Permanent Marker
Cannabis seeds
by Blimburn Seeds
Permanent Marker Cannabis Seeds by Blimburn Seeds
Permanent Marker is a feminized photoperiod cannabis strain from Blimburn Seeds that delivers up to 34% THC and yields of up to 850 g/plant outdoors. A three-way cross of Biscotti x Jealousy x Sherb Bx, this hybrid packs serious resin production into a compact, pest-resistant plant that suits growers at every level. If you want a strain that stays in your rotation permanently, this is the one.
Why Permanent Marker Seeds Deserve a Spot in Your Grow
We've seen a lot of hype strains come and go over the years. Permanent Marker isn't one of them. This Blimburn Seeds release combines three heavy-hitting genetics — Biscotti, Jealousy, and Sherb Bx — into a feminized hybrid that actually delivers on its promises. The plant stays short, shrugs off pests, and coats itself in trichomes so thick the buds look like they've been dipped in sugar.
The real draw here is the combination of potency and flavour. At up to 34% THC, Permanent Marker sits at the very top end of what's commercially available in seed form. But it's not just a numbers game — the terpene profile produces genuinely sweet, candy-like flavours with a light floral finish that lingers. You'll smell it before you see it, and you'll remember it long after.
One honest note: with THC levels this high, Permanent Marker isn't the strain to hand to someone who's never grown or consumed cannabis before. It's a powerful plant that rewards experienced growers and seasoned consumers. If that's you, read on.
Permanent Marker Genetics and Terpene Profile
The lineage behind Permanent Marker reads like a who's who of modern American genetics. Biscotti brings the dense bud structure and cookie-dough sweetness. Jealousy adds resin production and that slightly gassy edge. Sherb Bx rounds things out with creamy, sherbet-like terps and a compact growth habit. The result is a hybrid that leans slightly indica in structure but delivers a balanced effect profile.
Terpene-wise, expect a dominant sweetness — think pick-and-mix sweets rather than fruit. There's a floral undertone that keeps it interesting, stopping the flavour from becoming one-dimensional. According to research published in PMC, beta-myrcene — one of the terpenes commonly found in cannabis — has demonstrated anti-inflammatory properties in human chondrocytes (PMC11085560). And limonene, another common cannabis terpene, has shown immunomodulatory properties in laboratory settings (PMC12154244). Whether these specific terpenes are dominant in Permanent Marker depends on your phenotype and growing conditions, but the genetics certainly favour a rich terpene expression.
| Specification | Detail |
|---|---|
| Seed Bank | Blimburn Seeds |
| Genetics | Biscotti x Jealousy x Sherb Bx |
| Seed Type | Feminized Photoperiod |
| THC Content | Up to 34% |
| Flowering Time | 8-10 weeks |
| Indoor Yield | Up to 550 g/m2 |
| Outdoor Yield | Up to 850 g/plant |
| Outdoor Harvest | Mid-October |
| Plant Height | Short/compact |
| Seeds per Pack | 3 |
| SKU | CSBL0043 |
Growing Permanent Marker Seeds: Indoor and Outdoor
Permanent Marker is a compact grower that stays close to the ground throughout the entire cycle — good news if you're working with limited vertical space in a tent. The plant's natural resilience to pests means you'll spend less time troubleshooting and more time watching trichomes develop. As a photoperiod feminized strain, you'll need to flip your light cycle to 12/12 to trigger flowering, but that's standard procedure for any photoperiod grow.
Indoors, expect 8-10 weeks of flowering before harvest. The compact structure responds well to low-stress training (LST) and SOG setups, helping you maximise that 550 g/m2 potential. Because the buds get incredibly dense and resinous, keep your humidity below 50% during late flower to avoid mould. That's the one thing to watch — dense buds and high humidity are not friends.
Outdoors, Permanent Marker thrives in warm, Mediterranean-style climates. Plants will be ready for harvest around mid-October, and in optimal conditions, you're looking at up to 850 g/plant. That's a serious haul from a plant that doesn't tower above your fence line.
- Germinate your Permanent Marker seeds using the paper towel method or directly in a starter plug. Keep temperatures between 22-26°C.
- Transplant seedlings into their final container once they've developed 2-3 sets of true leaves. A 15-20 litre pot works well for indoor grows.
- Maintain an 18/6 light cycle during vegetative growth. The compact structure means you can flip to 12/12 after 3-4 weeks of veg without losing yield potential.
- Apply low-stress training during veg to open up the canopy and expose more bud sites to direct light.
- Switch to 12/12 to trigger flowering. Monitor humidity closely from week 5 onwards — aim for 45-50% RH maximum.
