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Best Azaleas For Deep Shade . For areas with more sun, check out our encore azaleas. Dig a hole that’s as deep as the plant’s root ball but a little wider. Azaleas How to Grow and Care for the Azalea Bush HGTV from www.hgtv.com A set of four are included. This provides a very wide variety of plant habits, sizes, colors and bloom times for every landscape need or personal preference. Reliably hardy to zone 4, they sometimes will even survive in zone 3 gardens.