How to Grow Purple Kush Auto
Purple Kush Auto is a compact, colourful indica autoflower that brings classic Purple Kush looks and flavour to a quick, hands-off grow. It pairs a comfortable 15–20% THC with a fruity, sweet flavour and a happy, relaxed, deeply soothing effect, on a small plant that practically grows itself.
Built from Purple Kush crossed with ruderalis, this is a 70% indica, 30% sativa strain with a reputation for dense, purple-tinged buds and a smooth, mellow high. The ruderalis side makes it autoflowering, so it blooms on its own schedule with no change in the light cycle, and stays short and discreet.
Recommended Strains
Purple Kush Autoflower
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THC | 15% - 20% (Medium) |
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Type | Autoflowering |
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Yield | Low |
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Phenotype | 70% Indica / 30% Sativa |
Purple Kush
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THC | 17% - 27% (High) |
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Type | Feminized |
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Yield | High |
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Phenotype | 70% Indica / 30% Sativa |
Because it is small, fast and forgiving, Purple Kush Auto is a great choice for beginners and for growers working in a tight or low-profile space. You can see the full genetics and buy Purple Kush Auto seeds on the strain page, and browse more of our autoflowering range alongside it.
Strain Profile at a Glance
| THC | 15–20% (medium) |
|---|---|
| Lineage | Purple Kush x Ruderalis |
| Type | Autoflowering |
| Genetics | 70% Indica / 30% Sativa |
| Climate | Temperate |
| Life cycle | 8–10 weeks from seed |
| Harvest | All season |
| Height | 3.28 ft / 1 m |
| Yield | Low |
| Yield indoor | 0.98 oz/ft² (300 g/m²) |
| Yield outdoor | 21.16 oz/plant (600 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Fruity, Sweet |
| Effects | Happy, Relaxed, Soothing |
Promos & Deals
Climate and Where to Grow It
Purple Kush Auto does well in a temperate climate with mild, steady conditions and plenty of light. It is a tough, adaptable plant that performs both outdoors and in a controlled indoor tent, staying very compact at around 1 m.
Because it is autoflowering, it does not wait for the seasons. You can plant it almost any time in a warm stretch and it will run its full cycle, which makes several harvests in a single year possible outdoors. Given room to stretch outdoors, a single plant can bring in a generous 600 g, while indoors its small frame produces a more modest 300 g/m², so give it the space and light it needs to make the most of each plant.
Indoors, aim for daytime temperatures around 68–80°F (20–27°C) and keep steady airflow through the canopy. Its tiny stature makes it a great fit for a cupboard-sized space or a micro-grow.
Growing Autoflowering Seeds
The big advantage of an autoflower is that it flowers on its own schedule rather than on a light change. Purple Kush Auto starts to bloom a few weeks from seed, regardless of the day length, and finishes the whole run in roughly 8–10 weeks. There is no need to switch the lights to a shorter day.
For the best results, give it plenty of light, 18–20 hours a day works well from start to finish, and start it in its final pot. Autoflowers have a short, fixed life, so transplanting sets them back and costs you growth you cannot get back, which matters even more with a small plant like this. Being a female-only autoflower, it also needs no sexing, so there are no males to spot or remove.
Feeding Schedule (EC Guide)
Autoflowers are small, fast plants that prefer a lighter touch than a big photoperiod strain, and this is one of the smaller ones, so keep the feed gentle. Start low, build up slowly as the plant grows, and taper off for the final flush so the fruity, sweet flavour stays clean.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Build the frame, raise nitrogen gradually |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while the buds swell |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Flowering and Harvest
With flowering starting a few weeks in, the whole plant is usually ready to cut 8–10 weeks from seed. The indica dominance shows in the structure: compact spacing, dense, resin-coated buds and a short, stout frame, often with the purple tones this lineage is known for.
