Pine needles are seemingly the bane of any homeowner with pine trees in their yard. The acid in the needles can kill grass and plants; and they easily embed themselves in a rock garden or yard, making it impossible to remove them by hand or with a rake. While several products are currently awaiting patents, expensive methods such as a tow sweeper, a Cyclone Rake, and the "Dr. Leaf & Lawn Vacuum" are available. However, it is possible to do the job with a standard piece of home equipment that you can rent, or may already have in your garage.
Blow the pine needles out of the rock yard or garden with the leaf blower. Blow them into one area, or a pile. Dispose of needles once the rock area is cleaned, to avoid the killing of any plants or grass around it.
Wash the pine needles out of the desired area with a power washer. Rake the wet needles into a pile and dispose of immediately.
Combine Steps 1 and 2 if you have access to both machines. Blowing the leaves out first may get many of the needles, but not all. Using the power washer will remove any remaining needles, and wash out any debris left behind.