Hermaphrodite (Hermie)
Definition: A hermaphrodite, or hermie, is a cannabis plant that develops both female and male flowers. The male parts release pollen that can fertilize nearby female flowers, filling buds with seeds and lowering quality. Hermaphroditism can stem from genetics, environmental stress such as light leaks or heat, or a combination of both.
How Hermaphrodite (Hermie) works
Cannabis is normally dioecious, meaning individual plants are either male or female. Growers want unpollinated female plants, which pour their energy into resin-rich flowers instead of seeds. A hermaphrodite breaks that plan by producing its own pollen.
Two ways it shows up
- Pollen sacs: small green balls, like those on a male plant, hanging at the nodes. They usually appear in the first weeks of flower.
- Nanners: bare, banana-shaped anthers poking out of the buds, often later in flower. They can release pollen almost right away.
Common triggers
- Interrupted darkness from a light leak or irregular timer.
- Sustained heat stress, especially above 85°F (29°C) in flower.
- Severe nutrient problems, root damage, or heavy pruning late in flower.
- Genetics prone to intersex traits, which no environment can fully fix.
Reducing the odds
Start with stable genetics from a reputable source. Quality feminized seeds are bred and selected to minimize intersex traits, though no seed from any breeder can carry a 100% guarantee. Then keep conditions steady, especially the dark period.
What to do if you find one
Inspect every plant closely every 2 to 3 days from week 2 of flower onward. If you find only a few sacs early, pluck them carefully with tweezers and keep watching. If a plant is producing them across many nodes, move it away from the others or remove it, because a single opened sac can release a lot of pollen.