Please bear with me, I am a very very novice gardener
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My front garden faces due south. At the very front there is an ivy covered wall somewhere between 1 - 1.2 m high. My question is, for the purpose of choosing plants for behind the wall, do I want plants suitable for south facing spots, or north facing? 
If anyone has any ideas for what to plant there that would be amazing.. the ivy is staying as I think the wall may fall down otherwise..