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How Long Does It Take To Grow Weed?

by Fred Hernandez - - 03/16/2021
How Long Does It Take To Grow Weed?
December 9, 2018 by Fred Hernandez

How long does it take to grow pot? Marijuana plants.
How long does it take to grow weed?

How long does it take to grow weed is a very commonly asked question. Usually it takes about 3-4 months to grow the average cannabis plant – but with the right tools and strategy, you can grow the weed plant you want in as little as 8 weeks. Let’s take a look at the breakdown of growing cannabis indoors and the time needed for each step.

Weed Growing Timeline
The timeline below lays out a seven-stage process of a typical grow schedule. If you’ve been searching online for “how long does it take to grow weed?” you’ve likely run into a range of time periods. Generally, a marijuana plant can take 14 to 32 weeks to grow, which translates into about four to eight months to grow. This is for growing a marijuana plant from seed.

The length of time it takes to grow a weed plant can be broken down into multiple phases from seed to harvest:

Getting your equipment (1 day to 2 weeks)
Getting your clones or seeds (1 day to 4 weeks)
Germinating your seeds (12 hours to 8 days)
Seedling phase (1 to 4 weeks)
Vegetative phase (2 weeks to 6 months)
Flowering phase (6 weeks to 3 months)
Harvesting phase (1 to 3 days)
Step 1: Getting your equipment = 1 day to 2 weeks
If you know what you are looking for then this could happen quickly. We will help you with this later on as we set up the grow-rooms and do some grows with different styles and grow mediums.

Step 2: Getting your clones or seeds = 1 day to 4 weeks
Getting clones (cuttings from healthy mother plants) is easy to do in areas that allow cannabis cultivation. But in states or countries where it is illegal to grow, obtaining healthy clones can be a challenge. Seeds, on the other hand, can be ordered on the internet and generally take 2 to 4 weeks before they arrive by mail.

Step 3: Germinate The Seeds = 12 hours to 8 days
If starting with clones this can be skipped. The average time to germinate is 2 or 3 days. Make sure to check your seeds every day because seedlings can sprout in as little as one day. You’ll know your seed has germinated when your seed has popped and displays a tap root formation.

Check out our guide on the best method to germinate marijuana seeds using paper towels and water.

Step 4: Seedling Phase = 1 week to 4 weeks
Once again, can be avoided if using clones and not seeds. As your cotyledons begin to take shape, so will your cannabis leaves in a single leaflet form. Generally, growers can give their seedling a light amount of nutrients after the third set of leaves begins to appear.

Step 5: Vegetative Phase = 2 weeks to 6 Months!
Yes, that is correct. This stage in the plants life has a huge fluctuation in how long it needs to take. You, as the grower, hold all the power and get to choose how long this phase is. Once you change the light cycle that the plant receives to 12 hours of light, and 12 hours of darkness per day, the plants will switch to the next phase, which is flowering.

If you want to, you can switch the lights to 12/12 right away and force your plants to flower! The sooner you change to 12/12, the faster your plants will flower, and the sooner you can move on to the next crop. But, keep in mind, the less amount of time you keep your plants in the vegetative phase, meaning getting at least 18 hours of light per day, the smaller your plants will be, and the less marijuana you will have to use. If you are concerned with how big your plants will grow, maybe because you only have a small space to grow in, you can grow cannabis that only grows only a few inches tall, and you could even grow it the entire time in a little plastic cup if you wanted to!

Keep in mind that buds do not form for at least 2 to 3 weeks in the vegetative phase when beginning with seeds. Most growers allow their plants to stay in the vegetative stage from a few weeks to a few months so they get big enough and will end up with a sizable harvest. Bigger plants produce more buds! But, many growers choose instead to grow small plants and to harvest more often with smaller yields each time. We recommend at least 3 weeks or more in the vegetative stage with at least 18+ hours of light each day for optimal yields. Even 24 hours of light per day is sometimes better, with certain strains.

The more light, the more buds!

Keep in mind that cannabis plants usually double in size from vegetative phase to when they are done flowering. This means is sometimes best to change to 12 hours of light and 12 hours of darkness once the plants are one-half the size that you feel your grow room has adequate space for.

During the vegetative phase, you can use a number of cultivation training techniques such as super cropping, crimping, topping, tying, bending, sea of green (SOG), screen of green (SCROG), and trellising to alter the growth, direction, height, and quality of your crop.

