Causes. The most common causes of megaloblastic anemia are deficiency of either cobalamin (vitamin B12) or folate (vitamin B9). These two vitamins serve as building blocks and are essential for the production of healthy cells such as the precursors to red blood cells.olate, which is also known as folic acid, is a B vitamin that is normally found in green leafy vegetables, citrus fruits, and certain grains and nuts. Folate deficiency can occur in diets that supply insufficient amounts of these foods.
While the Callery pear is popular for its attractive flowers, this tree puts on an autumn display of variegated foliage in red, purple, orange and yellow tones. The best time to prune your flowering pear is in late spring, once the flowers have passed for the year. credit: IT Stock Free/Polka Dot/Getty Images.
Asian pears are more rounded than European pears. Asian pear trees (Pyrus pyrifolia) are deciduous fruit trees that grow in well-draining, slightly acidic soil. They are more tolerant of wet conditions than many other trees, but they still need good drainage.Asian pears reach about 20 feet tall.They are spring blooming and summer fruiting, and grow in U.S. Department of Agriculture plant hardiness zones 6 through 9. Young trees need pruning to give them a good structure. Older trees are pruned for maintenance and to remove old non-bearing spurs.hey are more tolerant of wet conditions than many other trees, but they still need good drainage. Asian pears reach about 20 feet tall. They are spring blooming and summer fruiting, and grow in U.S. Department of Agriculture plant hardiness zones 6 through 9. Young trees need pruning to give them a good structure.