How many planets in the solar system have rings around them? There are four planets in the solar system that have rings around them, namely Jupiter, Saturn, Uranus and Neptune. These planets are classified as jovian planets, and they are massive balls of gas surrounded by rings and moons.
River Birch typicaly lives to about 75 years old but sometimes it can reach 80 to 100 years old in good sites. If a tree is planted wrong and/or in a wrong site it can cut its average livespan in half or even more.
This tree has a rounded canopy and grows to a maximum height of 70 feet and width of 60 feet. River birch trees grow rather quickly, at a rate of about 1.5 feet per year. By the age of 20 years, they usually are between 30 and 40 feet tall. Sweet birch trees (Betula lenta) are hardy in USDA zones 3 through 8. These water-loving trees feature sweet-smelling leaves and bark, which gives rise to the tree's common name. They grow at a moderate rate and present at about 6 feet tall at 12 years. By age 20, they have an average height of about 46 feet.