Buy the 2015 Old Farmer's Almanac!
Reporting
Sure. You can put a raisedSure. You can put a raised bed on blacktop. Add a layer of gravel to the bottom to prevent the soil from leaking out with the water.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?