Chocolate Rainbow XXL Feminized

Chocolate Rainbow XXL Feminized

Discover the expert growing techniques that can help you achieve a bountiful yield. Our comprehensive grow report on Chocolate Rainbow XXL Feminized provides valuable insights into the ideal growing conditions and techniques. With our report, you can learn from the experts and optimise your growth for a successful and productive harvest.

Flowering stage: 62 days

Total time, seed to harvest: 91 days

Final yield: 105 grams

THC content: 21%

Chocolate Rainbow XXL Feminized was developed by Sensi Seeds in 2024. The genetics were carefully chosen from a cross between GMO and Gelato 41, resulting in a unique and flavourful strain. We cannot wait to tell you more about our experience growing Chocolate Rainbow XXL in our indoor growing area.

We cultivated our Chocolate Rainbow XXL Feminized using BAC Lava Soil mix and provided it with Bio Grow and Bio Flower nutrients. Throughout the growth process, we maintained the pH of the final solution at 6 and gradually increased the EC as the root system expanded. During the vegetative stage, the lights were on for 18 hours and off for 6 hours, while during the flowering stage, they were on for 12 hours and off for 12 hours.

We enhanced indoor air circulation by using several fans above and below the canopy. Inline fans are placed in specific locations to eliminate stagnant air, while a carbon filter helps to eliminate unwanted odours. The 1000W Phillips HPS lights were mounted on the ceiling, 3M above the soil. The temperature was consistently kept at 24°C when the lights were on and 21°C when they were off. We gradually decreased humidity throughout the cycle, starting with 65% for our seedlings.

Germination & seedling

To initiate the cultivation process of Chocolate Rainbow XXL Feminized, we began with germination. Firstly, we placed the seeds in a damp paper towel and kept them in a warm, dark environment. We carefully monitored the moisture levels to ensure that the paper towel remained damp but not too wet. After some time, the initial tap root emerged, indicating that it was time to transfer the seedling to a small rock wool cube.

We utilised BAC Lava Mix, a premium soil mixture enriched with nutrients and well-draining to promote optimal growth. During the transplanting process, we took great care to dig a small hole about one inch deep, ensuring that the seed was placed into the hole with the taproot pointing downwards, which is the optimal position for growth. Finally, we covered the seed with a thin layer of soil, providing it with the necessary nutrients and protection.

We closely monitored our plant’s nutrient solution’s electrical conductivity (EC), which maintained a stable 0.8. Recognising the delicate state of the roots, we decided to supplement 100 ml of water to ensure optimal hydration and support for the developing root system. As the week progressed, the plant exhibited promising signs of growth, and by the week’s end, it proudly stood at a height of 4 cm.


Now that our seedling has established its first set of true leaves, it is time to introduce a mild nutrient solution to help it grow strong and healthy in week two. We will also ensure it receives ample light while maintaining proper humidity and ventilation to create the optimal growing environment. As the plant had outgrown its current container, we carefully transplanted it to a larger 5-litre container to ensure its roots had enough space to develop properly.

We prioritise a proactive approach to pest management, utilising organic methods that involve beneficial insects. As a preventive measure, we hang sachets containing Neoseiulus Californicus and Amblyseius Swirskii on the lower lateral branches. These predators have proven highly effective in preventing thrips, fungus gnats, and two-spotted spider mites infestations. By implementing this approach, we ensure a healthy and thriving garden, free from unwanted pests!

Throughout the week, we closely watched the EC levels of our Chocolate Rainbow XXL. We observed that they had increased to 1.4, which was a clear indication that the plants required additional nutrients to support their growth. As our plant had reached 14 cm, we added 200 ml of water to the nutrient solution, which helped lower the EC levels and provided our Chocolate Rainbow XXL with the essential nutrients needed to thrive.

In the third week, we gave our plant Bio Bloom, a specially formulated fertiliser for the vegetation stage. A balanced N-P-K ratio of 3-1-2 or 2-1-2 is ideal for this stage, as it promotes healthy leaf growth and strong stems. Remember that different plants may require different nutrient levels, and it is always best to follow the manufacturer’s instructions for the best results. Our EC remained at 1.4, and we increased our water intake to 400 ml. By the week’s end, our plant had reached 21 cm.

Providing your plants with the proper nutrients during the vegetative stage will set them up for success during the flowering stage and ultimately achieve a successful harvest.


In week four, we altered our light cycle to a 12-hour light/12-hour dark schedule, which imitates natural conditions that indicate the plant will start flowering. The initial week of the flowering stage is a critical period for cannabis plants, and it denotes a significant change in the plant’s growth, shifting from vegetative growth to the development of flowers. We switched to bloom nutrients to provide the increased phosphorus and potassium needed for optimal bud development.

