This info isn't something I've put on my profile page as it's not super attractive to biotech, but gardening has been a hobby of mine for many years (a degree in biology might also help). Additionally. I have a good deal of experience in tutoring and developing usable curricula.
With that in mind, what materials and goals do you have for this course? What level of expertise are you shooting for: Beginner, Novice, Advanced?
My last gardening project was splicing some plants together and building a custom designed rainwater watering system built on an old raspberry pi I had lying around, some cheap sensors and relay, and a submersible pump. Hopefully that lends some credence to my claims (not that I expect these sorts of things for your class since there's no crafting, just to relay my level of knowledge).
Anyway, I hope to hear from you as this sounds like a fun project. However, if not, have fun and good luck!