The east-facing side of our lot has a hedge of established Formosa and George Lindley Tabor azaleas that were planted when the house was first built (late 60's), bordered with yellow iris. On the same exposure is a small half-moon bed with a single GLT that takes up much of the space and nothing else. I've been debating whether to add some companion plants next spring, but space is limited and I don't want to overcrowd. Suggestions?