Requester wrote:

Hello. do anyone know of a site that has detail info on the root
systems of trees? example: how deep/wide leyland cypress roots will
go. how thick they get ect. trees im most interested in a
leyland cypress
emerald green
colorado blue spruce
bluepoint junipers
japanese maples
burning bush
spreading yews

In general, most trees will have the bulk of their root system located
within the top 24" of the soil. There are some trees that will have tap
roots that extend deeper, but they tend to be in the minority. Spread of
the root system is harder to estimate - in deciduous trees, the roots can
spread out 2 to 3 times the spread of the mature canopy; some conifers
can develop a root system that will equal their height (i.e., a 60' Doug
fir can have roots extending outward an equivalent distance). Leylands
are known for having a fairly shallow but widespread and very dense root
system which complicates planting anything in close proximity. Thickness
of the roots will depend on how old and established the tree is.

pam - gardengal