Jamaican Pearl Feminized Grow Report

Flowering stage: 75 days

Total time, seed to harvest: 96 days

Final yield: 113 grams

THC content: 13.1%

Jamaican Pearl was initially created to provide Northern European growers with a chance to cultivate a tropical sativa that will flourish in colder climates. It is a cross of Marley’s Collie and Early Pearl. This delectable cultivar delivers euphoric and energizing effects with highly resinous buds and a unique palette of tropical flavours. It has been a fan favourite worldwide for decades, taking first place in the Supercup category at the 1999 Dutch Highlife Cup.

The 85% sativa lineage is visible in the many classic characteristics, including significant internodal gaps and elongated branches. The 15% indica lineage is evident in Jamaican Pearl’s posture; it is shorter and broader than most pure sativas, with a very dense bud structure. However, like most sativas, Jamaican Pearl has a long flowering period of up to 11 weeks.

Outdoors Jamaican Pearl can reach up to three meters in height. Although this popular strain might be known for its outdoor vigour, we brought our seeds inside for this run.  

Our grow room is 220 x 150 cm, and our Jamaican Pearl was placed centrally on an elevated table to allow easy access. We used soil as our medium, and our plant was hand-watered daily with essential nutrients when necessary.

Our plant was cultivated under one 600-watt Phillips Green Power high-pressure sodium lamp (HPS) for vegetation and flowering. Fans kept constant airflow through all stages of growth.

Please know that results will vary depending on the grow conditions, and these are simply results as we saw them in our facilities. So, continue reading as we detail our grow of this legendary Caribbean queen, all the way from seed to harvest!

Germination & seedling

Our Jamaican Pearl Feminized seed was germinated in a jiffy propagation cube. Once roots protruded from the cube, the seedling was transplanted to a 3-litre pot filled with BAC Lavasoil Growmix.

The seedling was placed 80 cm below our 600w HPS, where it received a photoperiod of 18 hours of light and 6 hours of darkness. The pot was also rotated daily to ensure all parts received adequate light.

On day three, we began feeding our seedling with 100 ml of water, pH-adjusted to 6.2 with an added rooting hormone. Our nutrient solution held an electrical conductivity (EC) of 0.8. Withholding water for the first few days allowed the rooting system to develop in its new medium.

We dispersed predatory mites (Hypoaspis Miles) to eliminate any fungus gnat or thrip pupae in the soil. These little garden sentries watched over our growing medium and kept any potential outbreaks from occurring. This application was repeated every three weeks. 

By the end of week one, our seedling doubled in size and developed multiple sets of true leaves – she was very content in her new home.

Vegetation

Throughout vegetation, the relative humidity was kept at 65%. During the day, temperatures fluctuated between 24-26°C, and during the evening, the temperature dropped to22°C.These conditions were consistent until flowering began, at which time we decreased the humidity.

Our plant continued to thrive throughout weeks two and three. We added BioGrow nutrients to our feeding schedule during the third week, bringing its EC to 1.4. Our plant responded well, and by day 20, our Jamaican Pearl Feminized had reached a height of 17 centimetres. She seemed to double in size every week!

By the end of the third week, our Jamaican Pearl had grown lovely thick branches with plenty of large fan leaves to promote photosynthesis. Stigmas protruded from small green calyxes along the internodal joints, and her many preflowers let us know that it was time to get this pretty girl blooming!

Flowering

We began the fourth week by changing the lighting schedule to 12 hours on, 12 hours off to induce flowering. We stopped supplementing grow nutrients and rooting hormones and replaced them with flowering nutrients. The additional BioFlower increased our nutrient solution’s EC to 1.6, which our plant seemed to enjoy.

During week four, the humidity in the grow room was reduced to 45%. Lower humidity helped prevent mould development, and a sulfur burner was used at night to avoid mildew. We also introduced Amblyseius Cucumeris to combat thrip larvae and Amblyseius Californicus to potentially combat two-spotted spider mites.

By the end of week four, our Jamaican Pearl Feminized has exceeded our expectations for rapid growth. She’d already reached 48 centimetres and displayed a prominent apical meristem and terminal bud development. Most of her bud sites put forth pistils and calyxes were swelling, letting us know that this plant is flowering rapidly. 

We adjusted our grow light during week five to hang 45 cm above the plant, where it stayed for the remainder of the grow. Our plant was stretching for light and had reached 62 cm by the week’s end. The water uptake had also doubled since flowering began, and our Jamaican Pearl now required a healthy 400 ml per day.

During week six, we conducted a one-day flush of the plant’s roots with plain tap water to dissolve any nutrient residue and salt buildup around the roots. This process was repeated every two weeks until we began our final flush. Jamaican Pearl’s regular feeding schedule was resumed the next day.

Weeks six and seven saw continued bud development. Our Jamaican Pearl proudly stood 75 cm tall by the end of week seven and began developing a massive, beautiful cola. Side shoots and buds were developing nicely. Flowering nutrients increased our nutrient solution’s EC to 1.8, and our plant was thriving. By the end of week eight, she’d reached her terminal height of 79 cm. 

