Newly Posted Articles

WATER, COLD: Splashing on Phalaenopsis Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Cold water causes leaf (mesophyll) collapse on the upper surface; a slightly sunken, light green pitting which is reproduced on the under surface, leading to the yellowing of the leaf. A75-498 Read More

WATER, COLD: Watering Damage to Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago There is no damage done using cold water to water plants; commercial growers no longer "temper" the water even when it is as low as 39 deg.F. A71-1021 Read More

WATER, HARD: Characteristics

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The critical factor is the soluble salt content; over 150 ppm. of calcium carbonate (CaCo/3) is hard, soap does not produce good lather; waters with less than 125 ppm. are excellent; up to 500 ppm.... Read More

WATER, HARD: Deposits on Tree-fern Rafts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago To dissolve these use a little nitric acid at pH of 4.0 to 4.5; add a few drops of dilute nitric acid to a plastic bucket of water and soak the rafts for 1/2 hour. A75-680 Read More

LIGHTS, GROWING UNDER: Sunrise-sunset Simulation

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Turn on half the lights in the morning four hours before the rest of them and reverse the procedure in the evening, with only 10 hours full light in the eyele; this will reduce temperature by seven... Read More

PARASITISM: In Orchids

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago There is a strong reason to believe that some epiphytes are in fact at least partially parasitic such as Ionopsis utricularioides, Leochilus labiatus, and Microcoelia exilis. A67-1010; A77-703 Read More

PARATHION: Toxicity Reactions in Humans

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Nausea, vomiting, diarrhea, salivation, nasal discharge, congestion, nervousness, tremor, dizziness and convulsions. A68-583 Read More

LIGHTS, GROWING UNDER: Wardian Cases

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The wonder of the Victorian era is back again, this time with the assist of fluorescent lights, to provide a case five feet long with 160 watts of light, with metal trays for humidity, Braun desk-t... Read More

WATER, HARD: High in Calcium and Magnesium Salts

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Its nature and characteristics and suitability for growing; has high electrical conductance; comments on water-softeners; refer to A67-466+; AH39 Read More

PAPHIOPEDILUMS: Yellowing of Leaves

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Caused by a deficiency of magnesium, especially among hybrids, it can be cured by watering witti Epsom Salts (Magnesium Sulphate), at the rate of one heaping teaspoon in a cup of warm water which i... Read More