Stages of Growing Weed 101 - The Top Things You Need to Know (2024)

Weed is a highly complex plant in comparison to most considering it has distinct stages of cannabis growth stages. Unlike other plants that typically grow with just sun, soil, and water – each weed plant stage requires its own specific protocol of nutrients, light, and environmental conditions to survive and thrive. Which makes knowing these stages of cannabis growth from the start that much more crucial for the overall health of your plants. That’s why we’ve put together the ultimate guide to the stages of growing weed with all the information you need to know for success.

The Germination Stage

As the saying goes, ‘it all starts with a seed’ which holds true for cannabis growth stages.

Unless of course, you’re beginning crops with clones, which is a cutting from a plant in its vegetative state. In that case – you can skip to that portion of the guide but for the most part, seeds still reign supreme especially for home grows.

First thing’s first, you’ll want to ensure the seed you’ll be germinating is viable. If you’re unsure of the quality or viability of seeds there are a few telltale signs to check for. Healthy seeds should be brown in color with visible stripes, and shouldn’t feel weak or be white or green. If you’re waiting to germinate your seeds, or storing them for future crops, be sure to keep them in a cool, dark space like a refrigerator or cooler area of your home.

The act of germinating seeds promotes the ‘popping’ of the initial seedling. This initial sign of life is the plant’s taproot that will take hold in your chosen medium. While some growers do just toss a seed in soil and hope that it takes, germinating the seed before the seedling stage is the best way to guarantee your seed takes life. In the germination stage seeds need –

• A warm temperature
• Humidity
• Air
• Water

One common way to nurture germination with these factors in mind is a method that requires a couple of plates or a ziploc bag and a paper towel. Slightly dampen the paper towel and fold it in half once or twice. Place the seeds inside the paper towel, and fold the other half over them. You can then place the paper towel in a plastic bag, and store it somewhere dark. Or, between two plates works as well.

In general, you can expect to see your seeds pop in 3-10 days making that duration the entire length of time for the germination stage. Every day or so, check back on the seeds to see if the taproot has emerged and once it has – you’re ready to move onto the cannabis seedling growth stage. So, let’s cover that more in-depth, next.

The Seedling Stage

For the start of cannabis seedling growth, you’ll place the germinated seed and taproot into your medium of choice. It’s ideal to use a small pot size for seedlings with adequate drainage for optimal results. To keep it simple, many growers use solo cups with holes in the bottom during this stage of growing weed.

Once the seed is in its growing medium, soon the growth of cotyledons AKA the first oval-shaped leaves will emerge. From there, upon providing the optimal conditions for seedling growth you’ll notice serrated leaf growth. Over the next three weeks, the seedling will continue growing new leaflets until digitate leaves sprout which are the more recognizable ‘fan leaves’ you’d expect from cannabis plants.

When plants are in the early seedling stage it’s imperative to provide an environment that’ll nurture optimal health. Because cannabis seedlings are more sensitive in this stage, they won’t require as many nutrients to start but will benefit from the following –

• Water with pH levels ranging between 6 – 7
  • Pro tip: Use a spray bottle to water young seedlings to avoid overwatering.
• Warm temperatures ranging between 71 – 80℉
• Relative humidity kept between 65 – 80%.

In regards to lighting, cannabis seedlings benefit from lower intensities of light with a blue spectrum if possible. As for light cycles, seedlings thrive with 18 hours of light and 6 hours of darkness to optimize photosynthesis for healthy, overall growth. It’s best to keep lights around 24-36 inches away from the top of the seedling, to avoid burning, but also close enough to provide optimal levels of energy.

Due to the delicate growth of cannabis seedlings they can be highly susceptible to mold. To avoid any mold issues, it’s recommended to keep the area free of excess moisture and as clean as possible. Last but not least, as cannabis seedling growth progresses the level of nutrients should be slowly increased. This increase in nutrients is vital to the transition of seedlings to vegetative plants, which we’ll cover next.

The Vegetative Stage

The vegetative stage of marijuana may be less thrilling than flowering but is just as important for maximized yields. That’s because the veg period is spent bolstering the plant for strong, healthy growth to support the buds you’ll soon be harvesting. To continue favorable environmental conditions, here are a few controls to keep –

• Warm temperatures ranging between 71 – 79℉
• Relative humidity kept between 40-60%
• Watering with pH levels between 6 and 7
• Increased airflow, and CO2

A part of the process in strengthening the plant is providing adequate levels of nutrients, with an increase of nitrogen, and establishing a regular feeding schedule. In addition, you’ll want to allow your roots the room to grow which requires the transplanting of your plant into a bigger pot. Without transplanting, your roots can become rootbound. Rootbound is a condition where roots hit the side of the container, and begin circling. If the circling continues, the roots can choke themselves which significantly deters plant health or kills it altogether.

Some growers will transplant their veg plants into a medium-size pot and then transplant once more before flowering. While others will wait until their veg plants are big enough, and transplant into the final flowering container size just once and avoid the extra step. Each method is appropriate and the decision ultimately depends on the grower’s preference, budget, or size of the room.

