Autoflower week-by-week pictures are the fastest way to check whether your plant is on track, because most autoflowers finish from seed to harvest in roughly 8-10 weeks, and every week brings a visible change. This guide walks through the full autoflower timeline from germination through harvest, with healthy size ranges, visual cues, grow tips, and troubleshooting guidance.
By the end you’ll know what a 1-week, 3-week, 6-week, and 2-month old autoflower should look like, how to tell if your plant is stunted or behind schedule, and what to do about a small or stunted autoflower while there’s still time to recover.
How Long Does an Autoflower Take From Seed to Harvest?
Autoflowering plants finish their full life cycle in 6-14 weeks from germination, with most auto strains taking 8-10 weeks from seed to harvest. Fast-finishing autos can wrap up in 6–8 weeks from seed, while the slowest varieties can stretch to 12–14 weeks. The cycle starts the day your autoflower cannabis seeds break the soil and ends at harvest.
Autoflowers move through every stage on an age-based schedule, so flowering happens automatically, whether you’re using an 18/6, 20/4, or 24-hour light cycle — no light schedule change needed.
This is thanks to the autoflowering genetics from ruderalis (the wild cannabis subspecies originating in southern Siberia) that evolved to flower by age — an adaptation to the region's short summers.
Autoflower Week by Week Pictures: Full Life Cycle
Autoflower cannabis plants move through germination, the seedling stage, vegetative growth, pre-flower, flowering, ripening, and harvest in roughly 8 to 10 weeks. Each week brings visible changes you can match against the pictures below.
| Autoflower Week | Average Auto Plant Height | Autoflower Growth Stage | Key Visual Sign |
| Week 1 | ~0.5-1 inches | Germination and seedling | Two cotyledons emerge |
| Week 2 | 2-4 inches | Late seedling | First true leaves |
| Week 3 | 4-6 inches | Early veg | 2-3 sets of fan leaves |
| Week 4 | 6-10 inches | Late veg & pre-flower | First calyxes & pistils form |
| Week 5 | Stretching 30-50% | Pre-flower & stretch | Calyxes start clustering |
| Week 6 | 12-18 inches | Early flowering | First true bud sites form |
| Week 7 | Height growth slows | Mid flowering | Buds start swelling |
| Week 8 | 18-30 inches (typical final size) | Late flowering | Buds fatten & resin builds |
| Week 9 | 18-30 inches (typical final size) | Late flowering, pre-harvest | Trichomes mostly milky |
| Week 10 | 18-30 inches (typical final size) | Peak harvest window opens | 30% amber trichomes, mostly brown pistils |
| Week 11 | 18-30 inches (typical final size) | Final ripening | Buds finish swelling |
| Week 12+ | 18-30 inches (typical final size) | Peak late-strain harvest | Peak milky-to-amber mix |
If you’re tracking plant age in months rather than weeks, a one-month-old autoflower sits at roughly week 4, a two-month-old plant is around week 8, and a three-month-old auto is at, just passed, or near harvest across most strains.
1-Week Old Autoflower: The Seedling Stage
A week 1 autoflower seedling breaks the soil 1-5 days after germination, then pushes the first round cotyledon leaves up toward the light. Cotyledons are the two smooth, oval-shaped embryonic leaves the seed carries inside its shell, and they feed the plant until true leaves take over.
The seedling is fragile in this first week. Keep the soil damp but not wet, hold light close enough to prevent stretch but far enough to avoid heat stress, and skip nutrients entirely because the cotyledons supply everything the autoflowering plant needs.
2-Week Old Autoflower: Late Seedling and Early Veg
A week 2 autoflower plant forms the first set of true serrated leaves and shifts from cotyledon energy to early photosynthesis. The true leaves carry the classic cannabis blade shape, usually with 1 or 3 points on this first set.
By the end of the week, a healthy 2-week-old autoflower stands roughly 2-4 inches tall. Some growers introduce a light feed at a quarter strength now, but autoflowers do well on plain water for another few days because their root mass is still small.
3-Week Old Autoflower: Early Vegetative Growth
A week 3 autoflower plant stands around 4-6 inches tall, pushes 2-3 sets of fan leaves, and starts spreading the root mass. Node spacing stays tight as the blade count climbs from 3 to 5 to 7 across each new fan leaf set.
Growth speeds up sharply this week because the root zone catches up to the canopy. The plant takes regular light feeding now, with humidity around 55-65% supporting steady leaf expansion.