We also made some significant developments in our plant’s nutrient management. One of the notable changes was the increase in our EC levels, which reached 1.7. This adjustment was made to meet the plant’s evolving needs during this critical stage. Additionally, we provided the plant with 800 ml of water to create a balanced and supportive environment for the growing flowers. By the end of the week, the plant had grown to a height of 32 cm, a promising start!

During the fifth week of our grow cycle, we closely watched our Chocolate Rainbow XXL for any signs of stress or nutrient deficiencies. As the plant matured, we could distinguish its gender more clearly. We observed two hair-like pistils, known as pre-flowers, starting to develop in the upper nodes of the plant. These pre-flowers mark the beginning of the plant’s reproductive phase and will eventually develop into buds.

It is essential to closely monitor the pre-flowers as they can provide helpful information about the plant’s gender. It has been four weeks since we placed sachets containing Neoseiulus Californicus and Amblyseius Swirskii on the lower branches. We added more sachets to reduce any potential risks from unwanted pests in our garden. We increased our watering to 1000 ml, and our EC levels increased to 1.8. Meanwhile, our Chocolate Rainbow XXL grew to a height of 49 cm.

During the sixth week of our Chocolate Rainbow XXL plant growth, we anticipated a rapid vertical expansion phase, commonly referred to as “stretch”, and our plant had reached 66 cm by the week’s end. Characterised by increased internodal spacing, our plant directs energy towards bud formation. As a result, some of our lower leaves turned yellow as nutrients were redistributed. Our EC increased to 1.8, and to support flower development, we increased the nutrient solution to 1500 ml.

The resin glands containing cannabinoids, known as trichomes, start forming on the flowers and leaves around them. At first, they appear transparent and glass-like. We closely monitored light intensity to avoid light burn on the large fan leaves. We followed a regular watering schedule of 1500 ml of nutrient solution with an EC of 1.8 and pH of 6, while our relative humidity remained at 60% until more bud development was visible.

We were excited to see the buds developing significantly in the seventh week, and our Chocolate Rainbow XXL had now reached 83 cm high. The buds were becoming more prominent and denser, while the trichomes, the tiny, hair-like structures on the buds, were becoming more prominent, giving the buds a frosty and sparkling appearance. We ensured the environmental conditions were stable, with consistent temperature and humidity levels, to ensure the plant continued to thrive.

During the eighth week of growth, the plants experienced a significant increase in foliage, and we had to perform some defoliation to allow better airflow and light penetration. As the stretch phase was ending, the plants’ energy was now directed towards the development of buds. This is a crucial time for the plants, as the buds begin to form and the plant starts producing trichomes. The stretch phase is slowing down, and our Chocolate Rainbow XXL is now focusing on bud development.

Our plant had reached a height of 101 cm by the end of the week. Despite the growth, we maintained our Ec levels at 1.8, and our water volume remained steady at 1500 ml. It is worth mentioning that the plant appeared healthy, with no signs of nutrient deficiencies or pest infestations. The leaves were vibrant green with no yellowing, browning, or curling. The stem was sturdy, and the nodes were well-spaced, indicating healthy growth.

As the ninth week drew to a close, it was apparent that the plant’s vertical growth rate had significantly slowed down and had only grown an additional 8 cm in height. However, what was truly remarkable was the transformation happening with the smaller buds. They were swelling and gradually merging with other nodal sites to create massive and dense colas. Witnessing the plant’s progress towards maturity was an exciting experience.

During the tenth week of growth, our Chocolate Rainbow XXL Feminized plants started producing buds and trichomes at an accelerated rate. Some of the bracts even formed foxtails with fresh white stigmas protruding from them. To accommodate the larger bud sizes, we decided to reduce the humidity in the room to 56%. After four weeks of not applying any beneficial insects, we inspected the trichome heads and added more Neoseiulus Californicus and Amblyseius Swriskii sachets.

We noticed that some stigmas were turning slightly brown, indicating that harvest may be approaching soon. However, we also observed that the bracts had not yet begun swelling, which is how flowers gain most of their bulk. Therefore, we knew the plant would not be ready for harvest next week. Our plant had now reached 126 cm.

We have been closely monitoring the development of trichomes on the buds to determine the best time to harvest during week eleven. Trichomes are the tiny, crystal-like structures on the buds that produce the cannabinoids and terpenes responsible for the plant’s effects and flavours. A good rule of thumb is to wait until they have turned slightly cloudy, indicating peak cannabinoid production. Based on the amount of amber, milky, and clear trichome heads, harvest would be within 14 days.

