Northern Lights Strain Autoflower SeedsNorthern Lights with ruderalis genes: no light change, small plants
No reviews yet · be the first to review Northern LightsThe Northern Lights strain in autoflower form crosses the old Afghani × Thai indica with ruderalis, so each plant starts blooming by age instead of waiting for longer nights. Seed makers list about 9 to 12 weeks from seed to harvest and heights of roughly 60–120 cm. You keep the earthy, sweet Northern Lights character in a smaller plant that can finish under an 18-hour light schedule or within one summer outdoors.
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What is the Northern Lights strain?
Northern Lights Auto is the Afghani-Thai indica Northern Lights crossed with ruderalis, so it moves into flower on its own after a few weeks of growth instead of responding to day length. Sensi Seeds built its version from Northern Lights #5 and #2 plus a feminized autoflowering indica, then backcrossed to the Northern Lights parents. Seed makers list about 9 to 12 weeks from seed to harvest, heights of about 60–120 cm and THC near 14–18%, a little below the photoperiod's range.
Sensi Seeds' ratio for the photoperiod Northern Lights; SeedFinder lists the Automatic at about 80% indica, with ruderalis making up the rest.
Sensi Seeds says its Northern Lights Automatic begins flowering 20 to 30 days after the seedling appears, with no change to the light schedule.
Northern Lights strain specs
The autoflower figures below come from Sensi Seeds' Northern Lights Automatic and Royal Queen Seeds' Northern Light Automatic, the two best-documented lines, checked against SeedFinder. Flavor and effect data mostly come from the photoperiod Northern Lights on Leafly and AllBud, since few reviewers separate the auto from the original.
| Type | Autoflowering indica (Northern Lights × ruderalis) |
|---|---|
| Genetics | Northern Lights (Afghani × Thai) × ruderalis; Sensi uses NL #5 and NL #2 with an autoflowering indica |
| Bred by | Original Northern Lights: unknown US grower, refined in the Netherlands; autoflower lines by Sensi Seeds, Royal Queen Seeds and others |
| THC | About 14–18% for the autos (RQS lists about 14%); the photoperiod tests 15–21% |
| CBD | Low |
| Main terpenes | Myrcene, caryophyllene, limonene (from the photoperiod parent) |
| Aroma & flavor | Earthy and lightly sweet, with pine, lemon and a touch of spice |
| Reported effects | Relaxing, body-heavy, sedative at higher doses |
| Seed type | Autoflowering feminized (female plants) |
|---|---|
| Seed to harvest | About 9–12 weeks (RQS 9–10 weeks; Sensi as little as 11 weeks) |
| Outdoor harvest | Roughly 2.5–3 months after sowing; spring and early-summer sowings both work |
| Height | Sensi 60–90 cm (2–3 ft); RQS about 80–120 cm (2.6–4 ft) indoors |
| Yield | Medium; RQS lists 500–550 g/m² indoors and roughly 90–220 g (3–8 oz) per plant outdoors |
| Difficulty | Easy |
| Best methods | Final pot from day one, gentle LST, sea of green |
| Climate | Indoors on 18–20 hours of light, or outdoors in warm, sunny summers |
Where does the Northern Lights strain come from?
Northern Lights Auto comes from crossing the photoperiod Northern Lights with Cannabis ruderalis, a hardy wild type whose genes make a plant flower by age. Sensi Seeds describes its own version as Northern Lights #5 and #2 combined with its feminized autoflowering indica and then backcrossed to the Northern Lights parents, so most of the plant's shape and smell stays true to the original.
The photoperiod behind it is the Afghani-based indica first grown in Washington state and carried to Holland in the mid-1980s, where The Seed Bank, later bought by Sensi Seeds, made it famous. Other autoflower versions, such as Royal Queen Seeds' Northern Light Automatic, use their own ruderalis partner, which is why timing and height differ a little between seed makers.
How is Northern Lights Auto different from the original?
Northern Lights Auto is smaller, quicker from seed and a little less potent than the photoperiod Northern Lights, and it never needs a change of light schedule. The photoperiod version only blooms once nights reach 12 hours, and usually spends 3 to 5 weeks in veg plus 7 to 9 weeks in flower; the auto runs its whole life in about 9 to 12 weeks. Seed makers list around 14–18% THC for the auto against roughly 15–21% for the original.
An auto can't be kept as a mother plant. Cuttings from Northern Lights Auto carry the same internal clock and flower while still tiny, so most growers start every round from seed.
What does Northern Lights Auto taste like, and how does it feel?
Aroma and flavor
Northern Lights Auto tastes earthy and slightly sweet, with pine and lemon, according to Sensi Seeds, and its aroma picks up citrus and a little spice once the buds are dried.
- Earthy
- Sweet
- Pine
- Lemon
- Spice
Terpenes
- Myrcene
- Earthy, musky core
- Caryophyllene
- Spicy, peppery note
- Limonene
- Fits the lemon in Sensi's description
This terpene data comes from the photoperiod Northern Lights; few labs test the auto separately.
Reported effects
Northern Lights Auto is reported to be relaxing and sedative, with a full-body heaviness that most users save for the evening. Sensi Seeds adds that some people notice a thoughtful, creative edge before the body effect takes over.
