[roKWiz]

Originally Posted by Citroënbender

I think the area’s poor soil/subsoil is harder for trees to get a grip into, then they are forced upwards by needing light from overshadowing buildings, the built structures also channel/deflect breezes. Less buildings and more thickets of trees would be the ideal - but it won’t happen. Limb drop from redgums and bluegums seems to happen more after heavy pruning (large limbs, back to the trunk) in hot summers, I can’t quite work out the correlation but have seen it happen enough times.

The 5 large river reds at my place are more likely to drop limbs towards the end of summer without the wind. The trees soak up most of the moisture in the soil over the first part of the season.
When its wetter than normal the trees are good but after continually hot, dry conditions they will drop.

That's why up along the NSW coastline over Summer with the regular rainfall, cutting grass happens more often with no leaves on the ground, whereas its the opposite here, the heat tells the trees to take all the water and shed bark and leaves. The ground is left with no grass because of this, so I'm left with picking up leaves and not having to cut grass in Summer.

$ydney's sandstone layering should allow plenty of bite for tree roots to hook into but being sedimentary rock, it will easily part under high wind stress due to the cities well known southerly busters particularly along that funnel strip of Pittwater. Sailing in that body of water can be super sketchy at times.