- sweet potatoes and
- I can't think of anything else but I am sure there is something that needs the extra protection of a greenhouse!
Also - I am experimening with an organic sweet potato. I have cut it in half and submerged both cut ends into individual jam jars filled with water. As the WWW advises, i should wait for the "chits" to sprout - oh sorry they are in fact "slips" which you can then pick off, submerge this into water and once they form a good root, pop into compost. It's worth a go!