How to Grow Grizzly Purple Auto
Grizzly Purple Auto is the easy, colorful autoflower that still fills a jar. It is an 80% indica autoflowering strain built from Critical Auto, Purple Afghani, and ruderalis, and it runs its whole life in just 8-10 weeks from seed. At a gentle 9-13% THC, deep purple buds, and a surprisingly big outdoor yield, the Grizzly Purple Auto is made for growers who want a fast, forgiving plant with real bag appeal rather than knockout potency.
This guide covers the full cycle for Grizzly Purple Auto feminized seeds from Blimburn Seeds, from germination to the cure, with every figure taken from the official datasheet. Note this is the autoflower version, distinct from the photoperiod Grizzly Purple Kush.
Recommended Strains
Grizzly Purple Auto
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THC | 9% - 13% (Low) |
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Type | Autoflowering |
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Yield | Medium |
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Phenotype | 80% Indica / 20% Sativa |
Grizzly Purple Kush
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THC | 15% - 20% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 70% Indica / 30% Sativa |
Grizzly Purple Auto at a Glance
The official numbers first:
| Trait | Grizzly Purple Auto |
|---|---|
| Lineage | Critical Auto x Purple Afghani x Ruderalis |
| Type | Autoflowering feminized |
| Phenotype | 80% Indica / 20% Sativa |
| THC | 9-13% (low) |
| Life cycle | 8-10 weeks (seed to harvest) |
| Height | 4.92 ft (1.5 m) |
| Yield indoor | 1.15-1.31 oz/ft² (350-400 g/m²) |
| Yield outdoor | 21.16-24.69 oz (600-700 g) per plant |
| Harvest | All season |
| Climate | Dry |
| Effects | Happy, relaxed, talkative |
| Flavors | Citrus, fruity, lemon |
The interesting combination here is low THC with a high outdoor yield. At 9-13% this is a mild, easygoing strain, but the Critical genetics push outdoor plants to a hefty 21.16-24.69 oz each, large for an autoflower. The Grizzly Purple Auto is less about potency and more about an easy grow, a quick turnaround, and a lot of purple flower.
Promos & Deals
The Critical and Purple Afghani Parents of Grizzly Purple Auto
Critical Auto is the yield engine. A fast, heavy-producing autoflower in its own right, it gives Grizzly Purple Auto the speed, the generous harvest, and the vigorous, sturdy structure that lets the plant reach a full 4.92 ft in a single short cycle.
Purple Afghani brings the looks and the calm. A pure Afghan indica, it contributes the deep purple coloration that gives the strain its name, the dense, resinous bud shape, and the relaxed, physically settling side of the effect. The ruderalis in the mix is what makes the whole thing automatic, flowering by age rather than light schedule.
Together they place Grizzly Purple Auto among the easiest of Blimburn’s autoflowering seeds, and its gentle potency makes it a natural fit in the low THC seeds for growers who prefer a mild, functional experience.
Germinating and Growing Grizzly Purple Auto
Germinate with the paper-towel method at 70-79°F, then handle the seedling as little as possible. Autoflowers run on a fixed internal clock and do not recover from transplant shock the way photoperiod plants do, so plant each seed straight into its final 3-5 gallon container, taproot down and half an inch deep.
Run 18-20 hours of light a day from the moment it sprouts, and keep that same schedule for the entire life cycle; there is no vegetative-to-flower switch to make. Growth is quick and vigorous, and because the plant reaches 4.92 ft, taller than most autos, give it a roomy pot and headroom from the start.
Keep training gentle. Low-stress training, tying branches down early, works well, but skip topping and heavy defoliation, since the short auto life cycle leaves no time to recover from hard stress. The goal is steady, uninterrupted growth from seed to harvest.
Growing Grizzly Purple Auto Indoors
Indoors, the routine is refreshingly simple: an 18/6 or 20/4 light schedule held steady from sprout to harvest. Grizzly Purple Auto starts flowering on its own around weeks three to four and finishes the full run in 8-10 weeks, so a continuous, same-size harvest is easy to plan.
Hold temperatures at 68-80°F and keep humidity on the low side, around 50-55% early and 35-45% in flower, in line with the strain’s preference for a dry climate. Good airflow and low humidity bring out the purple and keep the dense buds clean. Indoor yield lands at 1.15-1.31 oz/ft² (350-400 g/m²).
Growing Grizzly Purple Auto Outdoors
Outdoors is where the yield shines. Because it is an autoflower, Grizzly Purple Auto is an all-season plant: you can start a run almost any time the weather is warm, and in a long season you can fit more than one harvest into a year. Each plant can return a large 21.16-24.69 oz (600-700 g) of dried flower.
It strongly prefers a dry climate, which makes it a standout for the arid and semi-arid United States, places like Arizona, New Mexico, inland Southern California, and the high desert of Colorado, where low humidity suits it and mold pressure is minimal. Give full sun and a large pot or open ground, go easy on watering in dry heat, and the deep purple buds will color up well as cooler nights arrive.
Flowering and Buds of Grizzly Purple Auto
Flowering begins automatically, usually around week three to four from germination, with no change to the light schedule. From there the plant forms dense, chunky indica buds that fatten over the back half of the 8-10 week cycle and take on the rich purple and violet tones that give the strain its name, deepening most where nights run cool.
Resin coverage is moderate rather than extreme, in keeping with the gentle 9-13% THC, but the color more than makes up for it. Keep humidity low and airflow steady through these weeks; the dense, purple-tinged flowers look their best and stay cleanest in the dry conditions this strain was bred for.
