nerine bowdenii

I am trying for the second time to grow from bulbs Nerine Bowdenii,I know they should be planted  South facing  but I have a 3 foot wall there which causes shadows in the summer and the soil is usually damp,any other useful ideas on which part of the garden they might thrive,thanks

They like a baking, so they don't want smaller plants over the bulbs. They like it dry and do better when the bulbs get crowded so don't split them up

up against a wall, fence, large stone or something that holds the summer heat (assuming we get any this year), they just will not do in my garden, too rich and too moist - especially after last year. 

Thanks for your replies I will take your advice and try one more time in a hotter place in the garden.