According to a recent study (based on the 2010 world population of 6.9 billion) by The Pew Forum, there are: 1  2,173,180,000 Christians (31% of world population), of which 50% are Catholic, 37% Protestant, 12% Orthodox, and 1% other. 2  1,598,510,000 Muslims (23%), of which 87-90% are Sunnis, 10-13% Shia.
Look for the distinctive male Hazelnut flowers, called catkins, which look like 2-inch to 3-inch long yellow or brown growths at the end of the tree branches. The male flowers grow in clusters of two to three and typically form in the winter months. 1  6.
About Filbert Hazelnut Trees. Because of their smaller size, Filbert trees (also called Hazelnut trees) are ideal nut trees for home growers. These trees can be grown naturally as large shrubs with many trunks, or grown as small trees through selective pruning.bout Filbert Hazelnut Trees. Because of their smaller size, Filbert trees (also called Hazelnut trees) are ideal nut trees for home growers. These trees can be grown naturally as large shrubs with many trunks, or grown as small trees through selective pruning.