London Mint Cake (T.H.Seeds)
Cannabis seeds
by T.H. Seeds
London Mint Cake Cannabis Seeds by T.H.Seeds
London Mint Cake is a feminised cannabis seed from T.H.Seeds that crosses London Pound Cake, Kush Mints, and pure Afghani into a 65% sativa / 35% indica hybrid built for flavour and easy cultivation. With a flowering time of just 8–9 weeks, indoor yields up to 700g/m², and genuine resistance to powdery mildew, this is the strain you grow when you want dessert-tier terpenes without babysitting your plants. T.H.Seeds have been breeding out of Amsterdam since 1993, and London Mint Cake is a solid example of why they're still relevant — it's genuinely tasty, properly potent, and forgiving enough for a first grow.
Pack Sizes
| Pack | Seeds | Best For |
|---|---|---|
| 3-pack | 3 feminised seeds | Single-plant growers or a test run |
| 6-pack | 6 feminised seeds | Full tent fills or pheno hunting across a few plants |
All seeds are feminised — no males to cull. If you're running a 1m² tent, 4 plants from the 6-pack in 11L pots is the sweet spot for hitting that 700g ceiling.
Genetics and Lineage of London Mint Cake
London Mint Cake descends from three parent strains that each bring something distinct to the table. London Pound Cake contributes the sweet, syrupy berry profile that dominates the inhale. Kush Mints layers in that cool, minty backbone and tight bud structure. And the pure Afghani landrace anchors the whole thing with resin production and growing resilience — it's the reason this plant shrugs off mould like it's nothing.
The resulting 65/35 sativa-indica split gives you a plant that grows with the vigour and height of a sativa but finishes on an indica-friendly timeline. That's a combination you don't always get. Plenty of sativa-leaning hybrids drag on for 11–12 weeks; London Mint Cake wraps up in 8–9.
| Specification | Detail |
|---|---|
| Breeder | T.H.Seeds (Amsterdam, est. 1993) |
| Genetics | London Pound Cake x Kush Mints x Afghani |
| Type | Feminised photoperiod |
| Sativa / Indica | 65% / 35% |
| Flowering Time | 8–9 weeks |
| Height | 120–170cm |
| Indoor Yield | Up to 700g/m² |
| Resistance | High resistance to powdery mildew |
| Terpene Profile | Berries, syrup, mint |
Growing London Mint Cake Seeds
London Mint Cake is one of the most forgiving strains we've come across from T.H.Seeds, and that's saying something for a sativa-dominant hybrid. New growers can run her in soil with basic nutrients and still pull respectable weight. Experienced growers running coco or hydro will push closer to that 700g/m² ceiling.
Left untrained, she develops a Christmas tree shape — a dominant central cola with shorter side branches tapering down. That's fine if you've got vertical space, but in a typical 1.8m tent, you'll want to top her early (around the 4th or 5th node) to spread the canopy and encourage more uniform bud sites. LST works well too. The branching responds nicely to being tied down, and the extra light penetration pays off at harvest.
Her standout growing trait is powdery mildew resistance. If you're in a climate where humidity spikes during late flower — the Netherlands, the UK, northern France — this matters more than most specs on the page. We've seen growers lose entire harvests to PM in week 7. London Mint Cake's Afghani genetics give her a genuine edge here. That said, she's not invincible: keep airflow moving and don't let your RH sit above 60% during flower if you can help it.
Height ranges from 120cm to 170cm depending on how long you veg and whether you train. In a 80x80 tent, flip to 12/12 after 3–4 weeks of veg to keep her manageable. Outdoors in a Mediterranean climate, she'll stretch toward the upper end and reward you with seriously chunky colas.
Flavour and Terpene Profile of London Mint Cake
This is where London Mint Cake genuinely stands out. The terpene profile reads like a breakfast menu: berries and syrup on the inhale, with a cool mint finish that lingers. It's not subtle — you'll taste it through a joint, but the real way to experience the full range is through a dry herb vaporiser set around 180–190°C. At that temperature, you get the volatile terpenes before they combust, and the berry-syrup-mint layering comes through cleanly.
The "pancake" descriptor floating around online isn't marketing fluff, either. There's a bready, doughy sweetness underneath the fruit notes that rounds out the profile. If you've grown or smoked London Pound Cake before, imagine that but with a menthol edge from the Kush Mints side. The Afghani parent adds an earthy, hashy undertone that grounds everything — stops it from being too candy-sweet.
