Some problems have no solution. All we can do is to share the pain and ease it a bit with laughter. For instance, whyizzit that:
...weeds are the plants that look best each spring among all the things I can no longer name? They absolutely give off vibes like 'of course I belong here'!
More about garlic mustard control
in What's Coming Up #39
...when you pull it up you see potting soil on its roots.
...there are several of them, equal in size and spaced to form a neat row or triangle.
...it has a ring of seedlings around it that germinated in the soil you disturbed when planting.
...there are seed leaves plus true leaves (so you know it's a seedling) and there are hundreds of them.
...it's growing where you don't want something to grow, such as within the eventual spread of a known desirable plant. No matter whether it's a volunteer seedling or sucker from another desirable plant, or a "true" weed, those little guys in spring turn into big competition that can warp and suppress your desirable plants.
If there are a lot of any given seedling, thin them out. What remains will be healthier, and more quickly recognizable as they grow.
Establish a "no man's land" around every known desirable plant -- no other plants there, just mulch. This, because so often we figure "I can let that stay awhile" in what looks like bare space in spring. Yet that ground rightfully belongs to your good plants which will expand as they grow.
How to know it's a seedling? Look for a big difference between the oldest two leaves and all newer leaves. Seedlings emerge with "seed leaves" and then begin to produce true leaves.
If you're thinning seedlings, stop being so tentative and worrying about whether they will make it. Watch how little effect it had on deliberately sown love in a mist seedlings (Nigella damescena) to have good sized tall rocket weeds and blackeyed Susan volunteers yanked out from their midst.
Tall rocket is a mustard family plant that's a "winter weed." Plants in that category germinate in fall and increase in size during every thaw so that they are not only well grown by early spring but flowered and gone to seed before many gardeners get out to tend a bed. Blackeyed Susan (Rudbeckia) is desirable elsewhere in this garden but here as a volunteer seedling, it's a weed.
Thin those seedlings! Leave at least a hand's breadth between seedlings. Even if half of them fail, those that are left will still fill that space in no time and be healthier and more attractive as a result.