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.
Seed dormancy: River birch seeds are non-dormant if germinated under long days (light for >16 hours). Seed germination: Sow seeds on the surface of the substrate in a nursery container to produce a seedling or sow them in a plastic container in the classroom under long day light conditions to observe germination.