In addition to monitoring the trichomes, we have flushed our medium, helping to remove any excess nutrients or chemicals in the soil. Flushing can be a simple and effective technique for improving the final quality of the crop, and we highly recommend it to other growers. As the week ended, we were pleased to see that our Chocolate Rainbow XXL had reached an impressive height of 133 cm.

To start week twelve, we inspected the trichome heads again, and there was a significant proportion of amber and milky heads rather than clear heads. This was a natural indicator that our plant was almost ready to harvest, and we immediately cut out all nutrients from our solution. We flushed with 1,000 ml of pure water for the remainder of the grow and removed the run-off. After a few days, we saw a depletion of nutrients in some of the leaves, and our plant had increased by 4 cm in height.

As week thirteen rolls around, it is finally time to harvest the fruits of our labour. The buds are now entirely covered in a thick layer of resin, making them look swollen and glistening in the light. Thanks to the high anthocyanin content, the buds have taken on beautiful hues of purple, making them even more visually appealing. At harvest time, the plant reached a height of 137 cm and produced 105 grams of weighted buds.


We harvested our Chocolate Rainbow XXL by cutting it down at the stem and transporting it to our drying room. In the drying room, we closely monitored the environmental conditions, ensuring that the temperature stayed at 15.5°C and the humidity stayed at 60% to avoid mould growth. We then hung the plant in a well-ventilated and dark space.

We used small oscillating fans for air circulation, aiming the fans away from the plant to avoid direct airflow. This created a gentle breeze that helped to dry the plant further. We let it dry for 14 days in our dark, climate-controlled room. To test whether the dying process was complete, we bent a small branch to see if it would snap. It cracked slightly, indicating that there was still some moisture present. Finally, after drying for 21 days, the plant was sufficiently dry.

We carefully cut and trimmed the mature buds, removing any excess leaves. While handling the dense buds, we were cautious only to touch the stems to preserve the trichomes. After trimming the buds, we broke the main cola into smaller pieces to prevent excess moisture. After drying the buds, we started the curing process. We sealed them in containers and opened them periodically to let excess moisture escape.

We found that burping each jar a few times a day for two weeks and then leaving the lid off for an hour every day for the following four weeks improved the flavour and aroma of the final product. Once we balanced the moisture level, we stored our flowers in a C-vault for three months. The result was a yield of 105 grams of fragrant flowers that contained 21% THC with a terpene profile featuring myrcene, limonene, and caryophyllene.

Terpene profile

As we approached the end of the cycle, we could not help but notice the delicate hints of chocolate that tantalised our taste buds, which inspired the name Chocolate Rainbow XXL Feminized. We also experienced a subtle fragrance that became more pronounced during the flowering stage. After drying, the plants gave off a pungently sweet, floral aroma with spicy notes of diesel fuel, which further intensified during the curing process.

With a perfect balance of sativa and indica characteristics, Chocolate Rainbow XXL Feminized is a strain that stands out. The effects of Chocolate Rainbow XXL Feminized are incredible. After lighting up a joint, the high starts with an uplifting cerebral high that brings on euphoria, enhancing happiness, creativity, and mental clarity. As the high progresses, it slowly transitions into a profound body high that delivers muscle relaxation, making it an excellent choice for those early evenings.

The outcome

As a grower, nothing is as fulfilling as seeing your hard work and dedication pay off, and let me tell you, with our close attention to detail, we achieved some incredible results! We produced a high-quality yield of 105 grams that exceeded our expectations by monitoring the plant’s growth, providing a balanced nutrient regimen, and maintaining optimal growing conditions.

If you have any questions or tips regarding this grow cycle, please let us know in the comments below.

  • Disclaimer:
    Laws and regulations regarding cannabis cultivation differ from country to country. Sensi Seeds therefore strongly advises you to check your local laws and regulations. Do not act in conflict with the law.


1 thought on “Chocolate Rainbow XXL Feminized Grow Report”

  1. Wayne Gilbert

    Very good report I just thought the was a lack of flushing in this one as the normally get flushed every two weeks after week six!

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    The Sensi Seeds Editorial team has been built throughout our more than 30 years of existence. Our writers and editors include botanists, medical and legal experts as well as renown activists the world over including Lester Grinspoon, Micha Knodt, Robert Connell Clarke, Maurice Veldman, Sebastian Maríncolo, James Burton and Seshata.
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