LIGHT should be strong, especially near the end of the growth period.
Early in the annual growth cycle, plants will tolerate less light - from 1,500 to 3,000
foot-candles. Plants grow best with light levels of 3,000 to 6,000 foot-candles, or 1/4 to
3/4 full sun. As pseudobulbs mature, harden them by giving slightly more light.
TEMPERATURE: These orchids are native to hot tropical areas and grow
during rainy summer months. During this growing period, day temperatures of 80 to 100
degrees F and night temperatures of 60 to 65 degrees F are beneficial. After growths
mature, temperatures should be reduced to 55 degrees F at night, with day temperatures of
70 to 85 degrees F.
WATER is critical for producing large pseudobulbs and strong flowerings.
Since these plants only grow for a short period, the plant must store a great quantity of
water. Water heavily as new leaves are forming. After the pseudobulb is mature, gradually
reduce watering frequency. The leaves will yellow and start to fall. At this time watering
should be stopped completely until new growth begins again. Water during this dormant
period only if the plant shrivels severely; over-watering may cause the pseudobulbs to rot
and die.
FERTILIZING is very important for producing strong
pseudobulbs. Use a
high-nitrogen formulation (30-10-10) while plants are in active growth, slowly tapering
off as new pseudobulbs form. Bloom booster formulation (10-30-20) should be used in the
fall except for plants that normally bloom in the spring.
POTTING is best timed to coincide with the start of new
growth(s), usually
in the spring. New roots will be produced quickly at that time, and plants will not
experience any setback. These plants have vigorous root systems and like to have a rich
and moist potting medium during their growing months. Many growers remove the plants from
the growing medium during the resting period to ensure dryness during that time.
Fine-grade orchid bark is common for smaller pots; medium-grade bark is used only on large
plants. Sphagnum moss is used successfully for plants in many areas, as it provides
tremendous water- and fertilizer- holding capacities. Some plants may be grown on slabs of
tree-fern or other material, which makes it easier to keep them dry during dormancy;
however, it is harder to keep them moist while growing. When well grown, these orchids can
be divided down to one mature bulb and then bloom on the next mature growth.
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