Keep the canopy open so light and air reach the lower buds, and support any heavier colas if they start to lean. Harvest when most trichomes have turned cloudy with a few amber heads for the fullest expression, and run a short plain-water flush in the last week or two before you cut.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15–18°C) and 55–60% humidity for 7–14 days, until the thin stems snap rather than bend. A slow, even dry stops the dense buds staying damp in the middle while the outside dries out, which protects the sweet, fruity aroma and keeps the purple colour looking its best.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure brings the fruity sweetness forward over the earthy kush base and smooths the smoke, which is exactly what this colourful cross deserves.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. Purple Kush Auto is a frosty, resinous plant, so the trim is excellent for dry sift, bubble hash or rosin, giving you a bonus run of flavourful concentrate from material most growers throw away.
Flavor and Terpenes
Purple Kush Auto has a smooth flavour of sweet fruit over a soft, earthy kush base, the mellow, dessert-like character you expect from Purple Kush genetics. It is a rounded, moreish profile rather than a sharp or gassy one.
It carries a deep terpene stack. Six shape the aroma: myrcene anchors the sweet, fruity base; farnesene adds a soft, ripe sweetness; caryophyllene brings a gentle peppery warmth; humulene deepens the earthy, woody side; eugenol layers in a warm, sweet-spice touch; and borneol grounds it with an earthy, camphor-like note. A supporting cast of cedrene, pinene, camphene and fenchol fills in the background.
Effects and Best Use
With its 70% indica base, Purple Kush Auto is reported as happy, relaxed and deeply soothing, a warm, mellow character that settles in comfortably toward the end of the day. It is a gentle, full-bodied profile best suited to the evening and quiet downtime.
At a medium 15–20% THC it is approachable rather than overwhelming, which suits its beginner-friendly nature. That easygoing potency, the small size, the fast cycle and the sweet, purple-tinged buds make it a genuinely rewarding grow, especially for a discreet setup.
Common Problems and Pro Tips
Purple Kush Auto is a small, forgiving grow, but it is a dense, purple-tinged indica auto, so plan for training, colour and airflow.
- Train gently, not hard: as an autoflower it will not recover from heavy topping, so use low-stress bending while young and start it in its final pot.
- Use cool nights for colour: its Purple Kush heritage turns the buds purple when late-flower nights run cool, so a slight temperature drop brings out that colour.
- Watch the humidity: as a 70% indica its buds are dense and trap moisture, so keep flowering humidity down and run a fan to prevent bud rot.
Expert tip: it stays small at around 1 m, ideal for a compact space, so good light and an open canopy get the most from it. A slow cure keeps its sweet fruit over a soft, earthy kush base at its best.
Frequently Asked Questions
Is Purple Kush Auto indica or sativa?
It is strongly indica-dominant, at 70% indica and 30% sativa, which shows in its relaxed, soothing effect and its short, dense structure. That indica build also means dense buds that trap moisture, so keep humidity down and run a fan through the canopy as the plant fills out in flower.
How long does it take from seed to harvest?
About 8 to 10 weeks from seed. As an autoflower it starts to bloom on its own after a few weeks, with no need to change the light cycle. Plan your feed and training around that short, fixed window, because anything that stalls an auto costs you final yield you cannot recover later.
Do I need to change the light schedule?
No. Purple Kush Auto flowers automatically, so you can run 18 to 20 hours of light from start to finish. It will not wait for a shorter day to begin flowering. A steady, generous light schedule gives this small auto the energy to build its dense, purple-tinged buds before it finishes.
Why does it turn purple?
Its Purple Kush heritage means cool night temperatures late in the cycle can bring out the purple tones in the buds, which is where the strain gets its name and its colourful look. The colour is cosmetic rather than a sign of potency, so judge ripeness by the trichomes instead.
Is Purple Kush Auto good for beginners?
Yes. It is small, fast and forgiving, which makes it beginner-friendly and ideal for a compact space. Start it in its final pot to avoid transplant shock, give it plenty of light and keep any training gentle, and it is very straightforward from seed to a colourful harvest in a small tent.
What does Purple Kush Auto taste like?
Expect sweet fruit over a soft, earthy kush base, driven by its myrcene, farnesene, caryophyllene and humulene terpenes. Dry slowly in a cool, dark space and cure in jars so that sweet, earthy kush character comes through at its best, and so the buds hold their colour after harvest.
