Nobile Type Dendrobiums
type Dendrobiums originate in the jungles of the Far East including
LIGHT† is easy to provide for these orchids. They require light shade conditions, as in the home in a west window, or near a south window. Some varieties can adapt to full sun as long as you have good air circulation. In the greenhouse, 3,000 to 5,000 foot-candles in general for most types. In the home, fluo≠rescent lighting is excellent; suspend two or four tubes 2 to 6 inches above the leaves.
TEMPERATURES cover a considerable range. Nobile type Dendrobiums traditionally require cool nights to set flowers but newer varieties have greatly reduced or eliminated this requirement. Older varities require† 50 to 60 F during the night and 75 to 80 F during the day. However, several new varieties will be good in a constant 70 tem≠perature range with excellent results. The plants can stand night temperatures in the 40s if necessary (as when grown outside in mild climates), as well as temperatures to 95 F.† Care must be taken to protect the plants from rot when cold (keep humidity low, and avoid moisture on leaves, and also to protect from burning when hot ( increase humidity and air movement around the plants). In lower temperatures the flowers last longer.
WATER must be available at the roots when blooming. This genus can take drying out better than most orchids surviving in the wild up to four months in the wild without hardly any rain. Nobile type Dendrobiums need to be thoroughly watered and then let dry out . Water about twice a week in our dry winters but more frequently when in bud, flower or new growth.†
HUMIDITY should be moderate, between 40 and 50 percent, which can be maintained in the home by setting the plants on humidity trays. In a greenhouse, average humidity is sufficient. Using an evaporative cooling system warm climates can increase the humidity. Air movement is essential, especially when humidity is high.
FERTILIZE on a regular schedule, but care must be taken to avoid too much nitrogen will cause poor flowering or production of Keikiís(off shoots). Nitrate based fertilizers are recommended. In warm weather, use one-half tea spoon per gal every other watering. It's important to flush with clear water monthly to leach excess fertilizer, which can burn roots. In cool weather, fertilizer applications once a month are sufficient..
P0TTING should be done about every year to a maximum of† two years, or as the medium decomposes. Seedlings and smaller plants are often repotted annually. Mixes vary tremendous≠ly; most are fine grade fir bark or coconut, with varying additives, such as per≠lite (sponge rock), and/or charcoal. Moisture retention with excellent drainage is needed. Large plants can be divided by pulling or cutting between growths of the leaves apart, into clumps of three to five growths. Smaller divisions will grow, but may not flower. Spread the roots over a small amount of medium in the bottom of the pot and fill with medium, so that the junction of roots and stem is buried 1/4 inch deep in the center of the pot. Do not over pot; an average plant should have a 4- to 6-inch pot.
FLOWERING can be controlled (Newer varieties will bloom without this treatment)by controlling temperature. After canes have completely matured (when tips of cane become round and hard) expose plants to temperatures below 57F for 25 nights consecutive† nights for a minimum of one hour(Best results 45-55 at night temp. in case you over fertilize).† Flower buds will be initiated and plants will bloom in approx. 50 days. Some of these newer varieties are Himezakura.† Spring Dream, and Sea Mary.
This text is a recommendation only, it is not an endorsement of any products or acceptance of any liability as a result of usage.