Raised asparagus bed
I have a shallow raised bed of asparaus which is just 3 years old and I am about to replace the temprary wooden edging used to create it. The new edging will allow me to increase the depth of the bed by about 3 inches giving the crowns a deep mulch of both manure and compost. Should I mulch to this depth straight away or do it over a couple of years? Aslo should I do it now just as it's about to starrt gowing or leave it to the end of the season?