many trees are planted after development by homeowners and landlords who underestimate the size that trees will grow to and don't understand the space needs of trees.

and not all city planners today are well versed in landscape architecture.

i'm also willing to bet that parts of philadelphia were laid out by developers, architects, engineers and planners who also knew little about trees and did not hire landscape architects for their planting schemes.

this is obvious when you see a london plane tree planted within three feet of space.

these days however, i think the growth of trees is better understood.

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