Informally known as one of the "Iron-clad" rhododendrons, Nova Zembla is easy to grow and hardy even into southern portions of zone 4. It has an upright habit growing to 5 to 8' tall, and 5 to 6' wide. Evergreen leaves stay green all winter. Attracts hummingbirds and butterflies. Covered with brightly colored flowers each spring beginning in April or May, depending on your zone. Zones 4-8. More heat tolerant than most, does well in all of zone 8.