Autoflower Cannabis Seeds
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Autoflower seeds start to flower on their own after a few weeks, with no change in the light schedule, so a grow is simpler and quicker. Many of our autoflower strains stay compact and finish fast. Each product page shows THC level, plant size, flowering time and difficulty, so you can match a strain to your space before you order.
Autoflower seeds (also called autoflowering seeds or auto flower seeds) grow from seedling to harvest on their own internal timer, switching from vegetative growth into flowering by age rather than by light schedule. That's the core difference from regular and feminized photoperiod strains, and it's why autoflower seeds are usually the first stop for growers who want a straightforward, hands-off harvest.
Why Autoflower Seeds Don't Depend on Light Cycles
Photoperiod cannabis needs its light schedule switched to 12 hours on/12 hours off before it will start flowering, and outdoors it waits for the days to shorten in late summer. Autoflower genetics (bred from ruderalis, a subspecies that evolved to flower on a fixed schedule regardless of daylight) skip that dependency entirely. Leave the lights on 18-20 hours a day, or plant outdoors any time the weather allows, and the plant moves into flowering on its own a few weeks in — no schedule changes to track, no risk of accidentally stressing the plant back into vegetative growth.
Autoflower Seeds for Small Spaces and Beginners
Because they flower automatically, autoflower seeds also finish fast — most varieties go from seed to harvest in 8-10 weeks, letting you fit two or three cycles into a single season where a photoperiod strain might manage one. Their compact size suits closets, small tents, and balconies, and the lack of any light-cycle management makes them one of the more forgiving options for a first grow.
High-THC and CBD Autoflower Seeds
Autoflower genetics now cover a wide range of potency profiles, not just fast and easy. Our lineup includes high-THC autoflower seeds bred for maximum strength alongside CBD-rich autoflower seeds for a milder, more functional effect, so the format works whether you're growing for potency or a gentler experience — and either way, autoflower seeds still deliver the same quick, low-maintenance harvest.
Autoflower vs. Feminized Seeds: Which Should You Choose
Autoflower and feminized seeds solve different problems, and most growers eventually want both. Feminized seeds are photoperiod plants — bigger, slower to finish (10-14 weeks), and controlled by light schedule, which rewards growers with space and patience with a larger final yield. Autoflower seeds trade some of that size and yield for speed and simplicity: a fixed 8-10 week timeline, no light-schedule management, and a plant that finishes on its own regardless of season. If total harvest size matters more than speed, start with feminized; if a fast, low-maintenance grow matters more, autoflower is the better fit.
High-Yield Autoflower Strains
Yield used to be autoflower's biggest trade-off against photoperiod genetics, but newer autoflower lines have closed much of that gap. Look for strains bred specifically for yield rather than speed alone, and pair them with gentle low-stress training (bending and tying down branches) rather than topping, since autoflowers have a short vegetative window and don't fully recover from more aggressive techniques. Combined with a full 18-20 hour light schedule indoors, or a full-sun outdoor spot, a yield-focused autoflower strain can close most of the gap with a mid-size feminized harvest in a third of the time.
Growing Autoflower Seeds Outdoors
Because autoflower seeds don't wait for shortening daylight to start flowering, they can go in the ground any time the weather allows rather than on a fixed outdoor calendar — plant in spring for an early summer harvest, then run a second cycle before autumn where the climate allows. Outdoor seeds in general need less environmental control than an indoor tent, and autoflower's compact size and short timeline make it one of the more forgiving formats for a first outdoor grow, tucked into a garden bed, large pot, or balcony planter without needing to hide a full-season plant.
Autoflower Seeds FAQ
How long does it take to grow autoflower seeds from seed to harvest?
Most autoflower strains finish in 8-10 weeks total from germination, though some fast varieties finish closer to 7 weeks and slower, higher-yield strains can run 11-12. That's roughly half the timeline of a typical feminized photoperiod strain.
Do autoflower seeds need a specific light schedule?
No — that's the core advantage. 18-20 hours of light a day indoors is typical and gets the fastest growth, but autoflower genetics will still finish flowering on their own timeline even under a shorter or irregular schedule, unlike photoperiod strains that depend on a 12/12 switch to trigger flowering.
Can autoflower plants be topped or trained?
Light training works well — low-stress training and moderate defoliation both suit autoflowers. Topping and heavier techniques are riskier, since autoflowers have a short vegetative window and may not fully recover the lost growth time before flowering starts.
Are autoflower seeds good for beginners?
Yes — the fixed flowering schedule removes one of the most common early-grower mistakes (accidentally interrupting light cycles or planting too late in the season), and the shorter timeline means less time invested if anything does go wrong.
How does autoflowering work?
An autoflower is a cannabis plant that starts flowering at a set age, usually after three to four weeks, no matter how many hours of light it gets. Most cannabis is photoperiod, which flowers when the nights get long. Autoflowers carry genetics from Cannabis ruderalis, a type that evolved in northern regions with short summers.
From seed to harvest most strains need about 10 to 14 weeks. Our autoflowers are listed with a fast flowering time of 6 to 10 weeks, so a tent can run several rounds in a year.
