I have just removed the top layer of a large corner of my lawn. The lawn was laid by the builder on rough farm land 36 years ago and he put down some kind of ash. The lawn has never been "nice" but serves a purpose. What can I do to help cultivate the soil in my new flower bed? It is ash type soil with clay underneath and needs help. I have bags of good quality multipurpose compost which is really for my pots later on but could I use this or should I buy some soil or similar matter?