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How can I determine the sex of marijuana
cannabis seed plants with clones?
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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