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.
If you don't live in a land of extremes-not too hot, and not too cold-the highbush blueberry might be just right for you. The highbush is more heat tolerant than lowbush varieties, but less cold hardy. Highbush blueberries plants are much more vigorous than lowbush, and can reach heights of around 12 feet.The fruit of highbush varieties is larger overall than that of lowbush varieties, and is generally of a high quality.bout These Highbush Varieties... The following list of highbush blueberry plants are some of the varieties most frequently recommended by universities and extension offices. These varieties are also selected based upon their popularity with consumers.