Personalized Attention +44 151 947 0713
SHIPPING TO ALL
9/10 Rating
SALE TO MINORS PROHIBITED
Open your shop
Stores
Iniciar sesión
0
Favorites
Black Harlequin
€19.19
€23.99
20%
4.88/5
(17 Ratings)
Black Harlequin ( previously Sensi #1318) is a high yielding strain that’s easy to grow and produces a 1:1 THC and CBD ratio, making for a soft, medicinal effect.
Subscribe and we'll let you know when we have stock.
Similar Products
1
loyalty point.
Your cart will total 1
loyalty point
that can be converted into a voucher of
0.20€
Data sheet
Bank
Sensi Seeds
Seed type
Feminized
Available individually
No
Recommended use
Medicinal
Recommended growing environment
Any
Cannabinoid profile
Balanced THC : CBD
Genotype
Indica-dominant
Physical effect
Soft
Psychoactive effect
Relaxing / medicinal
Indoor Flowering Time
9-10 weeks
Outdoor Harvest Time
October
Flavor
Earthy
Flavor 2
Incense
Climate
Mild
Description
Black Harlequin by Sensi Seed is a strain that comes from a combination between a Black Domina and a world-renowned Harlequin strain, which is one of the most successful CBD-rich strains in the United States. This medicinal combination was originally sold as Sensi #1318, and the growers around the world that were lucky enough to try this strain say that it’s an incredibly high quality, high yielding and easy to grow plant that can be used for medical and recreational purposes. Sensi was originally only going to release three different new strains, but Sensi #1318 turned out to be so successful that they wanted everyone to be able to try it.
How to Grow Black Harlequin Marijuana Seeds
Learn to grow Black Harlequin Indoors
In indoor grows, this strain grows quite strong and sturdy, producing a bushy structure that’s quite airy too, which allows for more light reach towards the bottom of the plants. We recommend removing some leaves at the start of the flowering period and then halfway through again – do this with care and only remove the largest leaves that seem to be shading the rest of the plant. We recommend placing between 9 and 12 plants per m2, and if grown properly it can generate over 450 g per square meter after 55 flowering days. On the other hand, it’s not that hard to grow but you’ll need to give it a decent feeding schedule in order to harvest the absolute most per square meter. You’ll need to keep careful control over the humidity throughout the last couple of flowering weeks, as its flowers grow large and dense.
Learn to grow Black Harlequin Outdoors
In outdoor grows, growing straight in the ground at the start of the season, you can harvest plants that grow over 2 m tall with plenty of side branches, which allows you grow plants that are incredibly wide – you can harvest over 700 g per plant when done right. We recommend training its structure to keep its branches nice and strong and you’ll definitely need to take care when it comes to caterpillars – its flowers are incredibly large, and it can be hard to find these insects at times, and you may end up with rotting plants without even realizing it. Apart from that, it doesn’t need much care at all and you can easily top it if you want to, or use SCRoG Nets Per Meter – 2m Wide, or even grow it from June onwards if you’re growing on a balcony or on a roof and need discretion. It should be ready to harvest towards October.
Black Harlequin Medicinal Effect and Aroma
Flavor and aroma
The organoleptic properties of this strain can be perceived from the start of the cultivation process. It's easy to notice clear floral and forest scents during its development, fresh and sweet. Such aromas are boosted during the flowering period and the curing process, where it adds a pungent earthy touch. Regarding its flavors, it features a floral taste with a sweet background with some intense woody tinges.
Effects
Thanks to its 1:1 ratio and its 40/60 indica/sativa combination, its effect is both physically and mentally relaxing without ending up too strong or intense. This strain is perfect for those looking to start consuming medicinal cannabis. In as far as aroma, this strain produces earthy and floral tones accompanied by an intense, wet earth aftertaste.
Black Harlequin important data:
- Sativa/Indica: 40/60%
- Flowering: 55-65 days indoors, beginning of October onwards outdoors.
