Polly Hill was an exceptional plantswoman from Martha’s Vineyard. Many of Polly’s azaleas are interspecific hybrids involving an incredibly compact azalea from Taiwan called Rhododendron nakaharae. ‘Joseph Hill’ is a trailing, red-flowered evergreen shrub that makes an excellent groundcover. Sun or shade. ‘Joseph Hill’ grows next to ‘Susannah Hill’ just beyond the canopy walk in the Helen S. Layer Rhododendron Garden.