This group, formerly known as Odontoglossum orchids, have increased in popularity over the last 40 years. While many of these orchid plants have been transferred to the Oncidium family, there has been extensive breeding with other cooler growing types, making them very suitable for our Sydney climate. Originally from South America and with hybridising has come an extension of the flowering period, which can start as early as April and go to November/December.
The flowers can be up to 8cm or more in size and are often attractively marked. The range of colours now available is extensive with almost anything that you could desire being available somewhere. The whites are now challenged by reds and purples as the most eye-catching plants in orchid shows. A mature plant may carry over 100 flowers producing a spectacular display and the individual sprays of flowers can be over 1 metre long.
These orchids prefer a slightly cooler environment than many other epiphytic orchids. They require a medium bark mix which drains well, often supplemented with other media to hold a little more moisture than required for other orchids.
They also require some protection from the full sun, particularly in the hotter parts of our summer and appreciate misting to keep them cool during these times but otherwise thrive in the humid Sydney climate. Regular weak fertiliser is needed during active growth and the plant should not be allowed to dry out completely.
The Eastern Suburbs Orchid Society has an orchid show on the third Monday of every month commencing at 7.00 pm at the Kensington Park Community Centre in Hall 1, 1 Day Ln, Kensington NSW 2033 from February to December. Visitors are always welcome.