We built some garden beds at our school today. We have had a great little veggie garden the last few years, but it had a bit too much shade and bit too little access to water. A very dedicated teacher spent the summers watering it without much help and without a spigot nearby. So, our very generous PTO agreed to fund a new garden using some wood taken down during the construction of our new playground. The new garden beds will have more sun and are very close to water. My husband designed the beds and went to buy all the supplies last night with my oldest daughter (while I took a bath and the little kids watched a movie!). Then, a great group of volunteers spent about 4 hours today building 7 beds that are approximately 4ft. X 8ft. We lined the beds to keep the existing soil and contaminants from the wood out and will be getting a delivery of a high quality soil/compost mix in the next week or so. I think they turned out great. I cannot wait to start planting. I just hope the kids enjoy it. The best part of this project is that we hope to have families in our school community sign up to care for the garden for one week over the Summer. They will be responsible for weeding, watering and harvesting (for themselves or others) for their assigned week. If we do well, we hope to take some extra produce over to the Food Pantry. Does your school have a vegetable garden?
MamaGrows
Mama is a Jack-of-all-Trades and a Master of None, well maybe some
MamaGrows 
There are a lot of grants out there right now to start school gardens. I hope you are able to champion the effort in your community. Empty lots are PERFECT!
This is such a great activity to provide to the students. Our local school, where our daughter will attend in the future, does not have a garden, but there is a vacant lot right next to the school that would be a perfect place to start one.