The two most important practices in every new planting-proper irrigation and good weed control-are often approached halfhearted­ ly by the grower (Gough 1982).

Highbush blueberries require a constant moisture supply. A ma­ ture planting should receive about 1-3 in (2.5-5 cm) of water per week during the entire growing season, or at least through the harvest period. This requires about 600-1200 gal per 1000 sq ft (2280-4560 1 per 93 sq m). Traditionally, selection of a site with a water table 18-24 in (45-60 cm) below the soil surface has met demands for water. For extra insurance, supplementary irrigation is strongly recommended in most growing regions and is considered absolutely mandatory in the Pacific Northwest area of the United States (Martin, personal communication).