hi,ive recently brought a felix jury magnolia, its in a 4lt pot and it is starting to loose it big leaves, which is the normal thing for the type of year, the problem is that ive left the pot standing in a contaner of water for to long and when i checked on the roots they seem to have going slightly black on the ends. I have now got the pot out of water but the bottom still seems very soggy. should i repot as i was thinking of doing this at some point ? also can anyone advise on what is the best compost to buy and do i need to use a slow relise rhododendrone fertilizer in with the soil .im keeping the magnolia indoors as it is only a young plant . any advise would be great.