Info on Feminized Seeds
In an experiment done in 1999 we grew 15 varieties
of feminized seeds. We started with 30 seeds per variety.
The goals were: 1) to determine the percentages of
female, male, and hermaphroditic plants. 2) to compare
the uniformity (homogeneity) among plants from feminized
seeds with those grown from regular seeds. 1. The
results were excellent. Nine out of fifteen varieties
had 100% female offspring. Percentages of female plants
from the other 6 varieties were between 80 and 90%.
These plants were all hermaphrodites, producing their
male flowers at the end of their lifecycle. Seed setting
hardly took place. No males were found. 2. Approximately
70% of the plants of varieties grown from feminized
seeds were far more uniform than plants grown from
regular seeds of the same variety. About 20% of the
varieties were a little more uniform, while in 10%
of the varieties no difference in uniformity was seen.
From literature and our own findings it appears that
the growth of a male or female plant from seed, except
for the predisposition in the gender chromosomes,
also depends on various environmental factors. The
environmental factors that influence gender are: a
higher nitrogen concentration will give more females.
a higher potassium concentration will give more males.
a higher humidity will give more females. a lower
temperature will give more females. more blue light
will give more females. Fewer hours of light will
give more females. It is important to start these
changes at the three pairs of leaves stage and continue
for two or three weeks, before reverting to standard
conditions. To produce our feminized seeds, we start
with selected female clones. Under standard conditions
these female clones do not produce any male flowers.
By the method we found, we are able to have these
female clones produce abundant male flowers and pollen
(see photos). The pollen thus produced we use for
the production of our feminized seeds