I am going to assume that this is the 2nd spring for these plants. The ferns should die back as they provide nurishment to the roots cut them back in the fall. ph should be below 6.0 to 6.5. In the spring trim down the ferns and then mulch and keep them weed free, use organic mulch. If this is the 2nd year harvest lightly. 3rd year harvest normally. Cut them at ground level and don't let them get too big or they get fiberous. Take them at 7 to 9 inches. Keep an eye on them daily as they grow fast. They do not like soggy soil.