What usually makes these trees vulnerable is poor drainage. The ground gets very wet, water doesn’t drain properly because there’s nowhere for it to go, and then the trees lose their footing, so to speak. Up and over they go. Tree roots are surprisingly shallow. If you go look closely at an overturned tree, you’ll be amazed at how little root system there is for such a big creature. Especially if the roots have been constricted by substructure concrete for roadbeds. Trees need to spread their roots to be more stable.
Dominique Browning on growing safer trees – a pragmatic guide. Complement with a poetic meditation on trees by Herman Hesse and a look at the oldest living trees in the world.