The city of Cambridge manages community gardens throughout the city. These are shared between residents; you can apply for a plot here. Priority is given to Cambridge residents with disabilities, and those with no other land on which to garden.
CitySprouts teaches children about gardening. They have a summer youth internship; it will happen this year, but youth will meet remotely every morning from July 6 to Aug 7. It sounds like a wonderful program. They may not be accepting applications any longer, but you can find out more on their website. They also have a "CitySprouts At Home" section on their website with lots of ideas for things you can do from home. They have great videos! , and videos.
We purchase most of our seeds from Johnny's Seeds in Maine.
We've added a new "Resources" menu item to our website. Let us know what else to add!