I've never grown celeriac. Be interested to know how you get on with it Tripmeup. I've started harvesting Kohlrabi. Couldn't recommend it enough, it's very tasty indeed. Onions are nearly ready for harvest too. And my fennel is doing well. A lovely looking plant too. Corn has being doing poorly due to bad weather. Anyone getting decent size corn out in the open? Peas also doing very well, and just to remind new gardeners, you can still plant some peas, lettuces, radishes and kohlrabi and with a bit of luck, get a decent crop.