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How Long Does It Take To Fully Grow A Cannabis Plant?

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Cannabis, a versatile plant with numerous applications, has been cultivated for centuries. As the demand for cannabis increases, so does the curiosity surrounding its growth process. One of the most common questions asked by aspiring growers is, “How long does it take to fully grow a cannabis plant?” In this comprehensive blog post, we will delve into the stages of cannabis cultivation, from seed to harvest, and explore the various factors that influence the timeline. By the end, you’ll have a better understanding of the time and effort required to successfully grow a cannabis plant.


The journey of a cannabis plant begins with germination. Germination is the process by which a seed develops into a seedling. It typically takes around 24 to 72 hours for the seed to crack open and reveal a taproot. The taproot grows downward into the growing medium, anchoring the plant and absorbing water and nutrients.

Seedling Stage

After germination, the cannabis plant enters the seedling stage. This stage lasts for about two to three weeks. During this time, the plant begins to develop its first set of true leaves and establishes a stronger root system. Seedlings require a controlled environment with proper lighting, temperature, humidity, and ventilation. Growers often use fluorescent or LED lights to provide the necessary light spectrum for healthy growth.

Vegetative Stage

Once the seedling stage is complete, the cannabis plant enters the vegetative stage. This stage can last anywhere from two to eight weeks, depending on the desired plant size and growth rate. During the vegetative stage, the plant focuses on leaf and stem development. It requires longer periods of light exposure, typically 18-24 hours of light per day. Growers can use various lighting sources, such as high-intensity discharge (HID) lamps or full-spectrum LEDs, to promote vigorous growth.

Flowering Stage

The flowering stage is when the cannabis plant starts to produce flowers, also known as buds. The transition from the vegetative stage to the flowering stage is triggered by a change in light exposure. Most cannabis strains require a photoperiod of 12 hours of light followed by 12 hours of uninterrupted darkness to induce flowering. The flowering stage typically lasts between 6 to 12 weeks, depending on the strain and desired maturity level.

During this stage, the plant focuses its energy on bud development. Female plants produce resinous flowers rich in cannabinoids and terpenes, while male plants produce pollen for fertilization. To maximize flower production and quality, growers must carefully monitor environmental conditions, including temperature, humidity, airflow, and nutrient levels. Pruning and training techniques can also be applied to shape the plant’s structure and enhance light penetration.

Harvest and Curing

After the flowering stage comes the long-awaited harvest. The timing of the harvest is crucial, as it significantly affects the potency, flavor, and overall quality of the final product. Harvesting too early can result in underdeveloped buds with lower cannabinoid levels, while harvesting too late can lead to a decrease in potency and an increase in sedative effects.

The ideal time to harvest depends on factors such as strain, desired effects, and personal preferences. Typically, cannabis plants are harvested when the majority of the pistils (hairs) on the buds have turned from white to reddish-brown or amber. Trichomes, the tiny resinous glands on the buds, are also examined under a magnifying glass to determine the optimal harvest time. When the trichomes have turned cloudy or milky white, with some amber trichomes indicating maturity, it’s a good indication that the plant is ready for harvest.

Once the plants are harvested, the next important step is curing. Curing involves drying the harvested buds slowly and carefully to remove excess moisture while preserving the cannabinoids, terpenes, and flavors. Proper curing can take anywhere from two to four weeks. During this time, the buds are typically hung upside down in a dark, well-ventilated room with controlled humidity levels. This process allows the buds to dry gradually, which improves their aroma, potency, and overall smoking experience.

It’s important to note that the total time from seed to harvest can vary significantly depending on multiple factors, including the strain, growing conditions, and cultivation techniques. Some cannabis strains have shorter life cycles and can be harvested in as little as eight weeks, while others may take up to 16 weeks or more. Additionally, outdoor cultivation may have longer growth periods due to seasonal changes and natural light cycles.

Furthermore, certain cultivation methods, such as hydroponics or high-stress training (HST) techniques like topping or scrogging, can expedite or extend the growth cycle. These methods can influence plant size, yield, and overall development.


In conclusion, the journey of a cannabis plant from seed to harvest is a fascinating process that requires patience, knowledge, and careful attention to detail. While the exact time it takes to fully grow a cannabis plant can vary, a general timeline can be established. From germination to harvest, the entire process can take approximately three to six months, with each stage having its own specific duration and requirements.

Whether you’re a novice grower or an experienced cultivator, understanding the growth stages and factors that impact cannabis cultivation is crucial for successful and rewarding results. By providing the right environment, nutrients, and care throughout each stage, growers can maximize yields, potency, and the overall quality of their cannabis harvest. Remember, growing cannabis is both an art and a science, and with time and practice, you can develop the skills to nurture thriving plants and enjoy the fruits of your labor.

For actionable steps and tips related to Cannabis growing, explore our posts on Easy Cannabis Strains for New Growers, How Long Does It Take To Fully Grow A Cannabis Plant?, and From Clone to Harvest: Understanding The Journey of Cannabis to gain practical knowledge.

If you’re interested in learning more about benefits of Cannabis, check out our in-depth guide on 50 Surprising Benefits Of Cannabis.

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