Newly Posted Articles

LIMESTONE: Added to Potting Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For a mix of fir bark and redwood bark add 1/2 pound of pulverized high magnesium limestone to each cubic foot. A64-591; A75-437; this procedure not considered necessary, as the pH of the fir bark ... Read More

LIMESTONE: For Paphiopedilums

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago In nature warm rain does not dissolve the limestone substrate where Brachypetalum types grow; in greenhouses cold water dissolves an excess of the liberal supply sometimes erroneously added to the ... Read More

FUNGUS DISEASES: Of Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For an overview refer to N315+ Read More

LYCASTE CRUENTA: A Problem Plant

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Compost and cultural guidance: lycastes do well in tree-fern fiber, also in fir bark and peat moss mixes; also in osmunda and sphagnum moss; provide liberal watering and dilute fertilizing in the s... Read More

DENDROBIUM PHALAENOPSIS: New Growth Rots in July and September

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Several diseases can cause the injury; water early in the day and only enough. A72-55 Read More

ETHYLENE: Damage to Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Orchids are the most sensitive of all plants to ethylene; 1 part in five hundred million will injure opening flowers on cattleyas; references given. 72-534; mature flowers are more resistant than b... Read More

LEAF BLIGHT: Also Known as Leaf Die-back, Tip Burn

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Caused by fungus invasion; spreads gradually through leaf; cut it out before treating; infected areas show watery before drying; control with Benlate, or Anti-Damp, or Tersan. RMH Read More

LYCASTES: Breeding in California

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago For a review see W9-149 -- natural hybrids = questions and discussion about possible hybrids, variations in breeding, distribution and habitats in Guatemala and elsewhere; flowering months given in... Read More

CROWDING PLANTS: Do Not Do it

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Air circulation is very important in the growth process. OD72-227 Read More

BRACTS ON SPIKES: But Flower Buds Don't Show There

Author is Robert M. [Bert] Hamilton (Compiler), posted over 7 years ago Both oncidiums and phalaenopsis require a cool treatment of several weeks to promote flowering. A80-960 Read More