Now, thanks to Two Bad Cats, this technology is available for those operating on a smaller scale. Two offset rows of flexible tines, spaced 1½" apart, span 18" across and will go around your established plants (and your drip tape!) without disturbing them, but will wreak havoc on barely germinated weeds. Handle is 56½" long with adjustable angle.

Like so many farm and garden activities, this tool requires well-timed use to be truly effective: it won't kill established weeds.