1 Cool season grasses are planted in the summer or early fall. Their vigorous growing season is mid to late fall. These grasses grow best in northern areas with cold winters and mild summers. Cool season grasses include the following:  Kentucky bluegrass, is a fine, dark green grass that grows well in shade.
The erector spinae or spinal erectors is a set of muscles that straighten and rotate the back.
Spinal stenosis may affect any part of the spine but is more prevalent in the lumbar spine. Lumbar spinal stenosis produces pain that may be felt in the buttocks, thighs, and calves when walking or standing. Cervical spinal stenosis affects the upper extremities and back.