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How can I determine the sex of marijuana
cannabis seed plants with clones?
TAGS
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Onlinepot
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As compared to the observation of marijuana preflowers, forcing clones is an almost
foolproof method of determining sex. This method anticipates that the grower has
started
a batch of plants from seed. After several weeks of vegetative growth,
the plants should
have branched enough that cuttings may be taken. The marijuana
cuttings
should have at
least one node and be at least an inch and a half long.
Return Back To OnlinePot's Grow Guides
Main
Grow Page#1 Or Main
Grow Page#2
1. The seed plants are numbered or otherwise made distinguishable from each
other.
2. Take 2 cuttings from each seed plant. Each of these are given the same number
as their donor plant.
3. Root these cuttings and pot separately.
4. One representative clone of each plant is placed in a separate light proof
flowering area and the photoperiod there is changed to 12/12. Please note that
since these clones will be discarded after they show sex, that practically any
light source will serve our purposes here.
5. The other clones remain in vegetative growth. By the time the flowering
clones show sex, the now-identified as female vegetative clones are sexually
mature and ready to flower themselves.
6. For larger marijuana crops, retain both the donor plant and the non-flowering clone for
vegetative growth. Both may be used as mother plants to provide clones for
harvest oriented flowering.
What are preflowers?
Preflowers, as opposed to full
blown flowers, generally appear after the fourth week of vegetative
growth from seed. Check carefully above the fourth node. Please note that
preflowers are very small and and almost impossible to differentiate without
magnification. A photographer's 10x loupe is handy indeed when examining
preflowers.
As the images below demonstrate, the female preflower is pear shaped and
produces a pair of pistils. Frequently, the female preflowers do not show
pistils until well after the preflowers have emerged. Thus, don't yank a plant
because it has no pistils. Pistillate preflowers are located at the node
between the stipule and emerging branch.
Also, some female preflowers never produce pistils. A female preflower without
pistils is difficult to distinguish from a male preflower. Thus, hermaphodite
issues should not be resolved by the appearance of preflowers, without
pistils, on a plant otherwise believed to be a female.
Female (pistillate)
Female (pistillate)
The male preflower may be described as a "ball on a stick." However,
its most recognizable feature is its absence of pistils. Sometimes, a male plant
will develop mature staminate flowers after prolonged periods of vegetative
growth. These appear in clusters around the nodes.
The following image shows a male plant in early flowering. Staminate flowers are
located at the node between the stipule and emerging branch.
Male (staminate)
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