Northern Lights autoflower cannabis plant with a compact, resin-coated main cola

Autoflower seeds

Northern LightsxRuderalis

THC: 18-22%
Bloom: 8-10 wks from seed
Yield/sq ft: 1.5-1.8 oz
Level: Easy

Northern Lights Autoflower Seeds

From $65.00

Earthy pine, soft sweetness and a spicy finish. The classic Northern Lights indica as an easy autoflower, ready about 8-10 weeks from seed.

THC18-22%
Bloom8-10 weeks from seed
Height2-4 ft
LevelEasy

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SKU: BMS-NL-AUTO Categories: Autoflower Seeds, Beginner Seeds, Fast Flowering Seeds, Indica Seeds, Indoor Seeds Tag: Bestseller

Quick answerNorthern Lights Autoflower is the classic Northern Lights indica crossed with ruderalis, so it flowers on its own whatever the light schedule. It is known for an earthy, piney, sweet aroma, supplier-reported THC of 18-22%, a compact 2-4 ft frame and a harvest about 8-10 weeks from seed.

Northern Lights Auto at a glance

THC18-22%Supplier reported. Classic indica potency on an auto timer.

Flowering8-10 wksFrom seed, no light flip

Indoor yield1.5-1.8 ozPer sq ft under 18/6 or 20/4

Height2-4 ftCompact, one main cola

Outdoor harvest10-12 wksAfter sprouting, 2-3 runs a season

DifficultyEasy, built for first growsNo topping and no light schedule change to manage

What is the Northern Lights Autoflower strain?

Northern Lights is one of the classic indicas of the 1980s, with roots in the Pacific Northwest and later Dutch seed breeding. Growers kept it in rotation for decades for two simple reasons: it is forgiving, and it is covered in resin. This version crosses that line with ruderalis to make it an autoflower.

Ruderalis genetics change the clock, not the character. Instead of waiting for longer nights, the plant starts flowering by itself after a few weeks of growth, whatever light schedule you run. You keep the lights at 18/6 or 20/4 from seed to harvest, and most plants are ready about 8 to 10 weeks from seed.

Expect a short, sturdy plant at 2 to 4 feet with one dominant main cola and a handful of side branches. That small footprint suits a 2×2 or 3×3 ft tent, a closet or a balcony, and the quick finish lets outdoor growers fit more than one harvest into a single season.

Northern LightsRuderalis

Northern Lights x RuderalisAutoflower line

Northern Lights Auto

How it feels

Consumers commonly describe a warm, calm body feel that builds slowly and turns drowsy, with a mild, happy mood on top. Most people save it for the evening.

First 10 minutesSoft, happy start
A mild lift in mood and a loosening of tension in the shoulders.
30 to 60 minutesDeep calm
The indica side settles in with heavy, unhurried relaxation.
Later in the eveningDrifting off
Many people report getting drowsy and calling it a night.

Commonly reportedRelaxedSleepyEuphoricCalm

Supplier-reported THC of 18-22%: start low, especially with a new batch. Dry mouth, dry eyes and next-morning grogginess are the most commonly reported downsides. General reports, not medical guidance.

Aroma, flavor and terpenes

Earthy and piney at first sniff, with a soft sweetness and a spicy, peppery finish once the buds are ground. It is an old-school indica nose rather than a candy or fuel profile. The smell builds in the last few weeks, so run a carbon filter in small spaces.

Flavor notesEarthyPineSweetSpicy

MyrceneEarth, musk

Builds the earthy, slightly sweet base.

CaryophyllenePepper, spice

Adds the warm, spicy bite on the exhale.

LimoneneCitrus, sweet

Brightens the sweet top note over the pine.

Autoflowers ripen quickly, so start checking trichomes around week seven. Dry for 10-14 days at about 60°F and 60% humidity, then jar cure to hold on to the pine and spice.

How to grow Northern Lights Auto

Rated easy. As an autoflower, it needs no light flip and no topping. The main jobs are a clean start, steady light and a light hand with nutrients.

Indoors

Light schedule: 18/6 or 20/4, seed to harvest
Early climate: 70-80°F, 50-60% RH
Flower climate: 68-80°F, 40-50% RH
Light: 600-900 PPFD in flower (LED)
Training: LST only, weeks 2-4; no topping
Container: Final pot from day one, 3-5 gal

Outdoors

Plant out: After last frost, nights above 50°F
Size: Low profile, 2-4 ft
Harvest: 10-12 weeks after sprouting
Runs per season: 2-3 in long-season states
Best fit: Almost anywhere, short seasons included
Watch for: Humid spells as buds ripen

Read the full indoor grow guide

Northern Lights Auto is one of the easiest ways to learn indoor growing. Because it is an autoflower, it never needs a 12/12 switch. Run the same 18/6 or 20/4 schedule from the day the seedling breaks the soil until harvest, and the plant moves into flower on its own.

Start it right

Autoflowers run on a fixed timeline, so an early setback costs yield you cannot win back. Germinate, then plant straight into the final container, roughly 3 to 5 gallons, to avoid transplant shock. Use a light, airy mix and water in a small ring around the seedling for the first week or two.

Environment

Early growth: 70-80°F with 50-60% relative humidity.
Flower: 68-80°F and 40-50% RH. Keep air moving around the main cola as it fills in.
Light: about 200-400 PPFD for seedlings, rising to 600-900 PPFD in flower under LED.

Training

Skip topping, since autoflowers have little time to recover from cuts. Use gentle low-stress training between roughly weeks 2 and 4 instead, bending the main stem so side branches catch more light, and stop once flowers start to form.

Feeding and harvest

Feed lightly. Autos generally need less than photoperiod plants, and this compact indica is easy to overfeed. Most plants are ready about 8 to 10 weeks from seed. Judge by trichomes: mostly cloudy heads with some amber suit its relaxing character.