One honest note: the mint comes through more in a vaporiser or clean glass than in a rolled smoke. If you're exclusively a joint smoker, you'll get the berries and sweetness but may miss the minty finish. Not a dealbreaker, just worth knowing.
Why London Mint Cake Is Worth the Tent Space
We carry a lot of seeds from a lot of breeders. London Mint Cake earns its spot because it hits three things at once that don't usually overlap: genuine flavour complexity, high yields, and low maintenance. Most strains give you two out of three. The tasty ones are fussy. The heavy yielders taste like hay. The easy growers are boring. LMC threads the needle.
Compared to something like T.H.Seeds' own Macaron — which leans more indica at 90–110cm and yields 500–600g/m² — London Mint Cake gives you more stretch, more weight, and a brighter terpene profile. Macaron has that gassy, creamy thing going on, which is great if that's your preference, but LMC is the better all-rounder for growers who want a single strain to fill a tent with.
The 8–9 week flowering time also keeps your turnaround tight. You can realistically pull three harvests a year indoors if you keep mothers or have clones ready. And because she's feminised, every seed you pop is a productive plant — no wasted weeks identifying and culling males.
The one thing to watch: she can get tall. If you're working with limited headroom and no training experience, she might outgrow a small tent before you know it. Top early, or consider a SCROG net to keep the canopy flat. That's the only real "gotcha" with this strain.
How to Grow London Mint Cake Seeds
- Germinate your seeds using the paper towel method or directly in a starter plug. Taproots typically emerge within 24–72 hours. Keep the temperature around 22–25°C during germination.
- Transplant seedlings into their final containers once the first true leaves appear. For indoor grows targeting maximum yield, 11L pots in a 1m² space with 4 plants works well.
- Veg for 3–4 weeks under 18/6 lighting. Top the main stem above the 4th or 5th node to encourage lateral branching and a more even canopy.
- Flip to 12/12 to trigger flowering. London Mint Cake will stretch during the first 2 weeks of flower — expect roughly 50% height increase from the flip point.
- Maintain humidity below 60% during weeks 4–9 of flower. Despite her mildew resistance, good airflow and moderate humidity will produce denser, more resinous buds.
- Harvest after 8–9 weeks of flowering when trichomes are mostly milky with some amber. Dry in a dark room at 18–20°C and 55–60% RH for 10–14 days, then cure in glass jars for at least 2 weeks.
Running London Mint Cake in a tent? Pair these seeds with a complete grow kit that includes lighting, ventilation, and a carbon filter — the mint and berry terpenes are pungent, and your neighbours will notice without proper extraction. A dry herb vaporiser is also worth grabbing to get the full flavour spectrum from your harvest.
Frequently Asked Questions
How long does London Mint Cake take to flower?
London Mint Cake finishes flowering in 8–9 weeks from the light flip to 12/12. That's quick for a 65% sativa hybrid — most sativa-leaning strains take 10–12 weeks. You can expect to harvest around 9–10 weeks after switching to flowering light.
What yield can I expect from London Mint Cake indoors?
Up to 700g/m² under optimised conditions — proper lighting, training, and nutrition. Realistically, first-time growers pulling 400–500g/m² should be well pleased. Topping and LST make the biggest difference in pushing yields higher.
Is London Mint Cake suitable for outdoor growing?
Yes, and it's actually one of the better choices for damp climates. Her Afghani genetics give her strong resistance to powdery mildew, so she handles rain and humidity better than most. She'll reach 150–170cm outdoors in a good spot.
What does London Mint Cake taste like?
Berries and syrup on the inhale, cool mint on the exhale, with a bready sweetness underneath. Best experienced through a vaporiser at 180–190°C. Through combustion, the mint note is less pronounced but the berry-syrup flavour still dominates.
Do I need to train London Mint Cake plants?
You don't need to, but you should. Untopped, she grows into a tall Christmas tree shape that can hit 170cm. Topping above the 4th node and applying LST gives you a flatter canopy, better light distribution, and more uniform buds — which directly translates to higher yields.
What is the genetic lineage of London Mint Cake?
She's a three-way cross: London Pound Cake x Kush Mints x pure Afghani. The result is 65% sativa and 35% indica. London Pound Cake brings the fruit and sweetness, Kush Mints adds the menthol edge, and the Afghani landrace contributes resin production and mould resistance.
How tall does London Mint Cake grow?
Between 120cm and 170cm depending on veg time and training. Indoors with a 3–4 week veg and topping, expect around 120–140cm. Outdoors or with extended veg, she'll push toward 170cm. Plan your tent height accordingly.
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.