Autoflower seeds for sale
The range includes sativa-dominant, indica-dominant and hybrid autoflowers, and most are compact plants. That suits tents, balconies and small gardens. About half carry the easy difficulty rating, and the rest are easy to moderate or moderate. THC is listed per strain as an "up to" figure, mostly from the high teens to the mid 20s.
Good places to start are Caramelicious autoflower, rated easy with up to 24 percent THC, and Northern Lights XTRM autoflower, also easy and compact.
Autoflower or feminized: which should you buy?
Buy an autoflower if you want speed, a small plant and no light schedule to manage. Buy a feminized photoperiod seed if you want one larger plant and control over how long it grows. Autoflowers finish sooner and stay smaller. Photoperiod plants usually yield more per plant when you give them time.
Feminized describes a plant's sex and autoflower describes how it flowers, so the two are not opposites. The product page shows the seed type for each strain. Our feminized seeds page covers the photoperiod side.
Autoflowering sativa seeds
A sativa-dominant autoflower is taller than an indica autoflower, but it still runs on a fixed clock. It will not stretch the way a photoperiod sativa does when you flip the lights, which makes it more manageable indoors. Expect a lighter yield than a full-size photoperiod sativa.
Our range has a group of sativa autoflowers, and they are listed in the sativa seeds category as well. Green Crack autoflower is one example, a taller autoflower rated easy.
Auto feminized seeds for indoor tents
For a tent, choose a compact autoflower and plant it straight into its final pot. Many growers use pots between 11 and 19 liters (3 to 5 US gallons) so the roots are never disturbed. Autoflowers do not like transplanting, and they have no spare weeks to recover from it.
Light them for 18 hours a day from start to finish, or 20 if you prefer. Our indoor seeds page covers tent size and ventilation.
How big do autoflower plants get?
Most of our autoflowers are listed as compact plants, and a few are average or tall. Expect a smaller plant than a photoperiod one grown the same way, because the plant spends fewer weeks in the vegetative stage and cannot be given more. Pot size, light and feeding still decide where in that range your plant ends.
For the most flower from a small space, give an autoflower a strong light and an even canopy.
Are autoflowers good for beginners?
Often yes. There is no light schedule to change, the plant stays small and the cycle is short. The catch is that an autoflower cannot make up lost time, so early mistakes show in the harvest. Avoid moving the plant between pots.
What can go wrong with autoflowers?
The common problems are transplant shock, overwatering and low light. Each one costs time that an autoflower cannot get back, because its clock keeps running while the plant recovers. The fix is to prepare: use the final pot from the start, water lightly, and give the plant a good light on its first day.
How should you train and feed an autoflower?
Gentle methods work best. Low stress training, where you tie branches down with soft ties, spreads the plant out without stressing it. Heavy pruning is risky because there is little time to recover. Feed lightly at first, since autoflowers use fewer nutrients than large photoperiod plants, and raise the dose slowly if the leaves stay green.
When is an autoflower ready to harvest?
Go by the plant, not the calendar. When most of the pistils have darkened and the trichomes (the tiny resin glands) look cloudy rather than clear, the flowers are close to ready. Flowering times listed on each product page tell you when to start checking.
Light, watering and outdoor use
Water in small amounts while the plant is young and increase as it grows. Overwatering a seedling is the most common mistake. Outdoors, plant autoflowers once the nights are mild and keep young plants away from frost. Our outdoor seeds page has the planting calendar for both hemispheres.
Buying autoflower seeds from the US, UK or Australia
You can order autoflower seeds from our Amsterdam seed bank. See the payments and shipping page for how orders reach different countries, and check your local law first. Seeds that fail to sprout are covered by our germination guarantee. For growing steps, read the germination guide and the grow guide.
Frequently asked questions
Most autoflower strains take about 10 to 14 weeks from planting to harvest. Our product pages list a flowering time for each strain, and our autoflowers are listed at 6 to 10 weeks of flowering. The first three to four weeks are the vegetative stage, so add those on top.
No. Autoflowers flower by age, not by the light cycle. Many growers keep them on 18 hours of light a day for the whole grow, and some run 20 hours. A 12/12 schedule is only needed for photoperiod plants, which wait for longer nights before they flower.
Feminized describes the sex of the plant, autoflower describes how it flowers. A feminized photoperiod plant waits for a change in the light schedule before it flowers, while an autoflower flowers on its own after a few weeks. A seed can be both feminized and autoflower, so check the seed type on the product page.
Per plant, usually yes: autoflowers stay smaller and have no extended growth stage. They are ready sooner, though, so some growers fit in more harvests per season. For the biggest single plants, choose a photoperiod strain and give it a longer vegetative stage.
Many growers plant the sprouted seed straight into its final pot, often 11 to 19 liters (3 to 5 US gallons), because autoflowers dislike root disturbance. A smaller pot limits the plant and a pot that is too large for a seedling holds water, so water in small amounts early on.
You can take a cutting, but the cutting keeps the age of the mother plant, so it tends to flower almost at once and stays small. For that reason most growers start every autoflower grow from seed. If you want a mother plant to clone, regular or feminized photoperiod seeds are the better choice.
