If we raise prayer flags, they bless the elements that touch the mantras, for example, the wind. Then, animals and insects who feel this wind are purified of their negative karma, and it transfers their consciousnesses to higher realms. Also, when rain and water touches the flags, it blesses worms and other creatures in the ground and liberates them from the lower realms. -- Lama Zopa Rinpoche
Prayer flags are traditionally put on mountain tops or high places. Made from colorful cloth squares in blue, white, red, green and yellow, prayer flags can be hung either horizontally between trees or fastened vertically to posts (vertical or pole prayer flags). They can also be hung indoors to increase spiritual atmosphere.
It is very important to take note of the dates you hang your prayer flags. If you hang your flags on the wrong astrological dates, you will continually encounter obstacles for as long as the prayer flags last. Check for auspicious dates for hanging prayer flags on the FPMT Web site: