The product can be backed by actual tests of its ability to only hurt weeds X,Y,Z and not desirable plants P,D,Q found in the same garden or field setting. Make the test harder than an actual lot would be.

If the robot can smartly apply fertilizer to designated plant species, then it can be billed as “Robot for Gardening” – that’s more appealing.

I slept on a design for getting in the middle of a tall bed of plants to address something like a weed near ground level. Let’s say that a flying drone has a special attachment it can lower by cable. The top part of the attachment can open like an old fashioned fireplace bellows to gently but firmly push pry the intervening foliage out of the way. It may be weighted & need to direct the motion of the overhead drone while it is lowering the business end. The length of the funnel should be taller than the tallest plan in the bed so it never gets hooked underneath. At the point end, additional thin snake emerges. One type of snake can squit the right kind of liquid – fertilizer or weedkiller. Another type of snake for root kill, works as a very thin burning filament that travels down the interior of the weed to its root system.