Auto Purple
Cannabis seeds
by Pyramid Seeds
Auto Purple Autoflowering Cannabis Seeds by Pyramid Seeds
Auto Purple is an autoflowering feminised cannabis seed from Pyramid Seeds that delivers genuinely purple buds — not just purple leaves — on a compact, fast-finishing plant. Bred from a cross of Purple and Ruderalis genetics by L'Hort Dels Somnis and Pyramid Seeds, this 65% Sativa / 25% Ruderalis / 10% Indica hybrid stays between 50 and 120cm tall and finishes in 8 to 10 weeks from germination. With a CBD content of 1.5%, she's one of the more interesting autoflowers for growers who want something beyond pure THC.
Why Grow Auto Purple Seeds?
Most strains with "purple" in the name disappoint in the same way: the fan leaves turn a bit violet, maybe a sugar leaf or two goes dark, but the actual buds stay green. Auto Purple is different. The purple pigmentation develops in the buds themselves, which makes for a genuinely striking harvest. We've seen photos from customers who couldn't believe these came from autoflowering seeds — the colour is that vivid.
The genetics here are 65% Sativa, 25% Ruderalis, and 10% Indica. Despite the Sativa dominance, the Ruderalis influence keeps her short and manageable. You're looking at 50 to 120cm depending on pot size and conditions, which makes Auto Purple a solid pick for guerrilla grows, balcony setups, or any situation where you need discretion. She won't tower over your fence.
The honest limitation? THC levels aren't going to blow anyone's socks off. This isn't your go-to if you're chasing maximum potency. But the 1.5% CBD content is notably higher than most autoflowers, and according to research published in PMC (2023), CBD-rich cannabis varieties have shown measurable blood cannabinoid levels in preliminary clinical trials, suggesting that even moderate CBD percentages can be physiologically relevant (PMC12066606). If you're growing for flavour, bag appeal, and a balanced cannabinoid profile rather than raw strength, Auto Purple delivers.
Auto Purple Grow Specs and Yield Potential
| Spec | Value |
|---|---|
| Seed Bank | Pyramid Seeds |
| Genetics | Purple x Ruderalis |
| Type | Autoflowering Feminised |
| Sativa / Indica / Ruderalis | 65% / 10% / 25% |
| CBD Content | 1.5% |
| Height | 50-120cm |
| Indoor Yield | Up to 550g/m2 |
| Outdoor Yield | Up to 200g per plant |
| Seed to Harvest | 8-10 weeks |
| Seeds per Pack | 5 |
Those indoor numbers — up to 550g/m2 — are genuinely impressive for an autoflower. She performs well in both SOG and ScrOG setups, which gives you flexibility regardless of your grow space. The 8-to-10-week total cycle from germination to harvest means you can potentially squeeze in multiple runs per season if you're growing indoors under 18/6 or 20/4 lighting.
How to Grow Auto Purple Cannabis Seeds
Auto Purple is a forgiving strain, but a few details make the difference between a decent harvest and a great one. Here's what we'd do:
- Germinate your seeds using the paper towel method or directly in a starter plug. Tap roots typically appear within 24-72 hours.
- For outdoor grows, plant directly into the final container — either in-ground soil or a 20-litre pot minimum. Autoflowers don't respond well to transplanting because the stress costs precious days from a fixed vegetative window. Bigger root system means bigger plants, and 200 grams per plant is achievable outdoors with enough root space.
- For indoor grows, use a light, airy growing medium. Coco-perlite mixes work brilliantly. Keep your light cycle at 18/6 or 20/4 from start to finish — autoflowers don't need a light change to trigger flowering.
- Start with light feeding. Autoflowers burn easily, especially in the first two weeks. Quarter-strength nutrients until the third node set, then gradually increase.
- Watch for the purple colouration to develop during late flowering. Cooler night temperatures (around 15-18°C) during the final two weeks can intensify the purple pigmentation in the buds, though Auto Purple will show colour regardless — it's genetic, not just a cold-stress response.
- Harvest when 70-80% of trichomes are milky with some amber. The sweet liquorice aroma will be unmistakable at this stage.
Auto Purple Flavour and Aroma Profile
This is where Auto Purple really earns its place in the seed catalogue. The fully matured plants put out a sweet, unmistakable scent of black liquorice — rich and almost confectionery-like. Crack open a dried bud and you'll notice it immediately. The smoke itself shifts into grape juice and mixed berry territory, smooth and fruity without the harshness you sometimes get from autoflowers that have been rushed to market.
If you've grown Dutch Passion's Purple #1 or similar heritage purple strains, the flavour profile sits in the same family but with a sweeter, less earthy character. The berry notes are more pronounced, the liquorice more distinct. It's the kind of smoke that actually tastes like something, which isn't always a given with autos.
