Cherry blossom trees are called "Sakura" in Japan, and its flower is very familiar with people here. Usually, the flower is in bloom early in April, and people go cherry blossom viewing to places that have beautiful cherry blossom trees. It is like a picnic, since we keep the places with blue seat, and bring foods and drink. We call it "hanami".
Sakura reminds us a new life too. Not as same as western countries, our new life starts in April. People start going to school, woking at a company as a new member of society...etc. Therefore sakura is a symbol of beginning of new life. And of course, it is a symbol of spring too. What is the most beautiful in Japan is sakura I think. If you ask Japanese what is beautiful in Japan this time, I'm sure that most of them would say "It's sakura".
We even have "sakura front forecast" in spring in the weather news. The kind of sakura they pick up is someiyoshino. It is the most popular kind of sakura here. Its flowers come out in the spring first, and leaves come out after flowers fall. I don't like when both flowers and leaves are on the same tree since it looks dirty. The best time of sakura is when it has only flowers on its branches, and the second is when it has only leaves.
However, I like falling sakura too. Especially when it is in a Japanese style garden. If its petals fall in the pond, it looks pretty. Anyway, I like sakura too, and think that feeling calm with seeing sakura is a kind of feelings that most of Japanese have.