- Harvest when trichomes are mostly milky with some amber. Dry slowly at 18-20°C and 55-60% RH for 10-14 days, then cure in glass jars for at least 2 weeks.
Flavour, Aroma, and the Permanent Marker Experience
Crack open a cured jar of Permanent Marker and the first thing that hits you is sweetness — not fruity sweetness, but that dense, sugary candy-shop aroma. There's a floral layer underneath, almost like dried lavender mixed into a bag of sherbet lemons. It's distinctive enough that you'll recognise it blind after the first encounter.
The smoke (or vapour, if you're using a dry herb vaporiser) carries that same candy profile through to the exhale, with the floral notes becoming more pronounced on the backend. The resin production on these buds is genuinely impressive — your grinder will be caked after a single session, and the kief catch fills up fast.
With THC levels reaching up to 34%, Permanent Marker delivers a strong, uplifting effect that leans into social and creative territory. It's the kind of strain you reach for before a long conversation or a creative session, not the one that pins you to the sofa. That said, at this potency level, less experienced consumers should approach with respect. Start small.
According to research published in PMC, delta-9-THC acts as a partial agonist of both CB1 and CB2 receptors, producing a range of physiological effects (PMC5665515). The entourage effect — where cannabinoids and terpenes work in combination — may also play a role in the overall experience, as discussed in a 2025 review of cannabis medicinal products (PMC11870048).
Growing Permanent Marker indoors? Pair these seeds with a complete grow tent kit to get your setup dialled in from day one. A carbon filter is non-negotiable with a strain this aromatic — your neighbours will thank you. For outdoor growers, consider picking up fabric pots for better root aeration and drainage.
Permanent Marker vs Other High-THC Strains
At 34% THC, Permanent Marker sits in the upper tier alongside strains like Gorilla Glue and Bruce Banner. The difference is in the growth characteristics and flavour profile. Where Gorilla Glue tends to stretch tall and needs aggressive training, Permanent Marker stays compact and manageable. The candy-sweet terpene profile also sets it apart from the diesel and pine flavours that dominate many other high-THC options.
Compared to other Blimburn Seeds offerings, Permanent Marker is one of their most resinous and potent releases. If you've grown their Jealousy or Biscotti cuts before, you'll recognise elements of both parents, but the Sherb Bx influence adds a creaminess to the flavour that neither parent delivers alone.
| Attribute | Permanent Marker | Gorilla Glue #4 | Jealousy |
|---|---|---|---|
| THC | Up to 34% | Up to 30% | Up to 30% |
| Flowering Time | 8-10 weeks | 8-9 weeks | 8-9 weeks |
| Indoor Yield | Up to 550 g/m2 | Up to 500 g/m2 | Up to 500 g/m2 |
| Plant Height | Compact | Medium-tall | Medium |
| Dominant Flavour | Sweet candy, floral | Diesel, pine | Gassy, sweet |
| Pest Resistance | High | Moderate | Moderate |
Frequently Asked Questions
Is Permanent Marker suitable for beginner growers?
Yes, the compact growth habit and strong pest resistance make Permanent Marker manageable for newer growers. The main thing to watch is humidity during late flowering — those dense, resinous buds can trap moisture. Keep your RH below 50% in the final weeks and you'll be fine.
How long does Permanent Marker take to flower indoors?
Expect 8-10 weeks of flowering indoors. Most phenotypes finish closer to the 9-week mark. Watch the trichomes with a jeweller's loupe — harvest when they're mostly milky with around 10-20% amber for the best balance of potency and flavour.
What yield can I expect from Permanent Marker seeds?
Indoors, up to 550 g/m2 under optimised conditions with proper training. Outdoors in a warm climate, plants can produce up to 850 g/plant. Actual yields depend on your setup, light intensity, and growing experience.
How strong is Permanent Marker compared to other strains?
At up to 34% THC, it's among the most potent feminized strains on the market. For context, most commercial cannabis tests between 15-25% THC. If you're used to mid-range strains, approach Permanent Marker with a lighter hand.
What does Permanent Marker taste like?
Sweet and candy-like, with a light floral finish. Think sherbet sweets more than fruit. The flavour is consistent whether you smoke or vaporise, though a dry herb vaporiser at around 185-195°C tends to bring out the floral notes more clearly.
Can I grow Permanent Marker outdoors in northern Europe?
It's possible, but you'll need a warm, sheltered spot and a dry autumn. Outdoor harvest falls around mid-October, which can be risky in northern climates with early rain. A greenhouse or polytunnel extends your season and protects against late-season moisture.
How many seeds come in a pack of Permanent Marker?
Each pack contains 3 feminized seeds. All seeds are photoperiod, meaning you'll need to switch your light cycle to 12/12 to initiate flowering.
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.