Posted: 11/04/2014 at 12:18
Hi, what I do is take about a foot away out of the pots, fork in some Fish, Blood and Bone. Now is the opportunity to put some Hort Grit in to if drainage needs improving. Then replace with fresh multi-purpose compost. That way you are not throwing so much away and you are not using to much fresh multi-purpose compost. Hope that helps.