Semi-Evergreen Azaleas lose some or most of their foliage in winter. Generally a 2-gallon azalea will measure 15-18 inches in diameter, a 3-gallon will measure 18-24 inches and a 5-gallon 24-30 inches. Light: Part shade/Sun Height: 3-5 feet Spread: 3-5 feet bloom: April Color: White