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 usually trained to an open center (shaped like a vase). Here are pear tree forms and the space they require: â¢ Standard-size pear tree can grow to 40 feet tall if not pruned and have a spread of 30 to 40 feet. Standard pears are commonly pruned from 15 to 25 feet tall with an equal spread.Plant standard pear trees 18 to 25 feet apart. Standard pears fruit in 4 to 8 years and can live for 75 years.sian pears are usually trained to an open center (shaped like a vase). Here are pear tree forms and the space they require: â¢ Standard-size pear tree can grow to 40 feet tall if not pruned and have a spread of 30 to 40 feet. Standard pears are commonly pruned from 15 to 25 feet tall with an equal spread.