4-Week Old Autoflower: Late Veg and the First Pre-Flower Signs
A week 4 autoflower plant — now about a month old — doubles in size, fills the canopy with fan leaves, and often shows the first pre-flower calyxes at the nodes, with faint white, hair-like pistils beginning to emerge from them.
The nodes are the joints where branches and leaves meet the main stem, and the calyx is the small, pointed, pod-like structure that forms first, with the pistil growing out of it as the flowering transition begins.
Some growers begin low-stress training this week, gently bending the main stem to spread the canopy and even out light exposure. By the end of week 4, the plant runs 6-10 inches tall and may begin to give off a faint cannabis smell, depending on the strain.
5-Week Old Autoflower: Pre-Flowering and the Stretch
A 5-week old autoflower’s calyxes continue forming — stacking at every internode — with pistils growing out of each one. Beneath these ‘pistil clusters,’ smaller sugar leaves also start forming while the bigger fan leaves stay green and healthy. Vertical growth is often aggressive in pre-flowering as the main stem stretches to set future bud sites.
That stretch can add another 30-50% to the plant's height across this week and the next. For now, continue any low-stress training (LST) to keep the canopy even and open, but do it gently — rather make small daily adjustments instead of big weekly changes.
6-Week Old Autoflower: Early Flowering and Bud Sites
A week 6 autoflower plant forms its first true bud sites — individual calyxes begin clustering at the nodes, and that classic cannabis aroma intensifies. Vertical growth slows at around 12-18 inches tall as the plant turns its energy toward flower production. It’s a good time to stop low-stress training, since it needs that energy for the next phase.
This is when growers shift to a flowering nutrient mix, with higher phosphorus and potassium and lower nitrogen to match what the 6-week old auto now needs. But feed carefully — autoflowers don’t need as much as photoperiod plants.
7-Week Old Autoflower: Mid Flowering and Packing on Bud Weight
A week 7 autoflower plant packs on bud weight, with calyxes swelling and trichomes lightly coating the sugar leaves. Trichomes are the tiny resin-producing glands on the surface of the buds and surrounding leaves, and they look like a fine frost dusting at this stage.
The bud sites along the main cola swell and pack together into longer, denser flower clusters. The aroma strengthens, the pistils stay mostly white, and the plant drinks more water as the flowers expand.
8-Week Old Autoflower: Late Flowering and Resin Building
A week 8 autoflower plant thickens the cola as resin production peaks, and pistils begin curling inward and darkening from white to a reddish-orange. The cola is the main flower formation at the top of the plant and side branches, and it carries most of the harvest weight.
The aroma hits its strongest point this week, and the lower fan leaves start yellowing as the plant moves mobile nutrients from those leaves into the fattening flowers.
9-Week Old Autoflower: The Trichome Shift and Tapering or Flushing
Mostly clear trichomes mean the 9-week old autoflower isn't ready to harvest yet, while mostly milky with a few amber trichomes signal peak cannabinoid expression. Mostly amber trichomes shift the profile toward more sedative effects.
Pistils also start turning orange-brown. It’s a useful secondary check, but they can darken early from stress, heat, or due to genetics, even when the auto isn't harvest-ready.
At this point, most growers flush or start winding down nutrients. Growers who flush typically run plain water through the root zone for 7-14 days before harvest to clear residual salts, while growers who prefer to taper reduce nutrient strength gradually over that same window.
Flushing is contested by many growers and supporting scientific research is limited. Some argue that cutting nutrients late in flower can stress the plant and reduce final bud weight.
But salt buildup is mostly a concern with synthetic nutrients and inert media like hydro or coco (not organic or living soil). Both flushing and tapering are widely used, so it ultimately boils down to personal preference.
10-Week Old Autoflower: The Harvest Window Opens
Week 10 marks the typical harvest window for most autoflowering strains, with the traditional target sitting at roughly 70% milky and 30% amber trichomes. Use a jeweler's loupe or USB microscope to read trichome color accurately.
A 10-week old autoflower that's genuinely harvest-ready shows all three signs together, not just one. Look for buds that have stopped adding new white pistils, yellowing fan leaves, and trichomes at that perfect milky-to-amber ratio.
Once you’ve confirmed harvest-readiness, it’s time to cut, dry, and cure:
Cut the main stem, remove the large fan leaves, and hang your autoflowering plant upside down in a dark, ventilated space for 7-10 days, then cure in glass jars. Burp the jars once a day during week one, 2-3 times a week during week 2, and once a week from week 3 onward.
