This is Epiphyllum Oxypetalum DC Haw. Otherwise known as the orchid cactus. It blooms in my garden at the end of July for one night only, then the bloom is finished for the year. It is sometimes referred to as a Night Blooming Cereus, however, this is a false term. It is not in the Cereus family.
Fall-planted bulbs produce the first blooms of next year's season. The bulbs spend the winter making roots and come up early in the spring. So if you think that autumn's the time to stop gardening, think again! It's bulb-planting time! Make sure you have the right tools for the job with the bulb-planting tools from DeWit Garden Tools. www.DeWitToolsUSA.com