Neat plant in glass things, but.
How to measure actual useful plant growth. The projects I saw measured plant usage and waste. Things like heat, humidity, pH. If you add in the careful measurement of what goes in, you might get a good idea of growth. The only thing is, you don’t even know if it’s good growth. Tomato stems and carrot tops aren’t very filling. So I’m thinking. Water density, density density, colour.
Peter's stuff.