Newly Posted Articles

STEMS: On Cattaleyas Not Erect

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago This is caused by too much shading or too much nitrogen, or possibly the plants shading each other. A82-487 Read More

PAPHIOPEDILUMS: Under Lights

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago No tight rules apply, let the temperature range be whatever seems reasonably normal but raise the lamps if it reaches the high eighties and add more air circulation; humidity is reasonably good in ... Read More

PENTA PRESERVATIVE: Treatment for Greenhouse Wood

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Boards treated 18 months before lose their toxicity to plants; the pentachlorophenol fumes can be sealed in by painting with boiled linseed oil, plus aluminum paint for looks. A72-341; Penta preser... Read More

PERLITE: As Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago A processed volcanic material, sized, but best for orchids over one-eighth inch in size; inert; inorganic; requires a balanced fertilizer such as 20-20-20 if used alone; mainly used as an ingredien... Read More

PERLITE: Composition

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago It is a calcined mixture of, principally, gypsum (Calcium sulphate) and white clay, with small amounts of other materials all heated to very high temperatures to cause incipient fusion and causing ... Read More

SHADING, GREENHOUSE: Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In New Jersey it is recommended to apply about 75 to 80% shading; or a light transmission of only 20 to 25%. A74-708 Read More

PHALAENOPSIS: Repot One Pot Inside Another

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago If the bark is firm and there are aerial roots, train the roots down and place in a slightly larger pot and fill the space with bark. FR111+ Read More

ANTS: Controls

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Chlordane is the best control; its toxicity is twice that of malathion and it penetrates skin. A68-583; A76-14; use chlordane or submerge pot in water for 10 to 15 minutes. F78-66; most ant sprays ... Read More

MOLD: In Terrarium with Osmunda

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Mold was induced by previously baking the osmunda twice at 200 deg.F. A76-895 Read More

PERLITE: Opinions of the Experts

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Some use up to 50% in cynbidium mixes and get excellent results; the horticultural grade #3, is coarse and stimulates root development; several growers believe it retains too much moisture at the b... Read More