According to research on anthocyanin biosynthesis in purple cannabis varieties (PMC, 2023), the purple colouration in Cannabis sativa is linked to specific flavonoid compounds — the same class of molecules responsible for colour in blueberries and grapes — which may contribute to the distinctive flavour profile of purple cultivars (PMC10376404).
Auto Purple vs Other Purple Autoflowers
We get asked about purple autos fairly often, so here's how Auto Purple stacks up against two common alternatives:
| Strain | Genetics | Height | Yield (Indoor) | Cycle | Purple Location |
|---|---|---|---|---|---|
| Auto Purple (Pyramid Seeds) | 65% Sativa / 10% Indica / 25% Ruderalis | 50-120cm | Up to 550g/m2 | 8-10 weeks | Buds |
| Auto Blackberry Kush (Dutch Passion) | Indica-dominant auto | 50-100cm | 400-500g/m2 | 10-11 weeks | Buds and leaves |
| Purple #1 (Dutch Passion) | Photoperiod (not auto) | Up to 150cm+ | Varies | 8 weeks flowering | Buds up to 50cm long |
The key differentiator for Auto Purple is the combination of Sativa-dominant genetics in a compact autoflowering package with genuine bud-level purple colouration. Auto Blackberry Kush from Dutch Passion is an excellent strain in its own right, but it leans Indica-heavy and takes a week or two longer. Purple #1 is a photoperiod strain — brilliant if you have the setup for light cycle control, but not an option if you need the simplicity of autoflowering genetics.
We'd pick Auto Purple if you want the fastest turnaround with the most dramatic colour payoff in the actual flower. The 550g/m2 ceiling is also the highest of the three for indoor growers.
Who Should Grow Auto Purple?
Start with this strain if you want something visually spectacular without the complexity of photoperiod growing. Auto Purple is a good match for growers working with limited vertical space — a 120cm tent handles her comfortably. The SOG and ScrOG compatibility means you can pack plants in and maximise your canopy coverage.
The 1.5% CBD level also makes her interesting for growers focused on a more balanced cannabinoid profile. According to research into phytocannabinoid pharmacology (PMC, 2023), CBD has demonstrated anti-inflammatory properties in preclinical models, and strains with measurable CBD content may offer a different experience profile compared to THC-only varieties (PMC10658372).
The one caveat: if maximum THC potency is your primary goal, look elsewhere. Auto Purple trades some punch for flavour, aesthetics, and CBD content. That's a trade-off we'd happily make, but it's worth knowing upfront.
Complete your setup with a propagation kit for reliable germination, and consider a carbon filter if you're growing indoors — that liquorice aroma is lovely, but your neighbours might have questions. A 20-litre fabric pot is the sweet spot for outdoor Auto Purple grows where you want to hit that 200g-per-plant ceiling.
Frequently Asked Questions
Does Auto Purple actually turn purple, or is it just the leaves?
The buds themselves develop purple colouration, not just the foliage. This sets Auto Purple apart from many strains that only show purple on fan leaves or sugar leaves. Cooler night temperatures in late flowering can intensify the colour, but the purple genetics express regardless of temperature.
How long does Auto Purple take from seed to harvest?
8 to 10 weeks from germination to harvest. That's the full cycle — no separate vegetative and flowering phases to manage. Under 20/4 lighting indoors, most growers report finishing closer to the 9-week mark.
Is Auto Purple good for beginners?
Yes. The autoflowering genetics mean no light cycle changes, the compact height stays manageable, and the plant is forgiving of minor feeding errors. Plant directly into your final pot to avoid transplant stress and you're most of the way there.
What yield can I expect from Auto Purple outdoors?
Up to 200 grams per plant when grown in soil or a 20-litre pot with a well-developed root system. Smaller containers will limit root growth and reduce yield proportionally. Direct-sow into the final container for best results.
Can I grow Auto Purple in a SOG or ScrOG setup?
Auto Purple performs well in both SOG and ScrOG configurations. The compact height of 50-120cm and Sativa-leaning structure make her responsive to canopy training. Indoor yields of up to 550g/m2 are achievable with proper light coverage and plant density.
What does Auto Purple smell and taste like?
The mature plants produce a sweet black liquorice aroma. The smoke tastes of grape juice and mixed berries — smooth, fruity, and distinctly different from the earthy profiles of most autoflowers. It's one of the more flavourful autos we carry.
Is the 1.5% CBD content significant?
For an autoflower, 1.5% CBD is notably above average. Most autoflowering strains contain trace CBD at best. According to preliminary clinical research, even moderate CBD levels produce measurable blood cannabinoid concentrations (PMC12066606), suggesting the 1.5% is physiologically relevant rather than negligible.
Last updated: April 2026
Related products
You might also like
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.