I'm planting a rose hedge. I've got 9.5m to cover and I've ordered ten roses. I should order more for a fuller impact immediately but I can't justify spending more at the moment. What companion plants would you recommend? I've read about salvias, catmint, geraniums, lavender... Is there anything else a bit more unusual I could consider? The rose is called Olivia Rose Austin. It's a west facing area with lots of sun.