Sir Jack Auto Pure CBD
Cannabis seeds
by Exotic Seeds
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Sir Jack Auto Pure CBD Cannabis Seeds
Sir Jack Auto Pure CBD is a feminised autoflowering cannabis seed from Exotic Seeds that delivers around 6% CBD with less than 1% THC — all the flavour of a proper Haze, none of the high. She finishes in just 9 weeks from germination, stays compact at 85–90cm, and yields up to 450g/m² indoors. If you want to grow your own CBD flower without fussing over light schedules or clearing your afternoon, this is where you start.
Why Grow a Pure CBD Autoflower?
Most cannabis seeds are bred for THC. Sir Jack Auto Pure CBD goes the other direction — Exotic Seeds specifically developed this strain for people who enjoy the ritual of growing, drying, and smoking or vaping cannabis but don't want the psychoactive effects. With THC under 1%, there's no head change. You get the terpene profile, the aromatics, the act of rolling or packing a bowl — just without the couch lock.
The 6% CBD content makes the harvested flower genuinely useful beyond flavour alone. CBD is traditionally used as a calming botanical, and a growing body of research continues to investigate its properties. The point here: you're not growing decorative hemp. You're growing flower with a purpose.
We'd pick this over buying pre-made CBD flower for one simple reason — freshness. Home-grown, properly cured CBD bud tastes better and smells better than anything that's been sitting in packaging for months. And at 9 weeks from seed to chop, you're not waiting long.
Sir Jack Auto Pure CBD Grow Specs and Performance
She's an autoflower, so no light-cycle switching required. Set your timer to 18/6 or 20/4 and leave it. The plant stays between 85 and 90cm tall on average, which makes her a solid pick for tents, balconies, or any space where height is limited. Here's the full breakdown:
| Specification | Detail |
|---|---|
| Seed bank | Exotic Seeds |
| Seed type | Feminised autoflower |
| THC content | Less than 1% |
| CBD content | Approximately 6% |
| Average height | 85–90cm |
| Seed-to-harvest time | 9 weeks from germination |
| Indoor yield | 400–450g/m² (optimal conditions) |
| Light cycle | No switch needed (autoflowering) |
| Seeds per pack | 3 |
| Aroma profile | Woody, citrus, hash, incense |
That 400–450g/m² figure is under optimal indoor conditions — good lighting, proper nutrients, stable environment. In a basic setup with less-than-ideal ventilation, expect something closer to 300–350g/m². Still very respectable for a 9-week autoflower that tops out under a metre.
Aroma and Flavour: Haze Without the Haze
This is where Sir Jack Auto Pure CBD genuinely surprises. The terpene profile reads like a classic Haze: woody base notes layered with sharp citrus, a hint of old-school hash, and a wisp of incense that lingers on the exhale. If you've ever cracked open a jar of Amnesia Haze or Super Silver Haze and thought "I love this smell but I don't want to be horizontal for four hours" — this is your strain.
The flavour holds up whether you smoke or vape. Through a dry herb vaporiser at around 180–190°C, the citrus and incense notes come through cleanest. Rolled in a joint, the woody hash character dominates. Either way, it smells and tastes like proper cannabis — not like the bland, grassy hemp flower you sometimes find in CBD shops.
One honest note: the bag appeal won't match a high-THC strain. The buds tend to be slightly less resinous than their THC-heavy cousins. You'll still see trichomes, but don't expect the frost of a photoperiod OG Kush. The trade-off is worth it for the flavour-to-function ratio.
How to Grow Sir Jack Auto Pure CBD
- Germinate your seeds using the paper towel method or directly in a small pot of moist, light soil mix. Taproots typically appear within 24–72 hours.
- Transplant seedlings into their final container early — autoflowers don't love being repotted. A 7–11 litre fabric pot works well for this strain's compact size.
- Set your indoor light schedule to 18 hours on, 6 hours off. Some growers run 20/4 for autoflowers; either works. No need to switch to 12/12 at any point.
- Feed lightly during the first 2–3 weeks. Autoflowers are sensitive to overfeeding, and Sir Jack Auto Pure CBD is no exception. Start at half the manufacturer's recommended nutrient dose and increase gradually.
- Watch for pre-flowers around week 3–4. Once flowering begins, switch to a bloom nutrient with higher phosphorus and potassium.
- Maintain humidity around 40–50% during flowering to prevent mould. At 85–90cm, the canopy stays manageable, but good airflow is still critical.
- Harvest at approximately 9 weeks from germination. Check trichomes with a loupe — you're looking for mostly milky with some amber. With a CBD strain, erring slightly later tends to maximise cannabinoid content.