Seed to jar in about 15 weeks

A typical indoor run under 18/6 or 20/4. Most plants finish 8-10 weeks from seed; slower plants and outdoor runs can take 10-12 weeks.

Germinate1 wkSeedling1 wkEarly growth2 wkFlower7 wkDry and cure4 wk

Week 1Week 15

Germinate weeks 1-1
Plant straight into the final pot
Seedling weeks 2-2
18/6 or 20/4 from day one
Early growth weeks 3-4
Gentle LST only, done by week 4
Flower weeks 5-11
Starts on its own, no flip
Dry and cure weeks 12-15
60°F, 60% RH, then jars

Growing Northern Lights Auto outdoors in the US

Outdoors, this autoflower ignores day length, which changes how you plan a season. A plant set out after your last spring frost, once nights stay above about 50°F, is typically ready 10 to 12 weeks after sprouting. That is a little slower than indoors, because outdoor plants see cooler nights and fewer hours of strong light.

Each run is short, so in warmer states many growers fit 2 to 3 harvests into one season: a spring crop, a midsummer crop and a last run started early enough to finish before fall frost. Short northern seasons work too. In the upper Midwest, northern New England or a mountain town, a late-May planting can be ready by mid-August, well ahead of cold, wet weather.

Plants stay small outdoors, roughly 3.5 to 7 ounces each, so the payoff comes from timing and repeat runs rather than one giant plant. Our autoflower vs feminized guide explains the trade-off, and the harvest date calculator helps you stack runs. Check your state’s home-grow rules and plant limits before you start.

Will it finish where you live?

GoodInland California and the Southwest

A long season fits 2-3 runs, but shade small plants during peak summer heat.

ExcellentColorado Front Range and Utah valleys

Short mountain seasons and dry air suit a fast, compact indica.

ExcellentMidwest

Plant in late May for a midsummer harvest, then start a second run.

GoodNortheast

Finishes well before fall rains; keep airflow up through humid August weeks.

GoodSoutheast and Gulf Coast

Spring and fall runs dodge the worst of the summer humidity for dense buds.

Check your state's home-grow rules before you plant. Laws by state

Who Northern Lights Auto is for

First-time growersNo light flip, no topping and an easygoing plant make it a forgiving first grow.
Small-space growersA 2-4 ft frame fits closets, 2×2 ft tents and balconies.
Short-season gardenersReady 10-12 weeks after sprouting outdoors, so even northern summers leave time for a crop.
Evening consumersAdults who prefer a classic, calm indica profile for winding down at night.

Keep exploring

Autoflower seedsMore strains that flower on their own Beginner seedsForgiving genetics for a first grow Autoflower vs feminizedWhich seed type fits your setup What is ruderalis?The genetics behind autoflowering Harvest date calculatorPlan back-to-back outdoor runs

Northern Lights Auto strain data sheet

Genetics

Seed type: Autoflower
Genetics: Indica-dominant hybrid (about 90% indica, with ruderalis for autoflowering)
Lineage: Northern Lights x Ruderalis

Potency & profile

THC: 18-22% (supplier reported)
CBD: 0.1-1%
Commonly reported effects: Calm, Euphoric, Relaxed, Sleepy
Flavors: Earthy, Pine, Spicy, Sweet
Dominant terpenes: Caryophyllene, Limonene, Myrcene

Growing

Flowering time: 8-10 weeks from seed
Height: 2-4 ft
Difficulty: Easy
Climate: Mild, 68-80°F, 40-50% RH in flower
Best USDA zones: 3-10 (needs only 10-12 warm weeks)
Outdoor harvest: 10-12 weeks after sprouting (2-3 harvests per season possible)

Yield

Indoor yield: 1.5-1.8 oz per sq ft
Outdoor yield: 3.5-7 oz per plant

Ranges are typical for this strain and vary with phenotype, environment and technique.

Northern Lights Auto FAQ

Is Northern Lights Auto indica or sativa?

It is an indica-dominant hybrid, about 90% indica, with ruderalis genetics added to make it autoflower. It grows short and sturdy, and consumers usually describe a calm, relaxing effect.

How strong is Northern Lights Autoflower?

Our supplier reports THC of 18-22%, which is solid potency for an autoflower. Actual results depend on phenotype, light intensity and harvest timing.

How long does Northern Lights Auto take to grow?

Indoors under 18/6 or 20/4, most plants are ready about 8 to 10 weeks from seed. Outdoors, plan on 10 to 12 weeks after sprouting, since cooler nights and shorter light hours slow it slightly.

How much does Northern Lights Auto yield?

Indoors, a dialed-in setup can produce roughly 1.5 to 1.8 ounces per square foot. Outdoor plants are smaller, roughly 3.5 to 7 ounces each, but you can often fit 2 to 3 crops into one season.

Is Northern Lights Auto good for beginners?

Yes. It is rated easy: there is no light schedule change to manage, no topping is needed and the plant tolerates small mistakes. The main rules are to plant into the final pot and keep feeding light.

What does Northern Lights Auto smell and taste like?

Earthy pine leads, followed by a mild sweetness and a spicy, peppery finish. Myrcene, caryophyllene and limonene are the terpenes most commonly reported.

Can I grow Northern Lights Auto outdoors in the US?

Yes, and it suits more of the country than most strains because it needs only about 10 to 12 warm weeks. Short northern seasons can fit one or two runs, while warmer states can fit 2 to 3 harvests between spring and fall.

Do I need to change the light schedule to make it flower?

No. As an autoflower, it starts flowering based on age, not day length. Keep the lights on 18/6 or 20/4 from seed to harvest, and skip topping in favor of gentle LST early on.

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