Be sure to get a soil test just to see where your nutrients and pH are. In Kansas, our soils are naturally high in potassium and low in phosphorus. However, our garden soils are usually high in both as people have fertilized for years. I'm sure your virgin soils in Maine are quite different but it is helpful to have a base line before adding amendments.
It is always a good idea to mix compost and soil rather than making a thick layer of compost on top of soil as roots do not like to move from one to the other or even one soil type to another.
By the way, raised beds are a great way to grow vegetables. You have excellent drainage so water doesn't sit, super aeration for a healthy root system and hopefully few weed seeds.
It is always a good idea to mix compost and soil rather than making a thick layer of compost on top of soil as roots do not like to move from one to the other or even one soil type to another.
By the way, raised beds are a great way to grow vegetables. You have excellent drainage so water doesn't sit, super aeration for a healthy root system and hopefully few weed seeds.