Average pH for treatment combinations in containers of Rosa 'BAIneon': Aeration+ Potting Mix (AS40) (Top graph) and 1.0x rate top dressed (TD) (filled triangles) (not significant); AS40 with 1.0x rate incorporated throughout the container (IT) (unfilled squares) (not significant); AS40 with 0.75x incorporated in the top half of the container (TH) (filled circles) (not significant); All-purpose Potting Mix (PM2) (Bottom graph) with TD (filled triangles) (not significant); PM2 with IT (unfilled squares) (not significant); and PM2 with TH (filled circles) (pH=7.58-0.04WAP, P=0.01, R²=0.99, solid line) at 4, 8, 12, and 18 weeks after potting (WAP). Data points are means over lower and higher irrigation levels and four replications (n=8).