I am starting up a huge veg garden and have brought enough seed for the first year but as we are going self sufficient, I wondered if I took the seed from the veg eg. courgette and cucumber that I had grown, would it grow into another veg plant?!! Do you have to do something special with the seed I have got from the veg? What about veg that dont obviously have seed eg. brocolli, carrott, parsnip? Can anyone recommend a good book or website? Thank you.