- Relaxed
- Sleepy
- Calm
- Thoughtful
Expect the usual Northern Lights Auto downsides: dry mouth, dry or red eyes and, for newer users, an effect that can land harder than planned.
These Northern Lights Auto effects combine Sensi Seeds' description with Leafly and AllBud reports for the Northern Lights family. People respond differently, and nothing here is medical advice.
How do you grow Northern Lights seeds?
Northern Lights autoflower seeds make a simple grow: sow each seed in its final pot, run 18 to 20 hours of light a day from start to finish, use only gentle training, and expect a harvest about 9 to 12 weeks after the seedling appears.
- GerminateDays 1–5
Plant straight into the final container, such as an 11–15 liter (3–4 gallon) pot, so the taproot is never disturbed during the short life cycle.
- Early growthWeeks 2–4
Northern Lights Auto puts on leaves fast for a few weeks. Bend the main stem down gently in week 2 or 3 for a flatter canopy, and skip topping.
- FlowerWeeks 4–10
Sensi Seeds says bloom starts 20 to 30 days after the seedling emerges and lasts roughly 50 to 60 days, with little height gain once buds form.
- HarvestWeeks 9–12 from seed
Check the trichomes with a loupe and cut when most are cloudy. Royal Queen Seeds lists 9–10 weeks and Sensi about 11, so follow your seed maker's timing.
Grow tips for Northern Lights
- Keep the lights on long. Northern Lights Auto flowers by itself, so 18 or 20 hours of light from seed to harvest gives it the most energy for buds.
- Avoid stress in the first month. With only about three weeks before bloom, transplant shock or heavy pruning costs Northern Lights Auto size it has no time to recover.
- Feed lighter than a photoperiod. Small, quick Northern Lights Auto plants use less food than the photoperiod; start at a low dose and raise it slowly as flowers form.
- Fill a small tent with several plants. At about 60–90 cm on Sensi's figures, several Northern Lights Auto plants fit under one light as a sea of green.
- Sow twice outdoors. Because Northern Lights Auto ignores day length, gardens with warm summers can sow in spring and again in early summer for two harvests.
- Plan where the buds will dry. Sensi notes little odor while Northern Lights Auto grows, but the earthy, citrus-spice scent strengthens during drying, so choose a ventilated spot.
Is Northern Lights the right strain for you?
Great pick if you
- Want a compact, easy plant for a small tent or balcony
- Prefer a relaxing evening indica
- Want a harvest within about three months of sowing
- Would like more than one outdoor crop in a summer
Think twice if you
- Want the biggest yield per plant (Sensi points to its feminized photoperiod for that)
- Want to keep mother plants and take cuttings
- Are chasing THC above 20%
- Prefer bright, energetic sativas
Northern Lights strain FAQ
Is Northern Lights Auto an indica?
Yes, mostly. Northern Lights Auto keeps the indica character of the photoperiod Northern Lights, which Sensi Seeds lists at about 90% indica, and adds ruderalis genes for autoflowering. SeedFinder puts Sensi's auto at roughly 80% indica. The plants stay short and the effect is reported as relaxing.
How long does Northern Lights Auto take from seed to harvest?
Most Northern Lights Auto lines finish about 9 to 12 weeks after sprouting. Royal Queen Seeds lists 9–10 weeks for its Northern Light Automatic, and Sensi Seeds says its Automatic can be ready in as little as 11 weeks from germination.
Does Northern Lights Auto need 12/12 lighting?
No. Northern Lights Auto starts flowering on its own about three to four weeks after sprouting, whatever the light schedule. Most indoor growers keep the lights on 18 to 20 hours a day for the entire grow.
How tall does Northern Lights Auto grow?
Sensi Seeds lists its Northern Lights Automatic at 60–90 cm (2–3 ft) at harvest, with little stretch once flowering begins. Royal Queen Seeds' version can reach about 80–120 cm indoors, and outdoor plants in full sun run taller.
How much does Northern Lights Auto yield?
Expect a medium crop. Sensi Seeds rates its Northern Lights Automatic as a medium yielder and recommends the feminized photoperiod for a bigger harvest, while Royal Queen Seeds' sheet gives 500–550 g/m² under indoor lights and up to about 220 g per plant outdoors in ideal conditions.
Is Northern Lights Auto as strong as the original Northern Lights?
It is usually a little milder. Seed makers list Northern Lights Auto at roughly 14–18% THC, with Royal Queen Seeds quoting about 14%, while the photoperiod Northern Lights tests around 15–21%. Users still describe a heavy, relaxing effect.
Can you clone Northern Lights Auto?
Cloning Northern Lights Auto rarely works well. A cutting keeps the parent plant's age-based clock, so it starts flowering while still very small. For mother plants and cuttings, grow the feminized or regular photoperiod Northern Lights instead.
When should I plant Northern Lights Auto outdoors?
Sow Northern Lights Auto outdoors once nights stay mild in late spring. It ignores day length, so a spring sowing is usually ready about 2.5 to 3 months later, and warm regions can fit a second round in early summer.
What does Northern Lights Auto smell like?
Northern Lights Auto smells earthy and slightly sweet with pine and lemon. Sensi Seeds says the scent grows stronger after harvest, adding citrus and spice, while odor during the grow itself stays low.
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