[antisthenes]

Trees are living organisms that need care and help adapting to a changing environment, so I'm not surprised.

The old and magnificent trees we see today in streets and neighborhoods suffer from extreme survivor bias. Many tree species aren't even that large/long-lived as people tend to think about average trees.

There's also a strong correlation between speed of growth and longevity.

Going for the quantity approach that many of these low-effort projects do is little more than just tossing seeds out of a bag onto the ground. In the end you'll get more trees than you had before, but probably not by much, and with varying success.