Multiple factors like cannabis strain and growing method can determine the size of the plant after approximately 2 months.
To find the answer to how big should my plants be after 2 months, we need to examine the determining factors and the growth life cycle of a cannabis plant.
The typical time for a cannabis plant to start from germination to flowers harvest may take anything from 3 to 6 months.
Typically, under the ideal growing environment, the plant is almost ready to transition into the flowering stage after approximately 8 weeks (2months), reaching a height between 1 to 1.5 meters depending on the strain.
It’s also important to know how these governing factors interconnect with the plant’s growth cycle in order to predict the flower harvest size and turnaround time.
In this article, we’ll look at what factors determine the speed of the cannabis plant growth cycle and other factors that can greatly influence plant size during its short life cycle.
Growth rate for different types of cannabis strains
All cannabis plants can be categorized into the 3 main strains and referred to as Sativa, Indica, and Hybrid.
These 3 strains all have completely different growth rates which makes it close to impossible to predict a cannabis plant size after 2 months without knowing the strain.
Here is a quick overview comparison of the three stains to help shed light on the different growth rates associated with plant genetics.
100% Sativa Plants
Sativa strains are genetically bigger than other cannabis plants and can reach upwards of 10 feet (3m) skyward, making indoor growing difficult.
For any plant to become this massive size it required a lot of energy from sunlight and nutrition which is why the fan leaves are freakishly huge.
Although Sativa plants are giants amongst all strains, they typically yield skinnier-looking buds because of the hot humid climate the plant evolved in.
The Sativa strain is thought to have originated in the Southeast Asia region in areas that are near the equator.
Sativa Indoor flowering period: 10 – 12 weeks
100% Indica Plants
Indica strains can be easily identified by their short and wide appearance similar to an upside-down pyramid.
Another distinct characteristic of Indica strains is that they yield a much larger flower harvest which is typically any grower’s main goal.
While outdoor Indica plants can typically grow to approximately 6 feet (2m), indoor plants can be trained to be much smaller to about 3 feet (1m).
Since 100% Indica strains don’t waste valuable energy on growing tall, they tend to have a shorter flowering period than Sativa which makes them perfect for small grow tents at home.
Before you jump on the Indica train and start growing tasty cannabis plants like old Mcdonald, you might want to continue reading how some clever laboratory nerd created an indoor super stain perfect for small grow tents.
Indica indoor flowering period: 6-12 weeks
Indica and Sativa Hybrid
Hybrid strains plants are genetically altered by cross-breeding Indica and Sativa. Typically this Franckenstain baby will usually inherit only one of its parent’s growth patterns and size.
You will also hear people speak about a Sativa dominant or Indica dominant strain, which refers to the plant’s inherited parent characteristics.
Some clever laboratory nerds have developed multiple super hybrid plants by cross-breeding Indica and Sativa to channel all the best features of both parents to the hybrid.
These super plants are known to be extremely potent in THC with a shorter harvest turnaround time.
Fully matured, these plants typically grow to about 3 feet (1 meter) high and can be ready for harvest in about 2 weeks less than their Indica parents.
Hybrid plants are known to grow rapidly during the vegetative stage and need much less time in the flowering stage.
Hybrid Indoor flowering period: 6-10 weeks
4 Stages of the Cannabis Plant Life Cycle
Before your super skunk seedling can transform into the best flower-producing plant in the world, it first needs to pass through 4 stages to complete its life cycle.
Each stage requires a different environmental stressor that triggers the plant to complete a particular phase and begin the next.
However, just like the perfect climate can simulate the plant to enter into its next evolutionary life cycle, an undesired climate can have the opposite effect and force the plant into survival mode known as hermaphroditism.
It is important to understand each life cycle stage and how long the plant stays in each development phase in order to get a quality harvest.
The plant’s life cycle phase will also determine when to prune, train, trellis, and when to harvest, which if done at the incorrect time can also stress out the plant and trigger its survival mode.
While outdoors growing cannabis outdoors has an organic undeserved organic label attached to it, indoors often yield the most potent flowers in the quickest time because the grower has full control over the environmental climate.