Autoflowering strains, however, have a different vegetative time period than regular feminized seedlings. Autoflowering strains will have at least two to three weeks of vegetative growth before they automatically start showing any bud formations regardless of photoperiod.

Step 6: Flowering Phase = 6 weeks to 3 months
In nature, cannabis plants start to flower in the fall months, when they are receiving less light. The decrease in light signifies to the plants they are nearing the end of their life cycle and its time to begin flowering.

Indoors, this action is done by changing the amount of light the plants receive to a schedule of 12 hours of light, and 12 hours of uninterrupted darkness. The plants will require less nitrogen during this time than they have had in the previous vegetative phase. The needs for phosphorus and potassium will increase, so you will now use a nutrient with a higher P&K ratio. If at this time you still are not sure if the plants have revealed the sex or not, they will in about 7 to 10 days after being in the 12/12 light cycle. Look for two white hairs coming out of the nodes on the plants. These hairs are the pistils that are found on the females.

Most cannabis plants flower for around 8-14 weeks. Depending on the strain, some may flower a lot longer than others. Pure indica strains usually finish around 8 weeks of flowering, while pure Sativa strains usually finish around 12-14 weeks. Some Sativa strains have been known to flower for 16 weeks or longer. For this reason, indica strains are most commonly the kind that is grown indoors.

Most growers like to grow, harvest, sell, and get back at it as quickly as possible to turn a faster profit. If you are not in it for the profit, sativa strains can be fun to grow. You could let them grow real big and tall if you have the ceiling space or outdoor area for them. Make sure to research the strain your growing so you have a general idea of the flowering time.

Autoflowering strains can have a short flowering stage and begin to flower after just three weeks. Autoflowering strains can be ready to harvest 5 weeks after. That means that you can grow an autoflowering seed in just eight weeks.

Keep a close eye on any new sex organ formations to determine the sex of your plants within the first two weeks of flowering. You will be able to tell whether your male plant needs to be carefully extracted from the grow site or whether you have a female on your hands. It’s important to separate the males from the females to prevent the pollination of females.

Pruning too early into the flowering stage can affect the hormones of the plant and the number of buds produced.

Ultimately the flowering phase will depend on the genetics of your strain.

Fast-flowering strains can grow in a period of between six to eight weeks. Fast-flowering strains include:

Girl Scout Cookies (GSC)
OG Kush
Original Glue (Gorilla Glue #4/GG4)
Jack Herer
Green Crack
Granddaddy Purple (GDP)

A medium flowering growth rate can take between eight to 12 weeks. Most strains will have a medium flowering time. Medium-flowering strains include:

Blue Dream
Sour Diesel
Wedding Gelato
Strawberry Lemonade
Pineapple Chunk.

Long flowering times between 12 and 14 weeks occur in most sativa, landrace, and Haze strains. Long-flowering strains include:

Colombian Gold
San Fernando Valley OG
Chocolate Thai

Step 7: Harvesting = 1 to 3 days

Harvesting times can vary depending on your strain’s height, yield, and overall quality, as well as your experience with drying, curing, and trimming. Quality cannabis buds can dry in about four days but usually take a week or more for a slow and full drying process. Your bud should be dry enough to avoid mold, but not too dry.

Curing can take anywhere from a couple of weeks to a little over a month. Some users may leave their cannabis curing for up to two months or even six months for some strains. Curing is another long and slow process intended to maximize the effects of your bud, especially for medical users.

Trimming times can depend on your experience. Of course, hand trimming will be more time-consuming than using a commercial and automatic trimming machine, but hand-trimming produces more carefully manicured flower compared to the one-size-fits-all appearance of a machine trimmed crop.

Generally, a single person can trim about a half a pound in about 8 hours. That means that you need two full shifts, so to speak, to completely trim a pound of weed. A quarter of a pound can take about 3 hours. For slower trimmers, one ounce per hour is the average. Using a household trimming machine can cut down you are trimming time in about half.

And that’s it! All you need to do is cure and trim and you’re cannabis is ready for use!

Marijuana Grower Certification
Are you looking to speed up your cannabis growing process? Do you want to cut your learning curve in half so you can start growing the best flower buds you’ve ever grown? Learn the most refined and effective techniques to grow your own weed from industry professionals at CTU.

Whether you’re growing in a closet, a windowsill, or a decked-out greenhouse, CTU provides you with online marijuana training covering every aspect of the cultivation process from choosing the best seeds to optimizing your harvest.

Make sure to enroll at Cannabis Training University, the top cannabis training school to learn how to grow marijuana like the pros!
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