THE SOIL I HAVE THE BEST RESULTS WITH IS SUPER SOIL. IT SEEMS TO BE THE MOST CONSISTANT WITH PLUMERIAS, I MIX IT WITH ABOUT 25% PEARLITE OR PUMICE. THERE IS ALWAYS SOMETHING I WANTED TO KNOW HOW MANY POTS CAN I FILL. WITH A 2 CU.FT BAG
26 1 GAL
10 2 GAL
61/2 3 GAL
4 1/2 5 GAL
1 1/4 15 GALLON
EACH GALLON SIZE IS PER 2 CU. FT BAG .SUPER SOIL CAN BE BOUGHT AT MOST GARDEN CENTERS, THEY HAVE DIFFERENT TYPES OF SOIL BUT THE POTTING SOIL IS WHAT I HAD THE BEST RESULTS WITH. HAVE A GREAT GROWING SEASON.