Stage 1: Seed Germination
Seed germination length: 2-10 days
Indoor light cycle: 16 hours a day
Seed germination is the very first step in the cultivation process of cannabis which usually lasts between 2 to 10 days.
Preparation is the key to success in the development phase because poor seeds can produce a bad quality flower, and in some cases don’t germinate at all.
Luckily, there are a couple of warning signs to look out for when choosing healthy seeds.
Before planting the seeds, always closely inspect the seeds for irregularities in coloration and texture that might not be that obvious for new growers.
Healthy seedlings are protected by a dry hard enamel coating similar to our teeth, which makes the seeds more durable to easily withstand a good amount of pressure when pinched between your fingers.
A poorly-developed seed is usually soft and squishy which can be pressed flat with no effort at all.
You can spot these lame seeds usually by color as they are often a soft green and white color.
Once the seeds are sprouted, they are ready to be transferred to their final growing space like a soil pot.
Shortly after the infant plant gets comfortable in its new nutritious environment, the taproot gets strong enough to drive the stem upwards while growing the first cotyledon leaves.
These leases are vital for the overall development of the plant because they are responsible for absorbing sunlight to convert into plant energy.
As the stalk rises above the ground the first fan leave will start to appear, which is a sign that the plant entered into its next life cycle as a seedling.
Stage 2: Seedling
Seedling length: 2-3 weeks
Indoor light cycle: 16 hours a day
During the seedling stage, the baby plant is at its most vulnerable to diseases and needs a near-perfect environment to develop into a healthy plant.
These tiny plants are extremely finicky and require between 18 to 24 hours of sunlight at about 77 Fahrenheit with 60% humidity.
This perfect climate balance signals to the plant that its environment is comfortable and safe which in return trigger the plant to develop mature leaves.
While these preliminary leaves look nothing like the traditional leaves we all recognize, they’ll start to develop the iconic leaves within a couple of weeks.
The seedling stage continues until the plant develops mature fan leave which typically has 5 to 7 blades.
Although plants are known to rely heavily on their root system to absorb their necessary nutrition, cannabis mostly solely depends on its huge fan leave to obtain moisture and sunlight to convert into growth energy.
Once the plant developed mature leaves it has transitioned into the next stage of its life cycle.
Stage 3: Vegetative
Vegetative length: 3-16 weeks
Indoor light cycle: 16 hours per day
The vegetative state is the biggest growth phase of the plant’s life cycle, similar to a teenager transitioning into adulthood.
This is the stage where the plant focuses all its energy on maximum development and growth before transitioning into the final stage of flowering.
In order for the plant to mature into adulthood, it requires a lot of energy from nutrition and sunlight which ultimately predicts the quality of the flower harvest.
During the next 3 to 16 weeks the plant will rapidly expand in height and width forming a beautiful leave canopy that occupies as much space genetically possible for the stain.
In this accelerated growth phase the plant develops a thicker stem, many more branches, and fully fingered leaves to support its end goal of producing healthy flowers.
The growth maximizes the plant’s ability to produce quality buds because of its increased surface area which captures sunlight to convert into plant energy.
Growers using un-feminized seed also tend to be more vigilant and on the lookout for potential male plants that can ruin the entire crop if left to pollinate the females.
Only near the end of the vegetative stage once the plant reaches full maturity the sex organs can be identified to separate males and hermaphrodites from the female.
Stage 4: Flowering
Flowering length: 8-11 weeks
Indoor light cycle: 12 hours per day
The flowering stage is the final step of the cannabis plant to complete its life cycle.
For indoor growers, the plants can be transitioned into producing their flower gold with a switch of a button by changing the day and night time cycle length.
Once the cannabis fully transitions into the flowering stage the plant will focus all its growth energy on developing healthy buds with little white pistils.
Near the end of the flower ripening phase, you’ll notice and sharp increase of dank smells coming from the ripening buds which signal that harvest time is close.
You know that the plant is ready for harvest once the little white pistils (also known as trichomes) change color and become milky white because this is when the THC is fresh and at its most potent level.