How Long Does It Take to Grow Weed Indoors?

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by Nebula Haze

This is one of the most common questions we receive from curious soon-to-be indoor cannabis growers: How long does it really take to grow weed? What’s the growing timeline?

It’s actually a really good question! Every new marijuana grower should know how much work they’re signing up for! The short answer is…

The Average Indoor Grow Takes 3-5 Months

How Long Does It Take to Grow Weed Indoors?

How Long Does It Take to Grow Weed Indoors?

The long answer is: from Day 1 of your weed plant’s life to actually smoking your harvest, it can take… 8 weeks – 7+ Months! That’s a huge range, right?

That’s why most cannabis growers won’t give you a straight answer. The truth is, there are many factors will affect the total time until you have ‘ready’ buds, by days, weeks or even months. This includes your strain, your setup, and how big you plan to grow your plants (bigger plants need more time!). So instead of giving you a huge range, an easier-to-swallow answer might be to say that the average grow takes 3-5 months for indoor growers.

This includes the time needed to grow your cannabis plant from seedling to harvest plus an additional 2 weeks (minimum) which is needed to cure your cannabis buds after harvest.

Additionally, for at least the first time you grow, you also need to consider the time needed to get your equipment and seeds/clones.

This article will give you the total time breakdown, so you can plan out the details of your grow in order to achieve the harvest times you desire:

How Long Does It Take to Grow Cannabis? 3-5 Months on Average

How Long Does It Take to Grow Weed Indoors?

But Ultimately How Long to Harvest Marijuana Depends on the Yields You Want

How Long Does It Take to Grow Weed Indoors?

Jump to the Section of the Tutorial You’re Interested in:

  1. Before You Start Growing Weed (0-4 weeks) – Get seeds and supplies so you’re set to start growing!
  2. Time Needed to Grow Weed, From Seedling to Harvest (8 weeks – 5+ months)
  • Germinate Your Seeds (1-7 days) – Learn about fail-proof methods to germinate perfectly in soil/coco or hydro.
  • Vegetative Stage (3 weeks – 8+ weeks) – In the vegetative stage, the cannabis plants are growing just stems and leaves. On average, most indoor growers vegetate their plants for 4-8 weeks. Seedlings are able to start flowering as early as 3 weeks from germination, but the resulting plants will be tiny. Most growers choose to let plants vegetate for longer because giving them more time to grow results in bigger plants, which tend to produce bigger yields as long as you have enough light to cover all the bud sites. That being said, you can still produce quite a bit of bud with a lot of small plants growing at once as long as you fill up your grow space.
  • Flowering Stage (5 weeks – 16+ weeks) – This is when plants start making buds. The length of the flowering stage depends heavily on the strain/genetics, with an average of about 8-12 weeks for most strains. Some strains are bred to have very short flowering stages (for example, most auto-flowering strains will naturally start flowering at around 3 weeks old and some are ready to harvest just 5 weeks later, for a total of only 8 weeks from seed!). Other strains can take months in the flowering stage before they’re ready to harvest. Typically, longer-flowering strains produce higher yields than short-flowering ones because the buds are exposed to more light-hours and have more time to fatten up, but that’s not always the case.
  1. Post-Harvest (This is when the smell/taste/look you love shows up) (3-4+ weeks) – After buds are harvested, they still need to be dried for a few days to a week, then placed in glass jars to “cure” for at least 2 weeks. This post-harvest processing dramatically improves the taste, smell and the perceived potency of the buds. It also reduces the chance of buds causing headaches or unpleasant “speedy” effects. Don’t skip this step! It will account for nearly 50% of your final bud quality! Learn how to dry & cure your buds to perfection.

If you choose the right strain, you could be smoking your own buds as soon as 3 months from germination!

Best Hydroponic Nutrients for Cannabis?

How Long Does It Take to Grow Weed Indoors?


Before You Start Growing Weed

Total preparation time needed: 0 days – 4 weeks

Here’s the breakdown…

How Long Does It Take to Grow Weed Indoors?Get equipment: 0 days – 2 weeks
This includes purchasing your equipment and/or waiting for it to show up in the mail. Once you have your marijuana growing supplies, you’ll need to setup your growing area and equipment. Depending on how you purchase your equipment and how quickly you setup, you could be ready the same day or in two weeks (after factoring in shipping time).

Check out examples of new grower shopping lists to learn exactly which supplies you’ll need.

Get seeds or clones: 0-4 weeks:
If you have instant access (like knowing a grower, or ordering seeds from a seed bank in your country), this should take only a little time. If you order from a seed bank overseas(especially US residents), expect a wait of about 2-4 weeks to get seeds.


Time Needed to Grow Weed, From Seedling to Harvest

Total growing time needed: 8 weeks – 5+ months

Here’s the breakdown…

Seedling Stage
Germinate your seeds: 1 – 7 days
Seedlings can sprout in as little as a day, but by 3-5 days they should be good to go. If you have access to clones, you can skip this wait.