- Height: 0.6-1.3 m indoors, 1.5-2.5 m outdoors.
- Yield: 450- 550 g/m2 indoors, 700 g per plant outdoors.
You might also like
Same category products Black Harlequin
17/10/2025
Everything was correct and very fast shipping, as always. Thanks, these high quality seeds are much appreciated.
Translated from Spanish
Todo correcto y muy rápido el envío, como siempre. Gracias, se agradecen mucho estas semillas de gran calidad.
03/10/2025
What a wonder! Very happy with how the plants are developing. Looks like things are clearly improving.
Translated from Spanish
¡Qué maravilla! Muy contenta con el desarrollo de las plantas. Parece que la cosa mejora claramente.
25/09/2025
Vigorous growth, had no issues with pests. The smell in veg is pretty discreet, really like that.
Translated from Spanish
Crecimiento vigoroso, no tuve problemas con plagas. El olor en vegetativo es bastante discreto, eso me gusta mucho.
12/09/2025
The seeds all germinated, perfect. Now to wait for them to grow and see how they do outdoors. Fingers crossed!
Translated from Spanish
Las semillas germinaron todas, perfecto. Ahora a esperar que crezcan y ver qué tal se comportan en exterior. ¡Crucemos los dedos!
10/09/2025
Amazing strain! To be honest, it's super promising. I can't wait to see it in flowering, looks spectacular. Really happy with the start.
Translated from Spanish
¡Tremenda genética! La verdad es que promete un montón. Ya quiero verla en floración, pinta espectacular. Muy contenta con el inicio.
07/09/2025
The smell is strong, yeah, but with a good carbon filter it's totally manageable. Truth is, the terpene profile is amazing, very complex and sweet.
Translated from Spanish
El olor es potente, sí, pero con un buen filtro anti-olor se lleva sin problema. La verdad es que el perfil aromático es una pasada, muy complejo y dulce.
03/09/2025
Germination 10/10. Very satisfied with the start, everything was super fast and the order packaging was also very nice.
Translated from Spanish
Germinación 10/10. Muy satisfecho con el inicio, todo muy rápido y la presentación del pedido también muy buena.
27/08/2025
I got a phenotype that's a bit more stretched than I expected, but the yield looks like it's going to be good. We'll see if it's stable.
Translated from Spanish
Me ha salido un fenotipo un poco más espigado de lo que esperaba, pero la producción pinta que va a ser buena. Veremos si es estable.
24/08/2025
For my first time with this strain, it went great. I used 15L pots and a good substrate, and honestly it responded great. Let's see how it ends up, but it looks really good, doesn't it? I'll review the harvest.
Translated from Spanish
Para ser mi primera vez con esta variedad, ha ido de lujo. Usé macetas de 15L y un buen sustrato, y la verdad es que ha respondido genial. A ver qué tal al final, pero pinta muy bien, ¿eh? Comentaré la cosecha.
22/08/2025
Did anyone else notice such fast growth in veg? Impressive. Let's see if the buds get that big too, I hope so.
Translated from Spanish
¿Alguien más notó el crecimiento tan rápido en vegetativo? Impresionante. A ver si los cogollos también cogen ese tamaño, que espero que sí.
16/08/2025
Reminds me of some old-school indicas, but with a modern twist. Hope that Haze effect really comes through in the end, that's what I'm after.
Translated from Spanish
Me recuerda a algunas indicas de antes, pero con un toque moderno. Espero que ese efecto Haze se note bien al final, que es lo que busco.
03/08/2025
In about 65-70 days I had it ready indoors. Dense and resinous buds, dry weight was about 60g per plant under 300W LED. The flavour is sweet with earthy hints, a delight. The best auto from Sweet Seeds I've tried lately.
Translated from Spanish
En unos 65-70 días la tuve lista en interior. Cogollos densos y resinosos, el peso en seco fue de unos 60g por planta con 300W LED. El sabor es dulce con toques terrosos, una delicia. La mejor auto de sweet seeds que he probado últimamente.