Wormless; is what my garden is! I have been in it 3 years now. It was once part of a field and is on solid clay which floods when it rains and drains really slowly. I have created many raised beds for plants and vegetables but regardless of how much compost and manure I put on in I have yet to see a worm? This means that the compost etc is not being pulled down into the soil structure which is not being broken up by the worm activity. Can I purchase worms and introduce them to the garden and if I do will the thrive and multiply?