Kent,
United Kingdom 
hi everyone, can you help me with a crimum bulb decided to buy one, and put in pot, what soil do you recommend, how deep...… lots of different views on u tube.xx
10 Mar, 2019
below is the link to the RHS advice:
https://www.rhs.org.uk/Plants/90456/Crinum-x-powellii/Details
hope it helps. [seems it isn't fussy about pH]
if it isn't C x powellii then just type in the correct name in the RHS website.
10 Mar, 2019