Top Hat Dwarf Blueberry Vaccinium x 'Top Hat' This compact, cold hardy dwarf shrub provides a show of plentiful white flowers followed by delicious, pea-sized light blue fruit. Foliage becomes bright red and orange before dropping in fall. Excellent for containers, creating a defined border or bonsai. Recommended chill: 1,000 to 1,200 hours which will occur in zones 3 through 7. Deciduous. Height : 1-2 Feet Width : 1-2 Feet Exposure : Full Sun Hardiness Zones : 3-8