Newly Posted Articles

CYMBIDIUMS: Night Water Sprays

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago From July 1 on, water sprays will help produce temperature differential to make the plants spike. OD76-122 Read More

HEART ROT: Phytophthora Omnivora

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Fungus, causes rot where leaf meets the stem; dark, sharply dilimited lesions appear first in heart of the plant; spreads rapidly if not dry; vandas, phalaenopsis and even cattleyas are most suscep... Read More

HEATERS: Emergency, for Greenhouses

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Aladdin series of kerosene heaters are recommended; should burn properly adjusted. A72-631 Read More

HEATERS: Flue Pipe with Fins

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Make your own: on a roll of lightweight lawn edging aluminum four inches high use shears to cut slits 5/8 in. apart from the lower edge inward for 3in. along a length necessary to wind it up spiral... Read More

HEATERS: Infra-red New Types

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago They are efficient systems that use either natural gas or propane/butane mix to fire burners and a special pipe emits infrared waves which heat the plant benches, the floor, etc,x and not the air; ... Read More

HORMONES: For Node Culture on Phalaenopsis

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago On an immature stem remove the bract covering a node; with a razor blade cut down the center of the bract and pull the two sides apart; brush the paste around the node; next day it starts swelling;... Read More

HOT TUBS: Area Used for Growing

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Chlorine or bromine used to sanitize hot tubs should not harm plants in the area; people grow them around swimming pools which emit chlorine fumes; do not close-in the area. A84-819 Read More

HEATERS: Unvented

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago A heater using natural gas, no shortage of air and a clean burner is satisfactory. A81-266The flame consumes the oxygen in a tight greenhouse and the flame then does not burn properly and fumes beg... Read More

HUMIDITY: Maintaining it with a "gadget"

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More

HUMIDITY: Measurements and Accuracy

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago 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 Read More