Some stuff call westland ericasious compost has a ph of 6, thats why i picked it and it was pretty cheap, the space is only 5.5feet high x3wide x1.5 deep. think 10L pots will be as big as i can fit,
dont think all 4 will b able to be kept inside,dunno how bushy WR gets like???
want to try keep at leat 3 of em in ther.
i have a filter jug for my water keeps it below 6.5