Try mixing a little cow manure into the bed.

I agree /with enriching and making soil more friable. I create raised beds with compost from our landfill and thats all i use. But I really really wonder about types of lilies. I know I have either modonna or easter lilies here but it's 90 degrees on at Gulf Shores which is about thirty milles due south with a heat index of 102 and 66% humidity =