I grow perpetual spinach and chard generally and don't bother with ordinary spinach ( I like the stuff from cans in Indian stores!) joking aside, in Autum I put in loads of chinese leaves and pak choi too. I put them in after the lettuces have finished, so as to get two crops per year from the same plot ( then rotate of course).
You don't need to plant the Chinese veg type seeds before mid July, then you can also sow some more mid August or so, and get more new growth as late as November.
Due to the awful frosts all my greens have now died back, but I do see some young shoots of perpetual spinach coming up already ( end of January).
- Roll on March not very long now, and we can get things growing again.