Rosenthal E: Closet Cultivator
USA 1991 - 128pp.
in this book is presented as information to which the
public should have free access. The publisher does not
advocate or condone the breaking of the law. As we go
to press, it is still illegal to possess, cultivate, or
harvest marijuana in the United States of America. The
author is considered to be a leading expert in the field
and has brought his observations based on documentary
research to the printed page"
In the foreword, the author expresses his intention
to explain the issues in a manner understandable to
the average layman. In the preface he gives a brief
history of marijuana, and potential industrial uses
of the hemp plant in the present day or near future.
Chapter 1 - the theory, recommends growing many small
plants in confined spaces rather than fewer larger plants,
flowering when 8-16" high, and harvesting when
no more than 18-30 inches tall.
Chapter 2 - perspective - cites the advantages of small
gardens and the need to separate areas for vegetative
growth and flowering
Chapter 3 - the space - gives several suggestions for
converting rooms. closets and attics into growing areas.
Recommends under-floor heating or insulation to stimulate
root growth. I have examined many systems in attics
similar to those suggested by Rosenthal.
Chapter 5 - Novel gardens - mainly concentrates on training
plants to grow in particular ways. There is a diagram
of a sideboard converted to a growing area, again similar
in concept to the Kushti box.
Chapters 6 & 7 discuss the plant and various varieties,
recommending Dutch seeds such as Skunk, Northern Lights,
Early Pearl and Big Bud - giving some information as
to the development of each strain.
Chapters 7 to 17 deal with requirements of cannabis
plants, with lighting (fluorescents, High Intensity
Discharge lights, - metal halide/HPS) with a lumens/square
foot chart, discussion of the spectrum, reflectors and
cost. A separate chapter deals with lighting accessories
such as systems to move lights around in a circle to
illuminate a wide area, and on reflective sheeting for
the walls of the growroom. Chapters 10 and 11 discuss
rooting, container sizes, and growing media, citing
advantages and disadvantages of soil-based and hydroponic
systems, without recommending either. Chapter 12 suggests
a soil pH of between 6.2 and 6.8 (just on the acidic
side of neutral). Chapter 13 describes the watering
needs, and discusses automatic (drip feed) irrigation
and hydroponics, wicks & ebb & flow flood systems.
Chapter 14 discusses nutrients and fertiliser, warning
of the dangers of overfertilisation, and suggesting
high nitrogen for growth, and high phosphorus for flowering.
Chapters 15 to 17 deal with the air temperature (65-78oF),
humidity (40-65%) additional CO2
to replenish that lost by photosynthesis, and use of
filters or negative ion generators to neutralise give-away
Chapters 18 to 23 give practical instructions on taking
plants through the life cycle, including setting up
(testing the system), planting (recommends planting
directly in the growing medium, and discourages the
use of tissue paper) and transplanting cuttings. During
vegetative growth advises 18 hour light cycle, and has
photographs at different stages of growth. Advises flowering
when plants are 8-16 inches high, and harvesting at
18-36 inches. During early flowering, advises removal
of male plants as soon as their flowers appear. Shows
photographs of the flowering and fruiting stages with
explanatory text. Advises drying by picking the buds
and leaving in a warm dry place for several days, cautions
against forced drying. Chapter 23 gives details on how
to produce cuttings and clones.
Chapters 24 and 25 deal with problems, Ch. 24 deals
with plant diseases and insect pests, stating that most
losses are caused by overfertilisation. Chapter 25 outlines
the problems US growers face with the law, in a summary
of legal sanctions, their implications for human rights
and the US constitution, sentencing guidelines, and
a call to support cannabis law reform organisations.
Inside the back cover there are advertisements for other
growers guides and literature, but no hardware or growing
Rosenthal has produced a simple, well-written book
detailing all the major steps of indoor cannabis production,
with photographs and diagrams of grow-rooms and self-contained
boxes, with separate areas for different parts of the