Category: Orchid Doctor

CITRIC ACID: Used to Lower Ph of Water

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is a good chelating substance and could be responsible for excellent growth of some orchids; also metabolite of living aerobic systems; most plants manufacture their own. F68-114 Read More

CLASSIFICATION: Family Tree

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For a one-page chart of all classified genera, refer to David Sander's book Orchids and their cultivation (7th ed., 1969) Read More

CLASSIFICATION: The Dressler System

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For a review, refer to AU85(4)-16; for the classification itself see his book R.L.Dressler, The orchids; natural history and classification (1981). Read More

CLASSIFICATION: Why it Keeps Changing

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago For the scientific reasons, refer to W11-153 Read More

CLAY, CALCINED: As Cymbidium Medium

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago It is not as good as bark mixes, judging from an experimental growth trial of three years; for details refer to OA84-79 Read More

CLAY, CALCINED: As Cymbidium Mix

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago An aggregate used in making masonry blocks, it is good for culture in pots up to six inches; is alkaline in reaction; mix with bark for larger pots. OA82-6 Read More

CLAY, CALCINED: Expanded Nodules

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Most epiphytic orchids grow well in it; use 1-1-1 balanced fertilizer; it holds water and is aereated for good root growth; do not let it dry out; trade names are Crestlite, Haydite, Herculite, Tur... Read More

CLAY, CALCINED: Expanded Shale or Clay

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Aggregate material fired under great heat is like volcanic rock, porous, well-aerated but they differ in types; for a current valuation refer to A86-495 Read More

CLAY, CALCINED: Haydite

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago As a potting medium for angraecums, the seedlings can be started in it and grown on into a ten-inch pot in about five years and they flower well. Ca84Spring-3 Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More