Our Jamaican Pearl was beginning to resemble a Christmas tree by week nine. The terminal bud had swollen into a large, dense cola, while side shoots developed smaller colas of their own. The majority of pistils were white, but a select few pistils had begun to change to a hue of orange and red.

Our Jamaican Pearl was already vigorous and abundant in size, and It was hard to believe that she could get any bigger. However, throughout weeks ten and eleven, she continued to put on weight. Despite not growing any taller, our Jamaican Pearl continued to consume 1000ml of water per day – dedicating all of her resources to filling out those big and beautiful buds!

The plant’s main cola began to lean under the weight by week twelve, and lower buds on the apical meristem grew large enough to reach the terminal bud. A dense layer of trichomes covered the buds and glistened under the 600w HPS.

At the end of week thirteen, we began our final flush with regular tap water to remove any impurities from the root system. Our Jamaican Pearl buds had grown remarkably and were covered in a sticky layer of resin. Calyxes were swelling substantially, and a sweet and fruity aroma with earthy undertones now engulfed our grow room. 

During week fourteen, trichomes had swollen significantly and turned a milky white. Most of the remaining white pistils had changed into a golden orange or deep red. Flowers were becoming denser, and it was almost time for harvest.

We continued our final flush throughout the end of the week and leaves eventually changed into a lush golden yellow, initiating it was time to harvest. Reaching a tremendous 79 centimetres, the plant was massive for its container. The flowers were enormous and covered in sticky, milky amber-coloured trichomes. The main cola was exceptional, and the lower axillary buds developed into dense colas.  

Harvest

In preparation for harvest, larger fan leaves were removed, and branches were separated from the main stem. All branches were then hung upside in the dark in our drying room. The temperature was maintained between 18-20°C, with fans ensuring constant air circulation. After two weeks of drying, our harvest was ready to trim.

After putting on gloves, trimming scissors were used to lightly trim the buds, removing any unwanted foliage. Our scissors and gloves were covered in resin throughout the trimming process, and we collected some excellent finger hash!

Once buds had been trimmed, we were left with 113 grams of dried flower from this potent sativa. The trimmed flowers were quite pungent, giving off sweet and spicy notes with an earthy undertone. The aromatic bouquet was genuinely reminiscent of the tropics.

Manicured buds were then stored in air-tight mason jars and kept in our drying room with a constant temperature of 20-22°C.

Jars were opened daily to replenish fresh air and maintain adequate airflow, which helped to preserve Jamaican Pearl’s exotic terpene profile. After three months of curing, we were greeted with an intensely fruity aroma. We tested the cannabinoid content of our Jamaican Pearl Feminized in our laboratory, and testing results showed our dried flowers to have a THC content of 13.1%.

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Terpene profile

With a unique terpene profile made up of myrcene, caryophyllene, limonene – our Jamaican Pearl tastes much like it smells: earthy and sweet with a fruity tinge that will take you straight to the islands.

Our Jamaican Pearl was very smooth, with slight hints of spice upon consumption. An exotic pineapple and citrus bouquet rapidly filled our palette on the exhale, and our taste buds were left with a zesty Caribbean punch.

Our buds possess all of the best characteristics of a classic sativa; the high is euphoric, energetic, and creative. Jamaican Pearl Feminized is a great uplifting strain to enjoy throughout the day. It can be outstanding before embarking on creative endeavours or before a night out. The touch of indica found in this strain can be experienced in the lack of anxiety associated with pure sativas. 

But make no mistake about it: with the potential for up to 22% THC content, this island delight will still leave you feeling just about ready for a Pina Colada!

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The outcome

It’s easy to recognize why Jamaican Pearl Feminized has become one of Sensi Seeds’ most popular sativa-dominant strains. Jamaican Pearl is a sweet uplighting sativa with Caribbean heritage and is the perfect strain for daytime use.

As we have shown throughout our grow, Jamaican Pearl has the potential for high yields and can deliver a bountiful harvest, even with just one plant. It is a very potent, highly resinous sativa that is tough and formidable.

Growing Jamaican Pearl Feminized outside may not be for everyone as it can easily reach three meters in height. However, for those of you who are inclined to try your hand at indoor cultivation, she will flourish in a screen of green (SCROG) setup.

Jamaican Pearl is an ideal strain for intermediate and experienced growers looking for a high-yielding cultivar with sweet Caribbean vibes.

Are you a fan of Jamaican Pearl? Have you cultivated it yourself? If you have, please let us tell about your grows in the comments below! Or you could stop by GrowDiaries.com and write a review yourself, complete with pictures!

Be sure to check out the Sensi Seeds catalogue and check out our wide range of sativa cultivars. Head on over to purchase your own Jamaican Pearl Feminized cannabis seeds or Jamaican Pearl Regular seeds.