My wife is trying to teach our little girl how to pull weeds (she's only 16 months). She loves to pick things up, hand them to us, and say "tank ooo" (thank you - that's what we always say to her, so she repeats it). Now to just get her to distinguish weed from plant.....
Be prepared to wait a little longer. My youngest is 26 months and snapped the flowering top right off the onion I was letting go to seed the other night.
The worst part is that of the 7 onions I left to go to seed this year, that was the only one that flowered. And now I have nothing. With no onions surviving transplant/deluge this spring, I won't have onion seeds until 2013 unless by some miracle I can plant some that will survive the winter.