To grow a leafy tree requires more than thirty inches of rainfall or its equivalent each year. If you drive west across the United States, you can cross an imaginary line that passes through the Dakotas, Nebraska, Kansas, Oklahoma, and Texas, and beyond it deciduous, or leafy, trees are quite rare. Soon, so are conifers, the evergreens. Irrigation becomes a fact of life if you want to raise food or flowers or even a lawn.
The Great Plains eventually pass into desert – and you might be surprised to discover that most of Oregon, Idaho, and Washington state is actually desert. The rainy belt is little more than a thin band along the Pacific-facing side of the Cascade and Olympic mountains.
Quite simply, it’s a different world from the one most Americans know.
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As for the Great Plains, let me recommend Kathleen Norris’ Dakota. It’s a unique and marvelous book.
Jnana's Red Barn 