Saffron failed as it was my first try and had a completely unscientific approach. The fact that there are very few papers available didn't help.
Strawberries failed as I was unable to regular the nutrient supply perfectly for the breed I had. They were too weak. By the time I figured out what nutrients were to be used, I had lost motivation. So I switched to easier experiments like grass and lettuce.
I am not sure if rooted vegetables like ginger can even be cultivated successfully using hydroponics. That was my learning from saffron which has bulbs. What system do you plan to use NFT, DWC or drip? Some with ag background have done it; unfortunately, I know very less about plant biology.
Haven't written much about it other than tweeting about it occasionally.