A.M.S.
Cannabis seeds
by Greenhouse Seeds
A.M.S. Feminised Cannabis Seeds by Greenhouse Seeds
A.M.S. is a feminised hybrid cannabis seed bred by Greenhouse Seeds, crossing a Swiss Sativa with a Swiss Indica from the Ticino region — a valley known for damp alpine conditions that would rot most strains before they finish flowering. The name says it all: Anti Mold Strain. If you're growing outdoors in northern Europe or anywhere humidity is a constant headache, this is one of the best feminised seeds for wet climates. She averages 15% THC and over 1% CBD, with an unusually high CBN content of 0.7% — a cannabinoid profile that leans heavily toward a relaxing, clear-headed effect rather than anything racy or overwhelming.
A.M.S. Cannabis Seed Pack Sizes
A.M.S. feminised seeds come in three pack sizes. If you're testing the strain for the first time, the 3-pack lets you run a small trial without committing. The 10-pack is the better deal per seed if you're planning a full outdoor run or want to select the best phenotype from a larger batch — and with this strain, phenotype selection matters (more on that below).
| Pack | Seeds | SKU | Best For |
|---|---|---|---|
| 3 seeds | 3 | CSGH0082 | First-time growers, single-plant setups |
| 5 seeds | 5 | CSGH0083 | Small indoor or balcony grows |
| 10 seeds | 10 | CSGH0084 | Full outdoor runs, phenotype hunting |
Why A.M.S. Seeds Stand Out for Outdoor Growers
Most cannabis strains treat mould like an inevitability — you just hope it doesn't hit before harvest. A.M.S. was specifically bred to resist it. The Swiss genetics behind this hybrid evolved in the Ticino region, where cool nights and morning fog create exactly the kind of conditions that turn dense buds into grey mush. Greenhouse Seeds crossed those hardy Swiss landrace genetics to produce a plant with genuine resistance to both mould and common pests. We've seen growers in the Netherlands and Belgium pull clean harvests from A.M.S. in seasons that wiped out their other outdoor plants.
The honest limitation? A.M.S. throws two distinct phenotypes. One leans Indica-dominant — stocky, fat-leafed, Christmas tree shape, heavy yielder. The other leans Sativa — stretchier, lighter buds, noticeably lower output. Greenhouse Seeds themselves recommend sticking with the Indica-dominant plants, and we'd say the same. If you pop a 10-pack, look for the seedlings with the widest leaves and the most compact structure. Cull or repurpose the leggy ones early. You'll thank yourself at harvest.
Compared to something like White Widow or Northern Lights for outdoor growing, A.M.S. won't give you the same raw THC punch — but neither of those strains will survive three weeks of September rain without turning to compost. It's a trade-off, and for outdoor growers in humid climates, A.M.S. wins that trade every time.
A.M.S. Strain Specifications and Cannabinoid Profile
| Specification | Detail |
|---|---|
| Seed Bank | Greenhouse Seeds |
| Genetics | Swiss Sativa x Swiss Indica (Ticino) |
| Type | Feminised hybrid |
| THC | 15% average |
| CBD | Over 1% |
| CBN | 0.7% average — a cannabinoid associated with sedative, relaxing properties |
| Indoor Flowering Time | 8 weeks (9 weeks for added bouquet complexity) |
| Indoor Yield | 600–700 g/m² |
| Outdoor Harvest | End of September |
| Outdoor Yield | Up to 800 g per plant |
| Mould Resistance | Very high |
| Pest Resistance | Very good |
| Phenotypes | Two — Indica-dominant (recommended) and Sativa-dominant |
| Aroma | Fruity, citrusy — intensifies after drying and curing |
| Flavour | Sweet, complex |
A.M.S. Cannabinoid Profile: What 15% THC and 1% CBD Actually Means
In a market flooded with 25%+ THC monsters, A.M.S. sits at a moderate 15% THC — and that's actually the point. The 1%+ CBD and 0.7% CBN create a cannabinoid ratio that delivers a clear-headed, introspective effect without the paranoia or couch-lock that higher-THC strains can trigger. According to research published in PMC, CBD has shown potential in clinical settings, with one randomised, double-blind trial comparing CBD to amisulpride in patients with psychosis, observing comparable clinical improvement (PMC5741114). The balanced profile of A.M.S. makes it a strain that many medicinal users find genuinely interesting.
The CBN level deserves a mention on its own. At 0.7%, it's higher than most commercial strains. CBN — cannabinol — is a mildly psychoactive cannabinoid that research suggests may contribute to sedative and relaxing effects. According to a study on neurotherapeutic compounds in Cannabis sativa, regular consumption of cannabis with varied cannabinoid profiles may interact with the endocannabinoid system through multiple pathways, with potential neuroprotective implications (PMC10821245). The practical result? A.M.S. is relaxing without being heavy. You can smoke it in the evening and still hold a conversation.
Growing A.M.S. Feminised Seeds: From Germination to Harvest
A.M.S. is a forgiving strain to grow, which makes it a solid pick if you're still building confidence. The mould and pest resistance means fewer emergency interventions, and the 8-week flowering time keeps your indoor cycle tight. Here's how to get the best from her:
- Germinate your A.M.S. feminised seeds using the paper towel method or directly in a propagation plug. Taproots typically emerge within 24–72 hours.
