A DC electromagnet is simply a coil of wire connected to a DC voltage source. It can have an air core or an iron core.
Northern Highbush Varieties. High Chill Varieties. Northern Highbush varieties are the most widely planted blueberries in the world. They grow best in temperate climates where total winter chilling is 1,000 hours or more.Except where listed, most Northern Highbush varieties are relatively self-fertile.orthland is the one of the most cold-hardy Highbush varieties. It is vigorous, easy to grow and adaptable to different soil types and conditions. Northland yields are heavy and the berries are sweet with high sugar content.
Blueberries â Celebrating 100 Years. Since the day the first crop of highbush blueberries traveled from farm to table, these little blue dynamos have been helping people lead healthier, more fulfilling lives. Itâs a legacy 100 years in the making. In the early 20th century, people didnât think blueberries could be domesticated, but Elizabeth White, the daughter of a New Jersey farmer, was determined to grow a flourishing industry for cultivated blueberries.