In cultivation , Rhododendron spinuliferum grows best in acidic soils of pH 4 -- 6 with a shady aspect and significant organic material in the soil .
Excess shade will result in few flowers and leggy habit .
In cultivation , Rhododendron spinuliferum grows best in acidic soils of pH 4 -- 6 with a shady aspect and significant organic material in the soil , although excess shade will result in few flowers and leggy habit .