Or...maybe use a grabber. Put cloth pads on the jaws and soak them with gly solution. Don't bend down just grab the weed and pull up --bottom to top. Coats the weed with gly.
Every 60 seconds spray the absorbent pads with more gly solution using a hand sprayer or 1 qt hand sprayer.
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And if you want to add a sharp sawtooth knife for those extra big weeds--why not? Or add a tree trim saw--if your weeds get big. You need a couple zip ties or some duct tape. Work out whatever works best so you do not have to bend down.
I use a "retired" steak knife on pokeweeks (a lot of no longer wanted family kitchen items find new lives in my shop). Slice it maybe 3" from the ground, and apply the 41% gly to the cut using a dropper, and it's
done.
My first thought was indeed a grabber with sponges. But the paint rollers appealed to me because they're more efficient at coating a surface than a sponge. Who paints walls with sponges (aside from for aesthetic effect)? Plus re-purposing a good metal grabber would cost more than the pair of super cheap roller frames. But I do like the way you think.
The part I'm most proud of isn't the roller idea, but is the "hinge" I came up with. A bolt was welded cross-wise to the fixed frame, I ran a nut onto it, and welded the moving frame to the nut.
I just bend over and pull em. Been working for 100’s of years
My wife tried pulling them for a few years. With nutsedge, pokeweed, greenbrier and violets (my big headaches), pulling doesn't kill the plant, because it leaves behind too much underground. That's how the nutsedge got so out of control. OTOH, I've had great luck keeping dandelions at bay by pulling.
You mentioned using a strong solution of gly.
Plant's, weed's need to uptake any and all solutions to work. Plants are always needing to uptake water. You are far better off using directed mix volume than just putting on a hot mix. Feed the plant what it want's. And slip in a Mickey.
I took this advice to heart, as it's a very good point. 41% works like magic when applied directly to the cambium, but isn't good for foliar application. Trying to strike a balance between dripping and surface uptake, I diluted the gly down to about 10% (the level recommended for greenbrier), with a lot of blue dye and some surfactant, plus xanthan gum to make it even less drippy. The blue food coloring gel made it easy to see that I was getting good coverage, and I treated hundreds of plants without needing to recharge the rollers. The pair of rollers fit perfectly in an old peanut butter jar, so I can store them without drying out.
I tried the paint roller that allows you to put paint into the handle. It worked to kill weeds out in between our garden rows. I felt thought that it was not being adequately spread throughout the area though. But the final result i was pleased and used very little herbicide.
Those rollers drip paint like crazy when I use them, and paint is engineered to not be all that drippy. Plus you can't roll onto something as springy as a single blade of grass. Which is why I decided on two rollers.
I haven't seen much color change in the nutsedge yet (it is always chlorotic looking), but I'll give it a few more days before passing judgement. It has seemed to work well on other stuff with no collateral damage so far.