For light cycles, the veg stage of cannabis growth continues to require 18 hours of light with 6 hours of darkness for photosynthesis purposes. Plants will also continue to benefit from higher spectrums of blue light during vegetative growth, which can promote even node spacing, and canopy uniformity. Because each stage of marijuana growth benefits from different spectrums of light, LEDs are quickly becoming the preferred grow light setup for their full-spectrum capabilities.

While it’s important to monitor the plants closely in every cannabis growth stage, a close eye is even more crucial during the vegetative period if growing with a regular or non-feminized seed. As you may know, cannabis plants are dioecious meaning they can be male or female in sex. However, female cannabis plants are the ones that produce high levels of cannabinoids, like THC that are associated with high-quality crops. So, the veg stage is when growers determine if plants are female or male, discarding any males that pop up immediately to avoid pollination. Typically, plants will show their sex around the 6-week mark for reference.

All in all, the veg cannabis growth stage typically lasts anywhere from 4-8 weeks. But just because a plant can go into flowering at 4 weeks – doesn’t necessarily mean it should. By doing so you can risk growing a smaller plant than originally intended. The transition from veg to flower will depend on the strain, and upon the specific plant’s health or stature hence the variation in the estimated time range. Ultimately, growers will decide when individual plants or crops are big and strong enough to support the flowering stage of growing heavy buds, themselves, or go based on strain history.

In fact, – the vegetative stage of marijuana growth can go beyond 8 weeks, and even perpetually. Many commercial growers will keep ‘mother plants’, or varieties forever in veg that have stable, consistent, and trusted end-results. This is where the art of ‘cloning’ also comes into play, as they can ‘clone’ the variety over and over with successful results and without the risk of unknown genetics or phenotypes.

But how? Plants can be kept in their vegetative stage because cannabis is photoperiod in nature. Meaning, the species requires specific periods of light and dark to begin blooming or flowering. So, without further adieu – let’s move on to the flowering portion of our weed plant stages guide to learn more.

The Flowering Stage

Finally, we get to the stage of growing weed when the magic happens – the infamous flowering period. The flowering weed plant stage begins when light cycles of 12 hours of light, and 12 hours of dark get initiated. This occurs outdoors when the days become shorter towards Fall, and indoors when growers set specific schedules of light. During the flowering stage of marijuana growth, here are a few key factors to maintain –

• Warm temperatures ranging between 65-79℉
• Relative humidity ranging between 40-50%
• pH levels ranging between 6 and 7
• Maintain airflow, and increase CO2

Lighting is more intense during the flowering stage and a red spectrum is beneficial for the growth of plants. Flowering plants will also benefit from another increase in nutrients, and during the final weeks, growth can be supplemented with the addition of ‘bloom’ solutions that have ample amounts of phosphorous.

Flowering cycles will differ upon the strain but ranges from 8-12 weeks. During this time, there are a few distinct periods of growth, including –

1. Flowering initiation (week 1-3) – With new light cycles and amplified light intensity, plants spend the flowering initiation period growing and stretching in size. In this stage, plants often double in size and begin showing signs of flowering like the emergence of pistils, or white hairs. Reaching week 4, bud sites will begin to appear in the nodes of the plant, where the main stem and branches meet.
2. Mid-flowering (weeks 4-5) – In weeks 4 and 5, plants stop stretching and growing in size and stature and begin packing on weight instead. It’s important to maintain regular and adequate levels of nutrients during the mid-flowering stage of growing weed as this is when the development and production of cannabinoids and terpenes are strongest. The extra strength is also helpful for the fattening of buds, which can be supported by trellis’ or staking and tying. Near the end of mid-flowering, pistils will also begin to darken as the cannabis life cycle matures.
3. Late-flowering or ripening (weeks 6+)- The final weeks of ‘ripening’ in late flowering is when the flower buds gain the most weight, making the additional support measures that much more important. Especially considering plants can bend and break from bud weight. This is also the weed plant stage when that sticky-icky crystal coating of resinous trichomes becomes more established. These trichomes also play a pivotal role in deciding when to harvest, as their transparency and coloring change as the stages of marijuana growth progress. The flower’s pistils will also transform in color, and curl inward near the end of growth, too.

When the plant is nearing the end of its cannabis life cycle – flushing is recommended as one of the final steps during the flowering stage. Flushing refers to only watering your plant for the last week or two. Essentially, this ‘flushes’ out nutrients by triggering the plant to use the nutrients leftover in the plant – a crucial step in finishing the flowering stage and increasing plant senescence. Without this step, plants can be less aromatic or harsh upon puff, puff, passing.

After flowering and flushing, come the final stages of growing weed which is the harvesting of plants, along with the drying, and curing of buds. For more detailed information on the post-growth cannabis life cycle, including when to harvest, and how – we’d recommend checking out our complete guide to growing indoors.

Nourish to Flourish – The stages of growing weed

While the stages of growing weed differ greatly there’s one important thing to remember for each – you’ve got to nourish to flourish. Meaning, with each cannabis growth stage, the plant requires a specific routine of nutrients, lights, and environments for optimal growth and health.

Even though the cannabis life cycle may be somewhat tricky to master for beginners, with the information you gained today you’ll be on autopilot for managing weed plant stages before you know it.

So, keep staying in tune with all the latest knowledge on navigating the stages of cannabis growth, and providing your plants with the TLC they need. Stay connected to Scynce for more grower tips and tricks by following us socially or signing up for our email newsletter today!