See it in action,
@bobm .
It gets beneath the surface and cuts the roots away from below the crown. Really effective on crab grass, and if you've ever tried to hand pull a patch of that in dry red clay, you know what a feat that is. I wiped out a lot of grasses, wild morning glories and red root pigweed in the garden. I will have to see if the pigweed comes back from its taproot as it often does. But it won't take any effort to wipe it out again.
The tool lies flush with the soil and you move it back and forth, cutting both ways. It takes less energy than a chop hoe. The motion is much like vacuuming or wiping clean a chalkboard. The soil surface is only disturbed shallowly.
One half of my overgrown raised bed done... Big, tough weeds! This would have taken me 1-2 hours to hand pull and I would have been covered in sweat and dirt.
This bed was done yesterday, in the same shape as the one above. Everything is good and dead (except that one by the fence I missed).
Part of the garden I worked on yesterday. The 6" head gets in and around the sunflowers closely, but doesn't dig deep enough to hurt their roots.
Nasty patch of crabgrass...
30 seconds later it is gone!
I have some rocks in my garden, mostly pebbles and sandstone. The tool is very well made, in the USA no less, top notch materials. After using it quite a bit the past 2 days, it is still sharper than any of my kitchen knives. I sharpen my garden tools on the bench grinder or angle grinder if they need it. I've used it on mulch, sod, loamy amended soil and packed clay. Worked great on it all. I am not sore either, like I would have been from hoeing all that. Happy, happy, happy!