Learn my fail-proof method to germinate your seeds in soil/coco or hydro.

How Long Does It Take to Grow Weed Indoors?

How Long Does It Take to Grow Weed Indoors?

Vegetative Stage
Vegetative Stage:  3 weeks – 2+ months.
The length of this stage is a matter of personal preference. Most cannabis plants need at least 3 weeks in the vegetative stage before they will start making flowers, but after that you get to choose how long your plant spends in this stage (unless using an auto-flowering strain), because you’re the one to ‘flip the switch’ and get your plant to enter the next life stage: flowering.

Wait, how do I switch my plant from the vegetative stage to the flowering stage?

When you start with a seed, even with an auto-flowering plant, you will always have at least 2-3 weeks of vegetative growth before any buds start forming no matter what you do. Growers generally allow their plants to stay in the vegetative stage from a few weeks to a few months.

The size your plant achieves in the vegetative stage has a very large effect on your final yields since bigger plants produce more bud sites than smaller plants. However, you need enough light to cover all the bud sites or they will never develop properly. Light is like food for bud growth!

These vegetating plants are about 4 weeks old from germination

How Long Does It Take to Grow Weed Indoors?

To give you an idea as to what your FINAL marijuana plant may look like depending on how long it spends in the vegetative stage…


How Long Does It Take to Grow Weed Indoors?

← This plant didn’t spend any time in the Vegetative Stage. It was given 12-12 lighting almost immediately after sprouting. It’s so small that it spent its whole life in a solo cup, and its only light came from CFLs. I weighed down the bottom of the cup so it didn’t fall over. It ended up yielding about 0.75 oz.





How Long Does It Take to Grow Weed Indoors?

← These auto-flowering plants spent about 3 weeks in the vegetative stage before they automatically started flowering, and were ready to harvest just 5 weeks later. They were about a foot tall at harvest and yielded approximately 2 ounces each. Read the step-by-step tutorial to grow plants exactly like this.



How Long Does It Take to Grow Weed Indoors?

← This plant was grown under an LED grow light and spent about 4 weeks in the vegetative stage (like the picture of those vegetating plants above), with some plant training to create a well-managed canopy. Try to grow a wide, flat plant as opposed to a tall one to make sure all parts of the plant are getting equal access to the light! This plant yielded about 3 ounces.





How Long Does It Take to Grow Weed Indoors?

← This marijuana plant spent about 6 weeks in the vegetative stage before being changed over to flowering and yielded just over 6 ounces at harvest. View the complete grow journal with instructions on how to grow your plant so it looks just like this at harvest!

Should I grow weed?





How Long Does It Take to Grow Weed Indoors?← These cannabis plants were vegetated for about 8 weeks before being flipped to the flowering stage. Although they were grown in the exact same conditions from seed to harvest, their final heights are remarkably different because their strains had vastly different genetics. The smaller plant produced 6.6 ounces, while the big plant produced 9.3 ounces. Strain can make a big difference! Learn about growing different strains together.




How Long Does It Take to Grow Weed Indoors?

← These cannabis plants were vegetated for about 9 weeks before being flipped, in the exact same setup as above, and produced over 10 ounces each. Besides an extra week of veg, the biggest difference between this grow and the one above was simply the strains.







How Long Does It Take to Grow Weed Indoors?

← This huge plant (one of my very first plants) spent a little more than 3 months in the vegetative stage before I realized I needed to turn it over to the flowering stage. It then spent another 12 weeks in the flowering stage before it was ready to harvest because it was a long-flowering strain. It got way too tall for its space (taller than me!) and started falling over. However, despite the huge size and more than 5 months of growth, it only ended up yielding about 6 ounces. This is because it was under weak CFL grow lights. Though there was a lot of buds, the lack of strong light made them airy, without a lot of weight. Click the picture for a close-up. ????

Some people put their seedlings or clones right into the flowering stage if they want to harvest quickly though this makes for extremely small plants. For example, super-stealth growers who are growing in small hidden spaces – like out of a computer case – would want to put their seedlings into flowering nearly right away to keep their plants as small as possible.

I personally recommend at least 4 weeks in the vegetative stage with 18+ hours of light each day for the best results. Plants that are forced to start flowering sooner than 4 weeks don’t yield much compared to how much work you put in. That being said, keeping plants relatively small does have some benefits!

A good rule of thumb…

Your plant will likely double in size (or more) from when you first put it into the flowering stage; this is known as the Flowering Stretch. So make sure you end the vegetative stage before your plant reaches half the final height you want, or your cannabis plants may outgrow your grow space during the flowering stage!


