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PL THE PLANT
Only female plants make the flower people want, which is why sex is the grower’s first concern. Cannabis is unusual among crops in being dioecious: most plants are either male or female. Whether a plant is female, male or hermaphrodite decides whether it produces seedless resin-rich flower or a bag of seeds.
Female plants
Female plants produce the resinous flowers rich in cannabinoids and terpenes. If they are never pollinated they put all their energy into flower and remain seedless, the prized sinsemilla (“without seed”) condition.
Male plants
Male plants produce pollen sacs rather than flowers and carry far less resin. Growers usually remove males early so they cannot pollinate females, unless the goal is breeding and seed production.
Hermaphrodites
Under stress, heat, light leaks, damage, some plants produce both male and female organs. A hermaphrodite can self-pollinate and seed an entire crop, so growers watch for stray pollen sacs (often called “bananas”).
This is a failure mode to prevent, not a feature.
How growers control it
Because sex is decisive, most growers start from feminised seeds (bred to produce almost only females) or from clones of a known female. Regular seeds give a roughly even male/female split that must be sorted at flowering.
Why it matters
Continue exploring
XX/XY Karyotype, Ethylene-Mediated Feminization, and Pollination Yield Impact
Cytogenetic mapping shows that dioecious Cannabis sativa (2n = 20) carries nine pairs of autosomes and a heteromorphic pair of sex chromosomes in which pistillate (female) plants are homogametic (XX) and staminate (male) plants are heterogametic (XY), with the male Y chromosome noticeably larger due to subtelomeric retrotransposon accumulation (Divashuk et al., 2014, PubMed PMID 24465905). Despite genetic sex determination, floral organogenesis remains responsive to endogenous phytohormone signaling: ethylene promotes female carpel development, whereas inhibiting ethylene perception on genetically female (XX) shoots with foliar silver thiosulfate (STS) or colloidal silver induces viable XX pollen used to breed feminized seed (Lubell & Brand, 2018, DOI 10.21273/HORTTECH04188-18; Punja & Holmes, 2020, PubMed PMID 32670319).
Frequently Asked Questions
How early can you tell whether a cannabis plant is male or female?
Pre-flowers (primordia) typically appear at the fourth to sixth stem nodes after 4 to 6 weeks of vegetative growth, or within 7 to 14 days of switching to a 12/12 flowering light cycle: females extend two white stigmas from a tear-shaped bract, while males form round, stalked pollen sacs.
Why do growers remove male plants when cultivating cannabinoid flower?
Unpollinated female inflorescences (sinsemilla) continue producing new perigonal bracts and glandular trichomes throughout flowering, whereas pollination diverts plant carbon and energy into seed development and reduces cannabinoid and terpene yield by up to 50%.
What causes a female cannabis plant to turn hermaphrodite?
Both genetic predisposition and severe environmental stressors during flowering (such as light leaks during the dark period, extreme heat, or late-harvest senescence) can disrupt ethylene signaling and trigger staminate anthers ('bananas') on a female plant.
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