Actually, I don't know! Each is different. I used to know more about orchids (i.e., when I lived in Hawaii), but ... information I don't need, gone forever! One I bought about 4 years ago! It has miniscule blossoms of dark yellow with brownish/orange speckles, many, many of them. When I'd just about killed it, I gave it to a friend with a greenhouse. She kept it for 2 years, and returned it when it bloomed again. So I got two lovely seasons from it over the years. It bloomed in the fall (both times) and the colors were so perfect for autumn! The others are slightly larger blooms, in varying shades of purple -- from white with pale lavender to a dark purple. The autumn toned one has blossoms the size of a woman's pinky finger fingerprint, the latter are larger bloom, more the size of the end of a man's thumb. The autumn has dozens of blossoms, last time on two spikes, the purples have about 10-15 each. When I buy them, it is for a pleasing winter gift to myself, a reminder of some lovely years of my life. As opposed to cut flowers, They've lasted for months. As a matter of fact, there is still one blossom on left on one plant and I bought it this past winter!