I am currently reviewing plans for a new Wal-Mart in the town that I work in and one thing we are considering is instead of requiring shade trees to be planted in individual landscaped islands in their parking area to instead require long landscape strips between the rows of parking. The reasoning for this is that we feel that the landscape strips will provide more shade for the parking lot and more root area hence a better living condition for the trees to be planted.

Two questions:

1) Do you agree with this reasoning regarding the notion that landscape strips provide more shade than individual landscape islands (spaced every ten parking spaces or so w/one shade tree)?

2) How critical is it from a shading perspective to orient the strips in an east/west direction thereby providing a northern and southern exposure as opposed to allowing the landscape strips to be oriented in a north/south direction.

I hope my questions make sense. thanks in advance for your responses.