Posted: 22/03/2015 at 07:27
What about just planting a load of early potatoes? Just the right time of year and you should get a crop in 12 weeks. Not too much maintenance to do - just some gentle weeding and earthing up.
You'd be surprised how many children just don't know where potatoes come from, and the magic of planting potatoes and getting lots back never ceases to amaze them. Then they can take the crop home with them or maybe you can even cook and eat them all together.
I did it with a group of young children years ago - each of them brought a couple of potatoes from home, most of them had started to develop shoots as that's what I'd asked for - but they don't need to have shoots - commercial growers don't chit potatoes. They were amazed at how they grew and how many potatoes they got and they were so proud to take them home and eat them - most children will eat potatoes