This is a small plough attached to a yoke that sticks to the shells of a team of garden snails. The yoked snail team can then be set loose to wander round the flower bed leaving a neat furrow behind them.
Best deployed in a small area enclosed by the snail-discouraging metallic tape you can get to put round flowerpots, lest they make a break for freedom and your lettuces...-- prufrax, Dec 10 2012 Sherman_27s_20Hermits prior military version [xenzag, Dec 10 2012] Sail plow - The origin of this idea Sail Plow [pashute, Dec 11 2012] I quite this variation, as I'm always keen to see our friends in the animal kingdom given meaningful (and meaningless) tasks. [+]-- xenzag, Dec 10 2012 [+] They would be great in a little Zen Garden!-- xandram, Dec 10 2012 Faultless.-- MaxwellBuchanan, Dec 10 2012 Most gardeners I know wouldn't classify snails as "harmless," but you'd have to ask them for the gory details.-- DrCurry, Dec 10 2012 Shuck'm if they can't take a yoke.-- 2 fries shy of a happy meal, Dec 10 2012 Good one [2 Fries].-- AusCan531, Dec 10 2012 random, halfbakery