Newly Posted Articles

PH (GENERAL): Of Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Experiments show that if a recommended medium is chosen the initial pH should cause no concern. Hort. revs. 1983-195 Read More

LAYERING: Of Cymbidiums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A form of layering to increase stock is to cut the rhizome between the bulb and well-rooted new growths; the back-bulbs (secondary) are thereby activated and start new growths; most main plants con... Read More

LEADS: Cattleyas' Tips Turn Brown

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago May be caused by over-fertilizing, or excess of soluble salts, or root injury; plan to repot early. A76-403 Read More

LEADS: Front

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Growing out of pot at blooming time; to avoid disturbing the roots of plants which need repotting, such as cattleyas, fill a plastic bag with sphagnum moss and perlite mix and apply to the roots ou... Read More

LEADS: Rough-textured

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Causes: several possible, such as injury forming a corky layer of scales, or cells may develop unevenly in the forming leaf, or a water/temperature relationship problem may cause blisters; none is ... Read More

LEAF BLIGHT: Pythium Splendens

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A water mold; shows as a round chestnut brown spot often at the edge of the leaf; enlarges rapidly and turns black and the area dries and thins; cut it out; apply Tersan to the whole plant; reduce ... Read More

EVAPORATIVE COOLERS: Use of Copper Sulphate on the Wet Pad

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Use 2 ppm. in the water periodically, A78-403 Read More

ETHYLENE: Plants Not Susceptible to It

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Paphiopedilums are very resistant; they can be grown well under lights; they can replace cattleyas and phalaenopsis. A68-331 Read More

LEAF DIE-BACK: Glomerella cincta

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Fungus starts at the leaf tip and spreads fully towards the base; areas turn brown, later dry out; cut it out; treat with Tersan. N318 Read More

HEATERS: Wood-burning Stove

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is apt to emit too much ethylene if it is not properly vented; burning wood is one of the worst sources of ethylene; it is now a crime to burn wood for heating purposes in London. A81-1436 Read More