Purplematic CBD Autoflower
Cannabis seeds
by Royal Queen Seeds
Purplematic CBD Autoflower Seeds — High-CBD Purple Cannabis
Purplematic CBD autoflower is a feminised cannabis seed from Royal Queen Seeds that produces CBD-rich, deep purple flowers with minimal THC. Bred from Kush Rose Auto CBD and Afghan Rose Auto CBD, she delivers up to 17% CBD in a compact, beginner-friendly autoflowering package that finishes in roughly 8–9 weeks from seed. The 90% indica genetics show in the bushy structure and the earthy, slightly sweet aroma that fills your drying room.
This guide is written for adults aged 18 and over.
Pack Sizes
| Pack | Seeds | SKU |
|---|---|---|
| Single | 1 seed | CSRQ0372 |
| Small | 3 seeds | CSRQ0373 |
| Medium | 5 seeds | CSRQ0374 |
| Large | 10 seeds | CSRQ0375 |
Starting with 3 seeds gives you a safety margin — even experienced growers occasionally lose a seedling to damping off or user error. If you're filling a 1m² tent with 12 plants in 7-litre pots, grab the 10-pack.
Genetics and Lineage of Purplematic CBD
Purplematic CBD descends from two proven CBD autoflowering parents: Kush Rose Auto CBD and Afghan Rose Auto CBD. Both carry Afghan indica genetics — short internodes, broad leaves, dense resin production — combined with ruderalis for automatic flowering regardless of light schedule. The resulting offspring is 90% indica, 5% sativa, and 5% ruderalis.
What makes this cross interesting is the stacking of CBD-dominant traits from both sides. Neither parent produces significant THC, so the offspring reliably tests below 0.5% THC while pushing CBD into the 17% range. The purple colouration isn't just cosmetic either — it comes from anthocyanin pigments that express more strongly when night temperatures drop below 15°C during flowering. You'll see the colour shift regardless, but cooler nights make it dramatic.
Growing Purplematic CBD Autoflower Seeds
Purplematic CBD is one of the more forgiving autoflowers we've come across. She tolerates minor pH swings, inconsistent watering, and the kind of rookie mistakes that would stunt a photoperiod plant. That said, she rewards good practice with significantly better yields.
Indoor growing: Expect plants between 70–120 cm tall. Under a 20/4 light cycle with decent LED coverage, you're looking at up to 450 g/m² when running 12 plants per square metre in 7-litre fabric pots. She responds well to low-stress training (LST) — tie down the main stem early and you'll open up the canopy for more even light penetration across secondary bud sites.
Outdoor growing: Plants peak at around 100–150 g per plant depending on your climate and soil quality. She does well in temperate European climates and finishes before autumn rains become a problem — a genuine advantage over photoperiod strains that stretch into October.
The honest limitation: Because she's an autoflower, you can't extend vegetative growth to fill a larger space. If you top her too aggressively or stress her during the first three weeks, she won't have time to recover before flowering kicks in automatically. Keep training gentle and early.
| Specification | Detail |
|---|---|
| Seed Bank | Royal Queen Seeds |
| Genetics | Kush Rose Auto CBD x Afghan Rose Auto CBD |
| Type | Autoflowering, Feminised |
| Indica / Sativa / Ruderalis | 90% / 5% / 5% |
| CBD Content | Up to 17% |
| THC Content | Below 0.5% |
| Indoor Height | 70–120 cm |
| Indoor Yield | Up to 450 g/m² |
| Outdoor Yield | 100–150 g/plant |
| Flowering Time | 8–9 weeks (seed to harvest) |
| Difficulty | Beginner-friendly |
Complete your CBD grow setup with fabric pots (7-litre capacity works well for autoflowers in a 1m² tent) and a basic LST clip set for training. If you're after another CBD-dominant strain to compare, Tatanka Pure CBD from Royal Queen Seeds runs a similar profile with slightly different terpenes.
Why Grow Purplematic CBD Autoflower
Most growers chasing CBD end up with two problems: either the strain takes forever to finish (photoperiod CBD varieties can run 10–12 weeks of flowering alone), or the genetics aren't stable enough and you get THC-dominant phenotypes sneaking through. Purplematic CBD solves both.