- Dry in a dark, ventilated space at 18–20°C for 7–10 days, then cure in glass jars for at least 2 weeks. Proper curing makes a massive difference to the flavour profile.
Who Is Sir Jack Auto Pure CBD Best For?
This strain fills a specific gap. If you grow cannabis but want something you can use during the day — while working, socialising, or just unwinding without any psychoactive effect — Sir Jack Auto Pure CBD is the best autoflowering CBD seed for daytime use in the Exotic Seeds catalogue. The sub-1% THC means there's genuinely nothing to manage.
It's also a smart pick if you're growing alongside high-THC plants and want a CBD option in rotation. The 9-week turnaround means you can squeeze in multiple harvests per season outdoors, or run perpetual cycles indoors without tying up tent space for months.
Where it's less suited: if you're after high-potency CBD flower in the 15–20% range, this isn't it. At 6% CBD, Sir Jack Auto Pure CBD sits in the moderate range. For concentrated CBD effects, you'd need to consume more flower per session or consider processing it into an extract. But for a pleasant smoke or vape with a gentle, relaxing character, 6% does the job nicely.
Complete your CBD grow setup with a Dark Box grow tent for light-tight cultivation and a carbon filter to keep the Haze-like aroma contained. If you're planning to vape your harvest, pair it with a dry herb vaporiser — lower temperatures bring out Sir Jack's citrus and incense terpenes beautifully.
Sir Jack Auto Pure CBD vs Other CBD Seeds
Exotic Seeds isn't the only seed bank doing CBD autoflowers, so here's how Sir Jack stacks up against two other popular options we carry:
| Strain | CBD | THC | Seed-to-harvest | Indoor yield | Flavour profile |
|---|---|---|---|---|---|
| Sir Jack Auto Pure CBD (Exotic Seeds) | 6% | Less than 1% | 9 weeks | 400–450g/m² | Woody, citrus, hash, incense |
| CBD Auto Charlotte's Angel (Dutch Passion) | Up to 15% | Less than 1% | 10–11 weeks | 400–500g/m² | Pine, citrus, earthy |
| CBD Auto Compassion Lime (Dutch Passion) | Up to 11% | Less than 1% | 10–11 weeks | 350–450g/m² | Lime, sweet, herbal |
Sir Jack's advantage is speed — 9 weeks flat versus 10–11 for the Dutch Passion options. If you're optimising for multiple harvests per year or just want results fast, that 1–2 week difference adds up. The trade-off is a lower CBD percentage. Charlotte's Angel pushes up to 15% CBD, which is substantially more potent per gram. If maximum CBD concentration matters to you, Charlotte's Angel is the stronger pick. If you're after Haze-style flavour and quick turnaround, Sir Jack wins.
Frequently Asked Questions
Will Sir Jack Auto Pure CBD get me high?
No. With THC levels under 1%, there is no psychoactive effect. You'll taste and smell proper cannabis, but there's no head change or body load. You can use it throughout the day without impairment.
How much CBD flower does one Sir Jack Auto Pure CBD plant produce?
Indoors under optimal conditions, expect 400–450g/m². A single plant in a 7–11 litre pot typically yields between 40–80g dried, depending on your setup and experience level.
Can I grow Sir Jack Auto Pure CBD outdoors?
Yes. As an autoflower, she doesn't depend on light-cycle changes to trigger flowering. She'll perform outdoors in most European climates from late spring through summer. The compact 85–90cm height keeps her discreet on a balcony or in a small garden.
Do I need to change the light cycle for this autoflower?
No. Autoflowering genetics mean Sir Jack Auto Pure CBD flowers automatically regardless of light schedule. Most growers run 18/6 or 20/4 from seed to harvest. No 12/12 switch required.
Is 6% CBD considered high for a cannabis strain?
It's moderate. Some CBD-specific photoperiod strains reach 15–20% CBD. At 6%, Sir Jack Auto Pure CBD provides a noticeable but gentle effect. If you need higher concentrations, you can process the flower into a homemade extract or look at strains like Charlotte's Angel.
How many seeds come in a pack of Sir Jack Auto Pure CBD?
Each pack contains 3 feminised autoflowering seeds. All seeds are female, so no need to identify and remove males during the grow.
What does Sir Jack Auto Pure CBD smell like?
Classic Haze aromatics — woody base with citrus brightness, a hash-like undertone, and traces of incense. It smells like proper cannabis, not bland hemp. A carbon filter is recommended for indoor grows if discretion matters.
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.