The answer to the question regarding how far to space a tree, shrub or plant is fairly straightforward...

When planting any shrub or tree near a driveway, walkway or other traveled surface you want to space the plant a distance from the edge of the driveway or walkway at least half the maximum mature width that the plant will grow. Spacing should be "on center," which means from the center of the plant to the edge of the driveway or other surfaced area. That said, I always add a couple feet to that distance because over time a plant might grow a little wider than listed. 

For example, if you are planting a shrub that is known to grow 8 to 10 feet wide at maturity, this means you'd space the center of the tree a minimum of 5 feet away from the edge of the driveway. If you want to be safe maybe add a foot or two to that distance and plant 6 to 7 feet away from the driveway.

Note: Some large growing trees have extensive root systems with large roots that naturally bulge above the surface of the ground and therefore could cause damage to concrete, pavers or asphalt surfaces. When in doubt about whether or not a specific type of tree can damage these hard surfaces, consult with a local arborist or professional landscaper as to proper spacing.

Hope this information was helpful. Let us know if you need more details.

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