Posted: 18/06/2015 at 06:50
The fact that you mention an oleander suggests to me that you're not in the UK but possibly somewhere warmer, as they're not hardy through our winters and need to be moved to a frost-free place.
Can you tell us where you are so that we can make some more informed suggestions?
Also you mention the toxicity problem - is this because of children? I ask this because it would also rule out some plants with spikey leaves etc.