Common Problems and Pro Tips
The golden rule with any autoflower applies doubly here: do not stress the plant. With only 8-10 weeks from seed to harvest, there is no time to bounce back from a rough transplant, heavy topping, or a nutrient overdose. Plant in the final pot, train only gently, and keep the environment stable and uninterrupted.
The other watch point is the dry-climate preference. In humid conditions the dense purple buds can hold moisture and risk rot, so keep flowering humidity low and airflow constant. Expert tip: because this is a low-THC, high-color, all-season auto, treat it as a perpetual-harvest plant. Staggering plantings every few weeks gives a steady supply of mild, easy-smoking purple flower without a single calendar deadline.
Feeding and Watering
Autoflowers feed lightly, and Grizzly Purple Auto is no exception. Keep nutrient strength well below photoperiod levels and build up slowly; overfeeding is the most common mistake on a plant this fast.
| Stage | EC | pH | Notes |
|---|---|---|---|
| Seedling | 0.4-0.6 | 6.0-6.5 | Plain water or quarter-strength feed |
| Early growth | 0.6-1.0 | 6.0-6.5 | Light nitrogen, add silica for stems |
| Early flower | 1.0-1.2 | 6.0-6.5 | Ease into bloom nutrients as pistils show |
| Peak bloom | 1.2-1.4 | 6.0-6.5 | Phosphorus and potassium, kept moderate |
| Flush | 0.0-0.4 | 6.0-6.5 | Final 7-10 days, plain water |
Water when the top inch of the medium dries, and err on the drier side given the strain’s arid preference and the risk of overwatering a young auto. Let the pot lighten clearly between rounds, and watch for signs of overfeeding rather than hunger on such a short, light-feeding plant.
Finish with 7-10 days of plain water at EC 0.0-0.4. The citrus, fruity, lemon profile is light and bright, and a clean flush keeps it from being buried under leftover nutrients.
Flavor, Terpenes, and Effects of Grizzly Purple Auto
The flavor is bright and fruity: a lemon-citrus lift over a soft, fruity base. The terpene profile is broad, with a handful doing most of the work. Myrcene lays the ripe, fruity foundation, terpinolene and pinene add the fresh, zesty brightness behind the citrus, and caryophyllene brings a light peppery warmth. Linalool softens it with a floral note and bisabolol adds a gentle, almost chamomile smoothness, with farnesene, humulene and more rounding out the base.
The effect is mild and sociable, true to the low 9-13% THC. It opens happy and talkative, easygoing and clear rather than overwhelming, then the Purple Afghani side brings a relaxed, physically settled calm. This is a daytime-friendly, low-ceiling strain, which, together with its simple autoflower grow, is exactly why the datasheet marks Grizzly Purple Auto suitable for beginners.
Harvesting, Drying, and Curing
Check trichomes from around week seven. Harvest when most are cloudy with a little amber for the balanced happy-to-relaxed effect; with a low-THC strain there is little reason to push deep into amber. The purple color is a visual bonus, but trichomes, not bud color, tell you when it is ready.
Dry whole branches at 59-68°F and 50-55% humidity for 7-14 days in darkness with gentle airflow, waiting for stems that snap. Cure in glass for at least three weeks, burping daily early on; the bright citrus-lemon profile sharpens and the smoke smooths out with a patient cure, even on a mild strain like this.
What to Do With Your Trim
Even a gentle strain leaves usable trim, and the big yield means there is plenty of it. Dry-sift the sugar leaves for a light, citrusy kief, run ice-water bags for hash, or save the trim for edibles, where the mild potency makes for an easy, controllable dose. Little needs to go to waste.
Frequently Asked Questions
Is Grizzly Purple Auto an autoflower?
Yes. Grizzly Purple Auto is an autoflowering strain, thanks to the ruderalis in its Critical Auto x Purple Afghani lineage. It flowers automatically by age rather than light schedule and runs its full cycle in 8-10 weeks, unlike the photoperiod Grizzly Purple Kush.
What light schedule does Grizzly Purple Auto need?
Grizzly Purple Auto wants 18-20 hours of light a day, held steady from sprout to harvest. Because it is an autoflower, there is no switch to 12/12; the same long-day schedule carries it through its entire 8-10 week life cycle, indoors or under the sun outdoors.
What is the THC level of the Grizzly Purple Auto strain?
The official range is 9-13%, a low level for Grizzly Purple Auto. It gives a mild, easygoing, clear-headed experience rather than a strong high, which makes it a gentle option and part of why the datasheet lists it as suitable for beginners.
How long does Grizzly Purple Auto take from seed to harvest?
Grizzly Purple Auto finishes in 8-10 weeks from germination, flowering on its own around weeks three to four. As an all-season autoflower it can be started almost any warm time of year, and a long season allows more than one harvest.
How much does Grizzly Purple Auto yield?
Yields are generous for an autoflower. Indoors Grizzly Purple Auto returns 1.15-1.31 oz/ft² (350-400 g/m²), while a single outdoor plant can produce a large 21.16-24.69 oz (600-700 g), driven by its Critical genetics and tall 4.92 ft frame, big numbers for any autoflowering plant.
Why is Grizzly Purple Auto purple?
The purple comes from its Purple Afghani parent, which carries pigments called anthocyanins that show as violet and purple tones. The color deepens most when nights turn cool late in the Grizzly Purple Auto flowering cycle, though trichomes still decide ripeness.
