What are the best trees to plant on a steep hillside that'll stabilize the land w/ a deep, wide root system?

Hillside is about 45 degree angle. Temps get to 90 - 100 degrees in spring/summer.We dont want the tree to grow more than 8 - 12 feet max or it will block the view.

At 8-12 feet you want a shrub, not a tree. Because I don't know where you live, your best bet would be to ask for the plant specialist at your state university's Extension Service. Their advice is free (well, paid for with your tax dollars) and they are experts on your climate limitations.

I do know that daylilies and Arctic lupine are both good ground covers for stabilizing soil. Iceland has planted the latter widely to deter wind erosion.

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