Our raised beds are 20 yrs old now. In the fall we cut the stalks down, and throw the female bows with the berries back on as mulch and cover with an inch or two of cow poo. Has worked well for us. It takes 4 yrs to establish a bed with large stalks. Many of ours are now the size off hoe handles and remain tender until 12-16" tall We quit harvesting the 5th of June this year.
Loren, the Acg.