http://durgan.org/2017/April%202017/18%20April%202017%20Asparagus/HTML/ 18 April 2017 Asparagus First of the season 2017 asparagus. The bed is permanent about 8 feet by 5 feet, and was planted with 11 crowns of Guelph Millennium about 9 years ago. It will be left one more day before harvesting. It is harvested about every third day for around 20 to 30 days. This year two stalks will be left on three plants and allowed to grow. The theory being that the growth sustains growing more stalks. This is a test of the theory. Last year 14 pounds were taken over the season, starting 10 May 2016, so the stalks are early this year..