The Philippine Orchid Society, Inc. is a non-sectarian, non-profit, and non-stock professional organization which specializes on Philippine orchids species and hybrids. It is popularly called “POS” among its members and endorsers alike. The group is based in Quezon City, however its members and affiliated garden clubs are scattered all over the country.

The POS holds two Orchid Shows per year which are:

1. The POS Annual Orchid & Garden Show - which is held during the last week of February to the first week of March (usually March 01 - 10) of every year, to coincide with the natural blooming of the Phalaenopsis (Mariposa) and the Dendrobium anosmum (Sanggumay) . 
2. The POS Midyear Orchid & Garden Show - which is held during August of every year to coincide with the blooming of the Vanda sanderiana (Waling-Waling) which is found in the logo of the society.  

The Orchid Show is a 10-day event, with an opening ceremony on a Thursday, and becomes open to the public the following day (Friday) up till the 10th day (which is a Monday). During this event, orchid landscape exhibits, plant judging competition, lectures, free clinics, and commercial sale of orchids, ornamental plants and garden accessories are held. This is a time for get-together for various garden plant enthusiasts, collectors and old friends.

The Philippine Orchid Society’s Objectives

The objectives of the Society are:

1. to promote and foster interest in the cultivation of orchids;
2. to aid in any possible way the development, improvement, preservation, conservation, and proliferation of orchids;
3. to conduct and cause to conduct scientific researches on development, improvement, preservation and proliferation of orchids;
4. to assist those engaged in growing orchids by such researches and information dissemination; and
5. to extend the knowledge, production, use, conservation and appreciation of orchids of any kind and in the Philippines and worldwide.