Flowering Stage
Flowering Stage: 5 weeks – 16+ weeks

Here’s the breakdown…

Flowering Stage Timeline (Complete Flowering Stage Tutorial)

  • Week 1-3 – Transition to Flowering
  • Week 3-4 – Budlets Form
  • Week 4-6 – Buds Start Fattening Up
  • Week 6-8 – Buds Ripen, Pistils Darken – some strains spend longer in this stage
  • Week 8+ – Flowering Ends, Final Flush, Harvest

The length of time needed to stay in the flowering stage depends heavily on the strain. Once you have switched your plant into the flowering stage they will stretch (the ‘flowering stretch’), form buds and then fatten.

Looking for something special? Learn how to find the right strain to grow

Here’s a list of some of my favorite and best cannabis strains by length of flowering period:

Short (6-8 weeks)

  • How Long Does It Take to Grow Weed Indoors?Papaya <— View grow journal
  • Northern Light <– Known for being especially easy to grow
  • CBD Critical Mass <– High-yielding, medical, high-CBD strain
  • Frisian Dew <– One of the best strains for outdoor growing (and buds may turn pink or bright purple!)
  • Auto-flowering Sour Diesel <— One of the strongest auto-flowering strains I’ve tried so far. View grow journal
  • If you’re interested in a very short flowering time, most auto-flowering strains are ready to harvest less than 3 months from seed.

Medium (8-12 weeks)

  • Wonder Woman <— Probably the highest yielding strain I’ve ever grown. Consistently gets multiple ounces more than other plants in the same setup. View grow journal
  • Original Amnesia <— Strong effects and very easy to grow. View grow journal
  • Supreme CBD Durban <– Medical strain, has a THC:CBD ratio of 1:1
  • Pineapple Chunk <– An award-winning strain that’s fruity, vigorous and potent! Its yields are on the lower side, but I believe it’s worth it for the quality of buds.
  • Liberty Haze <– An award-winning strain that’s curiously strong and one of the few “haze” cannabis strains that doesn’t take forever to finish flowering. Good yields!

Long: (12-14+ weeks)

  • Almost any Haze strain, including one of my all-time favorites, Haze 1
  • Some Sativa strains, especially ones meant for outdoors near the equator
Why Beginners Should Grow Auto-Flowering Strains

How Long Does It Take to Grow Weed Indoors?In general, most strains (besides auto-flowering strains) are in the mid-range as far as how long they take to flower.

It’s not exact – There’s a 2-3 week harvest window for most plants, and keeping your plants in the flowering stage for a bit longer tends to increase your yields. This is because the plants tend to really bulk up their flowers once they’ve become ‘ripe’.

So often times, even though you could harvest at the shortest recommended time, waiting an extra week or two will give you an extra 10-30% more yield compared to harvesting early.

Note: Before you start trying to grow a 6-week plant, consider that it will produce just a few grams of smokable harvest. With a 4-week vegetative stage, the time from seed to harvest averages 3-3.5 months, but the yields can increase from a few grams to double-digit ounces.

How Long Does It Take to Grow Weed Indoors?


Post-Harvest (before you smoke you should do this stuff too)

Total post-harvest time needed: 2.5 weeks – 1.5+ months

Drying: 3 – 10 days
Good marijuana buds can be dried in as little as three days, but ideally, drying should be a slow process taking up to 7-10 days. Making sure your plants have been thoroughly dried (but not over-dried) will lower chances of mold during the curing process.

Curing: 2 weeks – 1+ months
Curing really seems to make the effects of buds feel less ‘speedy’ and be better suited to medical applications like treating anxiety, reducing pain, and improving feelings of depression.

Additionally, curing gets rid of the ‘cut grass’ smell, harsh taste and other undesirable traits of freshly dried buds. Over time with proper curing, those traits will be replaced by the ‘real’ smell and potency profile of your buds.

Two weeks is considered the minimum time to cure your buds, but I personally cure all my buds for a month or even a bit longer because the buds continue to improve for several more weeks.

So, after you’ve bought seeds and equipment, grown a plant from seed to harvest, trimmed, dried and cured your buds, that brings us back to the original answer…

Total Time to Grow (and Be Ready to Use) Your Own Weed:
8 weeks – 5+ Months

Average Time to Grow (and Be Ready to Use) Your Own Weed:
3 – 5 months

How Long Does It Take to Grow Weed Indoors?

If you haven’t started growing your own weed yet, today is the day!

Read the complete guide to the basics of growing

How Long Does It Take to Grow Weed Indoors?

Get a shopping list of all the supplies you need to start growing today!


Jump to….

New Grower Shopping Lists – What You Need to Get Started

Organic Super Soil Guide – Just Add Water

How to Yield 4-7+ Ounces with a 250W – Step-by-Step Instructions from Seed to Harvest

How to Train Your Plants for Bigger Yields – Free Way to Increase Your Harvest!

7 Tips for Growing Top-Shelf Buds – How to Grow Better Cannabis than the Dispensary!



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