11-Week Old Autoflower: Late-Strain Ripening
Late-finishing autoflowers use week 11 to close the gap left over from week 10, deepening amber coverage and finishing bud swell on plants that weren't quite at the trichome target yet. Autos like White Widow Auto, OG Kush Auto, and Durban Poison Auto typically finish in 10–12 weeks from seed, so they often use this extra week to reach full ripeness.
12-Week Old Autoflower: Late-Strain Harvest
A harvest-ready autoflower reaching week 12 or beyond is usually running on genuinely slow genetics. Look for the same visual cues — a 70/30 milky-to-amber trichome ratio, pistils mostly brown, and yellowing leaves.
If your autoflower is a normally faster strain and you're still waiting well past week 12, it's worth double-checking that you haven't simply run past the harvest window. Once you’ve confirmed peak ripeness, cut, dry and cure exactly the same way as a week 10 harvest.
When Do Autoflowers Start Flowering?
Autoflowers start flowering between week 4 and week 5 from germination, triggered automatically by plant age. The shift happens in stages: small, teardrop-shaped calyxes form at the nodes as early as week 3, and the first pistils emerge in weeks 4 to 5. True bud sites form by week 5 to week 6 as more calyxes develop and cluster together at each node.
An auto plant that hasn’t shown pistils by week 5 isn’t necessarily behind. Modern autoflower seeds carry ruderalis genetics crossed with indica or sativa lines, so flowering starts according to the strain’s specific genetics.
When Do Autoflowers Fatten Up and Pack on Bud Weight?
Autoflower buds fatten up between week 6 and week 8, when calyxes swell, trichomes thicken and the cola structure takes its final shape. Most weight comes on across this 3-week window, with week 7 typically driving the heaviest gain.
Higher phosphorus and potassium support the swell because the plant uses both minerals heavily during flower formation. Reported bud weight depends on strain genetics and environmental conditions, so the same strain can fatten differently from one grow to the next.
How Big Should a Healthy Autoflower Be at Each Stage?
Depending on strain genetics, a healthy autoflower stands roughly:
- 2-4 inches at week 2
- 6-10 inches at week 4
- 12-18 inches at week 6
- 18-30 inches at harvest
Compact autoflowers like Northern Lights Auto and Blueberry Auto typically finish short, while taller varieties like Durban Poison Auto and Northern Lights x Big Bud Auto stretch more during pre-flower and week 5.
Most autoflower plants stop adding height around week 6 or week 7, when flowering takes over from the stretch phase. Growers chasing taller plants and heavier bud weight often pick high yield cannabis seeds bred for size and density.
Why is My Autoflower So Small or Stunted?
An autoflowering cannabis plant is stunted when it lags two or more weeks behind the size reference for its age, with pale leaves, stalled node spacing and visibly slower growth. Most cases trace back to weak light, root-zone problems, overwatering, nutrient burn or early transplant stress. Healthy auto plants can also be small due to their genetics.
Stunted autoflower seedlings can often recover. Auto plants stunted in flowering rarely catch up. This section covers four things:
- The most common causes of autoflower stunting
- The visual signals that confirm it
- Overwatering vs underwatering
- And what recovery looks like depending on when the stress hit
Common Causes of a Stunted Autoflower
The common causes of a stunted autoflower include weak light, an over-sized or compacted root zone, overwatering, excess nutrients, or transplant stress in the first two weeks. Each cause leaves a different visible signal, so the fix depends on the signal:
- Weak light produces a tall, leggy stem with wide gaps between nodes and small pale leaves.
- An over-sized pot can drown a young seedling because the unused soil holds too much water for the small root mass.
- Nutrient burn shows up as yellow or brown leaf tips that creep inward.
- Transplant stress freezes growth for 5 to 10 days while the roots recover.
How to Tell If Your Autoflower is Stunted
An autoflower is stunted when it lags two or more weeks behind the size reference for its age. The signals below help confirm what you are seeing:
| Signal | Healthy autoflower | Stunted autoflower | Reliability |
| Height at Week 3 | 4 to 6 inches | Under 2 inches | High |
| Leaf color at Week 3 | Bright green | Pale yellow or purple | High |
| Node spacing | Tight and even | Wide gaps or stalled | Medium |
| New leaf size | Steady increase | Same size for 7+ days | High |
| Root visible at pot drain | White and fine | Brown, none or root-bound | Medium |
Is My Autoflower Overwatered or Underwatered?
