Neighbors Have Planted 4 Now Huge (35-40’tall) Pittosporum Trees Right Next To Our Fence. Will The Root System Become Invasive An

Question

d damage our fence & patio slab? Would topping the trees make them fuller? All the mess falls on our side of the fence, so thinking a good trimming would help.a

Answer 1

I don't think the roots of this tree are terribly invasive, although they will seek out nearby water.
This article has a bit of info about trimming/pruning them: https://www.gardeningknowhow.com/ornamental/shrubs/pittosporum/growing-japanese-pittosporum.htm
It's okay to do a hard pruning on these: https://www.gardeningknowhow.com/ornamental/shrubs/shgen/rejuvenation-pruning-tips.htm