Dendrobium bullenianum Rchb.f.
Dendrobium chrysocephalum, Dendrobium erythroxanthum, Dendrobium topaziacum
Color: Bright yellow
Bloom Time: Late summer to fall
Dendrobium bullenianum is a medium-sized, hot to warm growing, epiphytic species with slender, up to 2 feet (60 cm) long stems covered with ovate-oblong, up to 5.6 inches (14 cm) long leaves. It grows up to 2 feet (60 cm) tall and has clusters of flowers that arise on up to 2.5 inches (6.3 cm) tall, densely flowered, almost globose inflorescence from all along with the older dry canes. The flowers are about 0.8 inches (2 cm) in diameter. They are bright yellow to amber with stripes of red to purple. These strips often have a stronger color on the inner whorl flakes and the lip.
USDA hardiness zone 12a to 12b: from 50 °F (+10 °C) to 60 °F (15.6 °C).
How to Grow and Care
Although there is a huge variety from which to choose, when it comes to learning how to grow Dendrobium orchids, they all follow two important rules.
First, they like to live in little pots with their roots crowded into a tiny area. If you try to be nice and give them room to spread out, the roots are likely to stay too moist and begin to rot. If you don't like the look of a large plant growing in a ridiculously small pot, camouflage it in a larger planter.
The other way to care for Dendrobium orchids is to give them as much bright light as possible. This doesn't mean sticking them in the desert sunlight, but a south-facing window in the house is the place where they will thrive. In almost all cases, when your Dendrobium orchid isn't flowering, it's a case of not enough sunlight. See more at How to Grow and Care for Dendrobium Orchids.
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