Photo (hopefully) attached! The circle is about 1.5ft across, there are six canes. I have a load of Thunbergia seedlings in three different colours, with which I hope to create a riot of colour and cover up that nasty rusting washing pole on my lawn 
Would you plant one per cane? Will that be enough? I seem to remember that one plant will throw out multiple vines....but I don't want it to look thin and patchy!