The autoflowering trait means you're harvesting dried, cured CBD flower roughly 10–11 weeks after popping the seed. No light schedule changes, no sexing, no waiting for autumn. The feminised genetics eliminate male plants from the equation entirely. And because both parents are CBD-dominant, you're not gambling on phenotype expression — the offspring consistently produces high CBD with negligible THC.
From a sensory perspective, the dried flower smells earthy and slightly sweet — think damp forest floor with a hint of dried fruit. The purple colouration makes trimming genuinely pleasant to look at, which sounds trivial until you're three hours into a harvest session. The buds are dense, compact, and coated in visible trichomes that carry those CBD-rich resin heads.
According to a review in Cannabis and Cannabinoid Research, CBD demonstrates a favourable safety profile in clinical settings, with common side effects limited to somnolence, diarrhoea, and fatigue at high doses (Iffland & Grotenhermen, 2017 — PubMed ID: 28861514). Research into CBD's potential applications in neuropsychiatric disorders continues to expand (PubMed ID: 31601406), though we'd note that growing your own flower and smoking or vaporising it is a different delivery method than the oral capsules used in most clinical trials.
How to Grow Purplematic CBD Autoflower
- Germinate seeds using the paper towel method or directly in a starter plug. Taproot should appear within 24–72 hours.
- Plant the germinated seed 1 cm deep in a small pot (0.5 L) with light, airy seedling mix. Keep humidity at 65–70%.
- Transplant to a 7-litre fabric pot once the seedling has 3–4 sets of true leaves. Do this gently — autoflowers don't recover well from transplant shock, so handle the root ball carefully.
- Set your light schedule to 20 hours on, 4 hours off for the entire lifecycle. Autoflowers don't need a dark period to trigger flowering.
- Begin low-stress training (LST) once the plant has 5–6 nodes. Gently bend the main stem away from centre and secure with soft plant ties. This opens the canopy for better light distribution.
- Switch to bloom nutrients when you see the first pre-flowers (usually around week 3–4 from seed). Don't overfeed — autoflowers are sensitive to nutrient burn.
- Drop night temperatures to 15–18°C during the final 2 weeks of flowering to enhance purple colouration from anthocyanin expression.
- Harvest when trichomes are mostly cloudy with some amber. Dry in a dark room at 18–20°C and 55–60% humidity for 7–10 days, then cure in glass jars for at least 2 weeks.
CBD Dosage Context
Once you've harvested and cured your Purplematic CBD flower, dosing depends on your consumption method. New users often start at 10–20 mg CBD per session to gauge response, scaling gradually to 25–50 mg based on need. With flower testing around 17% CBD, a 0.1 g pinch in a dry herb vaporiser delivers roughly 10–15 mg of available CBD after accounting for bioavailability losses. Clinical studies have used substantially higher doses (up to 600 mg orally), but these involve pharmaceutical-grade isolates rather than whole-plant flower.
Frequently Asked Questions
Are Purplematic CBD seeds feminised?
Yes. All Purplematic CBD autoflower seeds from Royal Queen Seeds are feminised, meaning they produce female plants only. No need to identify and remove males during flowering.
How long does Purplematic CBD take from seed to harvest?
Roughly 8–9 weeks total. She begins flowering automatically around week 3–4 regardless of light schedule, with harvest-ready buds by week 8–9 from germination.
Will Purplematic CBD get me high?
No. With THC below 0.5%, there's no intoxicating effect. The high CBD content (up to 17%) provides the cannabinoid profile without psychoactive properties. You'll taste the terpenes and feel relaxed, but you won't be impaired.
Do the buds actually turn purple?
Yes — the purple colouration comes from anthocyanin pigments in the genetics. All phenotypes show some colour, but dropping night temperatures to 15–18°C during late flowering intensifies the effect significantly.
Can I grow Purplematic CBD outdoors in northern Europe?
Absolutely. The autoflowering trait and short lifecycle mean she finishes well before autumn weather sets in. Plant after the last frost (late May in most of northern Europe) and you'll harvest by mid-August.
What yield can I expect from a single plant?
Outdoors, expect 100–150 g of dried flower per plant. Indoors under optimal conditions with LST, individual plants can contribute to a collective yield of up to 450 g/m² when grown at density (12 plants per square metre).
Is Purplematic CBD suitable for first-time growers?
It's one of the best autoflowers for beginners. She tolerates minor mistakes, doesn't require light schedule changes, and finishes fast. The main thing to avoid is aggressive topping — stick to gentle LST and you'll be fine.
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.