Crowdsourced gardening. You create an account, taking pictures of your garden. A cloud service stitches them together into a 3D model. GPS location and the h

Crowdsourced gardening. You create an account, taking pictures of your garden. A cloud service stitches them together into a 3D model. GPS location and the height of the various house/trees/walls are used to predict sunlight and shade. Historical weather is recorded and predictions of future weather are built in. Optionally the user can use cheap sensors or manual test kits to measure soil contents, moisture, acidity etc. Once the data is put in, the garden becomes part of the user's "profile" on the site. Others can examine it and make suggestions about what to plant, how to amend the soil, etc. User can log the things they do and upload photos (or use automated sensors and webcam to send periodic updates). You can "star" someone's garden to keep track of it and see how well their decisions worked. Would be a great tool for experienced gardeners with too much time on their hands, and busy newbies (who are nerds like me) to get free access to distributed knowledge to learn how to grow food in the back yard.