When choosing hemp seeds, you often come across terms like photoperiod, autoflowering, or fast-flowering. These terms describe the botanical developmental characteristics, in particular how plants respond to different light conditions and how their vegetative growth phases are structured.
In this article, we explain the differences – factually, technically, and legally sound – so you can better understand the properties of the various genetic types.
Photoperiod Genetics: Growth Controlled by Light Signals
Photoperiod plants regulate their growth according to the natural rhythm of day and night.
Vegetative Phase
Under stable light conditions (e.g., 16–20 hours of light and 4–8 hours of darkness), photoperiod plants develop:
- Leaf mass
- Internode structures
- Root systems
- Stem stability
This phase is legally permissible in Austria, as it is limited to vegetative development.
Botanical Background
Photoperiod plants possess phytochromes – light-sensitive proteins – that process signals related to day length and dark periods. This makes this group one of the classic models in plant physiology, and it is often cited in botanical textbooks as an example of rhythm-controlled growth development.
Outdoor Cultivation
Under natural sunlight, photoperiod species orient themselves according to seasonal light conditions. Depending on the latitude, the duration of the growing period varies.
Autoflowering Genetics: Development Independent of Day-Length Stimulus
Autoflowering lines (also called “automatic genetics”) are characterized by a time-dependent developmental structure.
Their vegetative phase is not primarily based on the length of the light cycle, but on the genetically determined development period.
Botanical Explanation
Autoflowering plants contain genetic components of Cannabis ruderalis, which are responsible for:
- High resilience against climatic fluctuations
- Compact growth structures
- Time-controlled development
Vegetative Care
For growing vegetative autoflowering plants, stable light periods (e.g., 18–20 hours of light) are commonly used. They are well suited for beginners, as their structure is quite robust.
Fast-Flowering Genetics: Breeding for Faster Development Cycles
Fast-flowering lines result from crosses of photoperiod plants with genetic components from automatic lines.
As a result, they possess:
- Shortened development cycles
- Stable growth structures
- Uniform vegetative development
Botanical Background
Through hybridization, the speed of certain developmental processes is increased without completely altering the fundamental photoperiod response. These genetics are frequently used in breeding research to develop robust and adaptable plant lines.
Feminized Hemp Seeds: Genetic Stability in Plant Development
Feminized seeds are selected so that they express female plant characteristics with high probability.
Botanically, this means:
- Less variability in sex expression
- More homogeneous growth structures during the vegetative phase
- High stability in breeding programs
This selection method is an international standard in seed development and serves to promote uniform plant structures.
Important: References to further developmental phases are provided purely from a botanical perspective and do not constitute instructions for cultivation beyond the vegetative phase permitted in Austria.
Conclusion: Three Genetic Types – Different Botanical Properties
- Photoperiod: light-signal-controlled structural development
- Autoflowering: time-dependent development and robust vegetative traits
- Fast-Flowering: hybrid rhythms with a stable vegetative foundation
That is why at Schall & Rauch we carry a diverse selection of high-quality genetics from leading seed banks such as Barney’s Farm, Fast Buds, Paradise Seeds,Dutch Passion and other international breeders.