Orchid doctor

HUMIDITY: For Cattleyas

Culture Orchid Doctor

by Robert M. Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 2 years ago.

Article Blog   Article Index
Set the humidifier at 70% relative humidity if the humidistat is reliable, and sensitive; set at 60% to 70% on one that is not. A65-438; phalaenopsis and cattleyas. A80-630
Share on Social Media:  
Log in to Add a Comment

More The Orchid Doctor Articles under the Heading Humidity

Humidity Comments
HUMIDITY: Additional Amount Applied to Cattleyas Do not use a tank-like enclosure; partially enclose the plant; if leaves are firm use a tray with pebbles and place the plant on it; if the room is dry add a humidifier. A70-235 0
HUMIDITY: Altitude Difference At sea level, which is where the phalaenopsis mostly grow, 100% relative humidity means a lot more water vapour per unit volume of air than at an altitude higher up, so there is a vast difference between 100% at sea level and 100% at 10,000 feet where the masdevallias thrive. OR82-27; A81-793 0
HUMIDITY: How to Lower It An air conditioner is needed, but plants prefer high humidity, with good air movement and with fans acting against condensation, which might favor the development of disease A67-139 0
HUMIDITY: Maintaining it The relative ineffectiveness of "damping down" compared with using misters; at 5,000 feet altitude or more the amount of water carried by the air can be about one-third reduced; to maintain it in the greenhouse various devices are available, such as a time-switch, a micronic timer, a solenoid valve, atomising water-jets, etc., refer to OR87-120 0
HUMIDITY: Maintaining it with a "gadget" A canvas soaker hose fastened to the top row of the finned heating pipes and with a slight flow of water leaking from it raised the humidity of a test area from 20% to 60%. A59-514 0
HUMIDITY: Measurements and Accuracy The often inaccurate needle-and-dial hygrometer can be calibrated in a jar using common chemical saturated solutions of known % relative humidity at 25 dC. A80-1382 0
HUMIDITY: New System Install a fan on the floor pointing upwards, with overhead water sprays not directed onto the- plants, so that humidity is increased to about 907o relative; this produces increased growth and no losses; refer to A85-960 0
HUMIDITY: Providing it Automatically One system uses three mist sprays per nine feet of length on each side of the greenhouse, activated by means of a solenoid valve controlled by a humidistat sensor; the standard hook-up. OR85-418 0
New Topics
  1. Susan Makar asked question "Aztec Gold" in category General Discussion
  2. Alison Brown asked question BLC can anyone tell me the hybrid name in category General Discussion
  3. Al Gerard asked question Nitrogen levels? in category General Discussion
  4. Raina Steiner asked question Ellison Onizuka in category General Discussion
  5. Paph hsinying jewel x paph hsying jewel september 09 2018 Adrienne Alexander asked question How to add a not-listed plant in category General Discussion
New Comments
  1. Ba2b503c 4be9 4833 b247 39f8b3d131c1 Gerri Palmer commented on member plant Rlc. Jungle Green by Sharon Stretton
  2. Image Carol Holdren commented on member plant V. Pachara Delight var. Pachara Delight Pink by Frances LaVigne
  3. Alison Brown commented on topic "BLC can anyone tell me the hybrid name" by Alison Brown
  4. Julie Ellner commented on topic "Phalaenopsis Hope Star" by Karl Olsen
  5. Image Carol Holdren commented on orchid Rlc. Princess Shasta
  6. Image Carol Holdren commented on topic " "Aztec Gold"" by Susan Makar
  7. Julie Ellner commented on topic "Any idea of this Cattleya?" by Juan Martin Cabrejos
  8. Image Carol Holdren commented on member plant Blc. Petch Sayam by Terence Kew
  9. John Appelbaum commented on member plant Blc. Hausermann's Charm by John Appelbaum
  10. Dsc 0747 Kathleen Kust commented on topic "Ellison Onizuka" by Raina Steiner