Serious Seeds is a small Amsterdam breeder run since 1995 by Simon, and has never grown beyond a handful of strains because each one is kept stable rather than replaced: AK-47, Chronic, Bubble Gum, White Russian and Kali Mist. For growers who value consistency, few catalogues are more dependable, and AK-47 remains one of the most awarded strains ever bred.
The Serious Seeds catalogue in numbers
Express Highs currently stocks 11 Serious Seeds varieties: 11 feminised and 0 regular, of which 2 are autoflowering and 9 photoperiod. 1 carry a medium or high CBD rating.
| Genetic profile | Strains |
|---|---|
| Sativa dominant | 1 |
Most popular Serious Seeds strains with Express Highs customers
- AK 47 Auto — autoflowering
- AK47 — photoperiod
- Chronic CBD — photoperiod, low THC (5-9%)
- Fruity Durban — photoperiod, sativa dominant, high THC (16-24%)
- Seriosa — photoperiod, high THC (16-24%)
- Seriotica — photoperiod, high THC (16-24%)
Which Serious Seeds strain to pick
For a quick or outdoor-in-the-north grow, start with the autoflowering lines. The photoperiod varieties give larger plants and bigger harvests indoors or in the Mediterranean south. Each strain page on this site lists flowering time, height and yield with planning notes for European conditions.
Where to buy Serious Seeds seeds
The full Serious Seeds range at Express Highs ships from EU stock with discreet packaging. Seeds are sold as collectable genetics; germination may not be legal where you live.
Frequently asked questions
How many Serious Seeds strains are available?
Express Highs stocks 11 Serious Seeds varieties: 11 feminised and 0 regular.
Does Serious Seeds make autoflowering seeds?
Yes — 2 of the stocked Serious Seeds strains are autoflowering.
Disclaimer
The information provided in this article is intended for informational purposes only and does not constitute medical, legal, pharmaceutical, or professional advice of any kind. Express Highs makes no representations or warranties regarding the accuracy, completeness, or suitability of the content for any particular purpose. Readers should not rely on this content as a substitute for advice from a qualified medical professional, legal counsel, or other relevant expert.
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