundup" because it's made by Monsanto. But I will and have bought a 40-50% glycophosphate not sold by Monsanto, and cautiously use it when necessary.
I'm too impatient to wait as long as it would take to stretch a sheet of black plastic over it. Not a patient person. I use most of my cardboard to start fires on brush piles (clearing back acreage of honeysuckle bush). I've tried using straight vinegar, which works well for some weeds, but not really tough ones like that one. I run around each spring with a small handheld shovel, and dig out wild onion/garlic from my mulched beds. So either dig them out, or bite the bullet and put some glycophosphate on it and be done.
---------- Post added at 02:44 PM ---------- Previous post was at 02:38 PM ----------
On the subject of plant sales... I used to own a couple of businesses prior to retirement five years back. The watergarden store... always help choose the best of the best available. The one that wasn't best will now be best. If I got to the point where they were pathetic specimens, i.e., hadn't grown up enough, etc., the price then dropped. Kind of like buying a seedling instead of a ready to bloom orchid. I was a terrible salesperson, and spent most of my time planting or doing other things.
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