ScarletRose: We don't have a drainage problem but did add sand to our garden last year.
One of our co-workers told my husband to buy a good size load of night crawlers and add them to the garden.He said the worms would keep the soil from getting hard.I'm not sure if he's joking but he's going to try it.We got some 3 yr.old compost were using this year and it's really rich,nice and black.I also make a tea for my plants with that.