Overwatering and underwatering both show up as drooping leaves. The difference lies in the details: an overwatered autoflower’s leaves look heavy and thick even while drooping, and the soil surface looks dark and wet for days at a time. An underwatered plant droops too, but the leaves look thinner and drier and the soil looks pale and dry.
Lifting the pot is one of the more reliable checks: A heavy pot points to excess water and a light pot points to a plant that needs a drink.
Can a Stunted Autoflower Recover?
Yes, a stunted autoflower can recover when the root cause is fixed in the seedling or early veg stage, but the final yield usually comes in smaller than a healthy plant. Recovery depends on how early the stress hit and how quickly the cause is corrected.
Plants stunted in week 1 or week 2 catch up well because the auto trigger has not started flowering yet. Plants stunted after week 4 finish small because the genetic age clock keeps moving toward flower whether the plant is ready or not.
Growers who lost a plant to early stunting often start the next grow with the best cannabis seeds for beginners, which tend to forgive watering and lighting mistakes during the first two weeks.
How Strain Genetics Shift the Autoflower Timeline
Strain genetics can shift the autoflower timeline by a few weeks, with Northern Lights Auto finishing in 8–10 weeks from seed and Northern Lights x Big Bud Auto needing 12–14 weeks. The ruderalis trigger is consistent across strains, but the indica and sativa parent genetics decide how long the plant stays in flower before ripening.
On the week-by-week timeline, popular autoflowers group into three finish windows:
- Standard finishers like Northern Lights Auto, Blueberry Auto, Zkittlez Auto, and Sour Diesel Auto typically wrap up in 8–10 weeks.
- Longer finishers like White Widow Auto, OG Kush Auto, Super Silver Haze Auto, and Durban Poison Auto usually need 10–12 weeks.
- Late finishers like Northern Lights x Big Bud Auto can run 12–14 weeks from seed.
Plant type alone doesn't predict finish time. Sour Diesel Auto, a mostly sativa strain, finishes on the same 8–10 week schedule as Northern Lights Auto, a mostly indica strain, so check each strain's listed timeline before planning your grow.
Indoor vs Outdoor Autoflower Week by Week
Indoor autoflowers follow the same 8-10 week timeline as outdoor autoflowers, but outdoor plants face slower seedling growth in cold soil and faster vegetative growth once temperatures climb. The week 1-3 visuals can shift by 4-7 days outdoors because soil temperature controls the seedling pace.
Indoor autoflowers run on a controlled 18/6, 20/4, or 24/0 light cycle, steady humidity and consistent temperatures, so they finish more predictably. Outdoor autoflowers face weather pressure during weeks 6-10 because heavy rain at flowering can trigger bud rot in dense colas.
How to Take Autoflower Week by Week Pictures
Comparing your autoflowering plant to the pictures in this guide only works if your own photos are consistent from week to week. Here are a few habits that make that comparison useful:
- Take the same three shots every week: a full plant photo from the front, a side profile to judge height and stretch, and a close-up of the newest growth at the top.
- Shoot from roughly the same distance each time and use white light rather than the purple or red tint of a grow light. Colored light hides yellowing and makes healthy green leaves look off.
- Include something for scale in at least one photo, such as a ruler or the same object every week, and get the pot in the frame too. Pot size and soil surface tell you as much as the plant does, since a dry, pale surface points to watering issues that a close-up of a leaf won’t show.
- Label each photo with the week number and day count, then keep the set together so you can scroll back and compare instead of relying on memory.
A single odd leaf rarely means much on its own. But a consistent pattern across several photos, not one snapshot, is what tells you whether your plant is on track.
How Seed Choice Shapes the Autoflower Life Cycle
Autoflower seed choice shapes the life cycle from day one because the seed carries the ruderalis genetics that trigger flowering by age and the indica and/or sativa genetics that set height, stretch, and final harvest weight.
Every autoflower timeline starts at the seed, and the marijuana seeds for sale at any reputable U.S. seed bank fall into a few main categories that change what your grow will look like.
Growers weighing autoflower vs feminized seeds usually land on autoflowers when they want a shorter, predictable timeline. Most autoflower cannabis seeds sold today are also feminized weed seeds, which means the plant will almost always grow female and omit the sexing step.
Skipping the check for male and female plants is one of the workflow shortcuts feminized autoflower seeds give a grower.
