the genus odontoglossum (odm.) contains approx. 100 species. odontoglossum “margarethe holm” is a cultivar, based on odm. “hans koch” (odm. pescalo x odm. tusonia) and odm. bictoniense. sounds complicated but it is an easy to care for orchid.
odontoglossum “margarethe holm” does best in bright light with some morning or evening sun. a light shaded place such as winter sun will be tolerated.
cool to medium temperatures with a winter nights minimum of 10 °c/50 °f and summer day time highs of 25 °c/77 °c. at temperatures above it can stop growth until it’s getting cooler.
a special orchid mix must be used. regular potting soil is not suitable for growing odontoglossum “margarethe holm”. when the soil is going to break down after 2-3 years, it’s time to repot.
drench the soil well, water flowing out of the pot must be removed after a few minutes. wet legs can cause rotten roots. let it slightly dry between the waterings.
a half diluted orchid fertilizer can be given monthly in spring/summer and every six to eight weeks in fall and winter.
odontoglossum “margarethe holm” welcomes if sprayed over every morning, so the water can evaporate throughout the day. this gives the orchid some extra humidity if the soil gets a bit drier.
reblooming odontoglossum “margarethe holm”
after it has dried the flower spike can be cutted off, it will not bloom again. after blooming the orchid produces new shoots. eight to twelfe months later it will build its pseudobulbs. now the plant is ready for blooming again.
a few weeks at approx. 10-15 °c/50-59 °f can be helpful for building up new flowers. until it shows a flower spike it has to be kept a bit drier and must not be feeded.