- Once seedlings show their first true leaves, identify phenotypes early. Look for wide, fat leaves and a compact, bushy structure — those are your Indica-dominant keepers. The Sativa-leaning plants will be noticeably leggier with thinner leaves.
- Vegetate for 3–4 weeks indoors under 18/6 light. A.M.S. responds well to topping and low-stress training, especially the Indica phenotype which naturally grows into a dense Christmas tree shape.
- Flip to 12/12 to trigger flowering. Standard flowering time is 8 weeks, but Greenhouse Seeds recommend giving her a 9th week — the extra time adds complexity to the terpene bouquet without significantly increasing mould risk, thanks to her genetics.
- Indoor growers can expect 600–700 g/m² under optimised conditions (600W HPS or equivalent LED, proper airflow, regular feeding). Outdoor growers in temperate climates should harvest by end of September, with yields up to 800 grams per plant under ideal conditions.
- Dry slowly in a dark room at 18–20°C and 55–60% humidity for 7–10 days. Cure in glass jars for at least 2 weeks — the fruity, citrusy aroma of A.M.S. genuinely improves with curing. The smell after two weeks in jars is noticeably sweeter and more complex than fresh-dried buds.
Terpene Profile and Flavour: What A.M.S. Actually Smells Like
Crack open a jar of properly cured A.M.S. and the first thing that hits you is citrus — sharp, almost like grapefruit zest. Underneath that there's a broader fruitiness, something sweet and slightly tropical. It's not the loud, skunky funk you get from Cheese or OG Kush varieties. This is a clean, appetising aroma that won't make your entire flat smell like a coffee shop basement.
The smoke fills your mouth with a sweet, layered flavour. There's complexity here that you don't always get from strains in this THC range — probably because the terpene profile has room to express itself without being bulldozed by raw cannabinoid potency. According to research on hemp seed terpene composition, beta-myrcene — a terpene commonly found in Swiss cannabis genetics — has demonstrated anti-inflammatory and anticatabolic effects in laboratory settings (PMC11085560). Whether that translates directly to the smoking experience is another question, but the terpene diversity in A.M.S. is part of what makes it feel more complete than its THC number alone would suggest.
A.M.S. vs Other Mould-Resistant Cannabis Seeds
If mould resistance is your primary concern, you've got a few options. Here's how A.M.S. stacks up against two other popular choices for humid climates:
| Strain | THC | CBD | Flowering | Indoor Yield | Mould Resistance | Best For |
|---|---|---|---|---|---|---|
| A.M.S. (Greenhouse Seeds) | 15% | 1%+ | 8–9 weeks | 600–700 g/m² | Very high | Balanced medicinal profile, humid outdoor grows |
| Frisian Dew (Dutch Passion) | ~14% | Low | 7–8 weeks | ~400 g/m² | High | Cold-climate outdoor growing, colourful buds |
| Critical (Royal Queen Seeds) | ~18% | Low | 7 weeks | ~600 g/m² | Moderate | Higher THC, faster finish, but less mould protection |
A.M.S. wins on yield and mould resistance combined. Critical gives you more THC but you'll be sweating every rainy week in September. Frisian Dew is a solid outdoor strain but produces noticeably less per plant. If you want the best balance of resilience and output, A.M.S. is the one we'd pick for a damp northern European grow.
Running A.M.S. indoors? Pair these seeds with a complete grow tent kit — tent, ventilation, and lighting sorted in one box. For outdoor growers, a quality pH meter and a bottle of organic pest deterrent will complement A.M.S.'s natural resistance and help you push those yields toward the 800g mark.
Frequently Asked Questions
Is A.M.S. a good strain for beginners?
Yes. The mould and pest resistance means fewer problems to troubleshoot, the 8-week flowering time is manageable, and the moderate 15% THC makes the end product forgiving to smoke. Start with the Indica-dominant phenotype for the easiest grow and best yields.
What's the difference between the two A.M.S. phenotypes?
A.M.S. produces an Indica-dominant phenotype (stocky, fat leaves, Christmas tree shape, heavy yields) and a Sativa-dominant one (taller, thinner leaves, lighter harvest). Greenhouse Seeds recommend keeping the Indica-dominant plants. Identify them early by leaf width and overall compactness.
How much does A.M.S. yield outdoors?
Under optimal conditions, each A.M.S. plant can produce up to 800 grams outdoors. Harvest by end of September in the northern hemisphere. Even in less-than-ideal weather, the mould resistance means you're more likely to actually bring that harvest home intact.
Why does A.M.S. have such high CBN content?
The 0.7% average CBN comes from the Swiss landrace genetics. CBN is a mildly psychoactive cannabinoid that contributes to the relaxing, non-racy character of the effect. Combined with 15% THC and 1%+ CBD, it creates a balanced profile that many medicinal users seek out.
Can I grow A.M.S. feminised seeds indoors?
Absolutely. A.M.S. performs well indoors with yields of 600–700 g/m² after 8 weeks of flowering. Give her a 9th week if you want more terpene complexity. She responds well to topping and LST, especially the Indica-dominant phenotype.
Is A.M.S. suitable for medicinal use?
The cannabinoid profile — 15% THC, 1%+ CBD, 0.7% CBN — makes A.M.S. one of the more interesting strains for users seeking a balanced, relaxing effect. According to research published in PMC, CBD has shown clinical potential in multiple therapeutic contexts (PMC5741114). Always consult a healthcare professional for specific medical guidance.
Last updated: April 2026
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Medical disclaimer. This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use of any substance.