In Switzerland, specific regulations apply to cannabis products, depending on their tetrahydrocannabinol (THC) content. According to official information from the Swiss government, cannabis with a THC content of 1 % or more is generally prohibited.
Products with a lower THC content (less than 1 %) fall outside the normal narcotics legislation and are permitted under certain conditions.
What applies to cannabis seeds?
Seeds themselves typically contain little to no active amounts of THC or CBD because the plant has not yet grown.
According to various sources, shipping cannabis seeds to Switzerland is permitted: "It is legal to send cannabis seeds to most countries within Europe. Switzerland is no exception, and you are legally allowed to have seeds mailed to your address."
At the same time, growing plants that produce cannabis with a THC content of 1 % or more falls under the Narcotics Act and is therefore prohibited.
Yes: The sale or shipment of cannabis seeds to Switzerland appears to be legal as far as the seeds themselves are considered and there is no evidence that they are being cultivated into prohibited THC-containing plants.
No: Growing plants from seeds that later develop illegal THC levels (≥ 1%) is either not legal or falls into a gray area.
Conclusion
The situation in Switzerland means that cannabis seeds can, in principle, be sold or shipped, but users should be aware of the risks: if seeds are grown into plants with too high a THC content, cultivation can become punishable.