Asparagus Plant Spacing
I am getting a large bed together for planting asparagus in the spring, and I am wondering if anyone has any experiences to share (good or bad) with SFG asparagus. Mel says plant one or four crowns per square foot. Most asparagus planting instructions are for planting rows, but they indicate that spacing too-close can decrease yields and increase the risk of fungal disease. Four per square foot seems like too many. Instructions that I have found for planting asparagus in a raised bed says to ensure that the plants are at least sixteen to eighteen inches away from the edge of the bed, for frost protection. That would rule out even one crown per square foot. My asparagus bed will be 4' by 12'. How many crowns would be "right" for that space? I live near Toronto, ON, zone 6A.