I have to admit that I sympathize with Bobert. Yes he should check around before he mows, but it isn't fair for him to deal with tools and such strewn around helter skelter. Garden tools shouldn't be left out - all kinds of accidents could happen, like Bobert could step on the end of a cultivator and the handle could hit him in the face. And he claims that in the house, he doesn't leave his stuff lying around, so fair is fair. I think the plan is good, but it might upset P-Vine and she may get angry with Bobert. The passive/aggressive method would be to pick the stuff up and hide it. Then when she asks "Do you know where that cultivator/hoe/garden hose/watering bucket or whatever is?". Just say "Um....I think I remember picking it up but I just can't remember where I put it." Conveniently "forget" where you put it and when you think it's time, then remember.