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Blackwater, aka Blackwater OG, is an indica-dominant hybrid marijuana strain (cultivar) from Cali Connection made by crossing Mendo Purps (also called Mendocino Purp and Mendocino Purple) with San Fernando Valley OG Kush (also SFV OG Kush or OG Kush). Blackwater’s THC content is a potent 20%, while CBD levels rarely exceed 1%.

Blackwater has chunky buds and densely packed leaves when properly cured. Its high resin production creates these large solid nugs, contributing to the strain’s top-shelf “bag appeal.” The flowers appear dark green with purple accents, emitting a sweet grape aroma to complement the hue inherited from Mendocino Purple. Blackwater users enjoy a sweet yet woody flavor with undertones of pine and lemon.

This strain’s heavy indica high is award-winning, receiving Third Best Indica in the 2014 Cannabis Cup in Los Angeles. Fans say Blackwater OG starts mellow but eventually melts down through the body for a euphoric high and sense of calm from head to toe. Its intense sedative effects make the Blackwater strain effective in numerous medical applications, such as stress, anxiety, pain, appetite loss, and multiple sclerosis.

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Strain types

  • 70%Indica
  • 30%Sativa


  • Citrus
  • Earthy
  • Grape
  • Lemon
  • Pine
  • Sweet


  • Berry
  • Citrus
  • Grape
  • Lemon
  • Pine
  • Pungent
  • Sweet
  • Woody


Blackwater’s dominant terpenes are myrcene and delta-3 carene. Myrcene can increase sleeping time and contributes to this indica’s sedative effects. Delta-3 carene is also found in rosemary, lemons, pine, and cedar and supports bone health, chronic pain relief, and anti-inflammation. Blackwater also contains limonene and pinene, which contribute to its pine and lemony scent and anti-inflammatory, pain-relieving, and anti-anxiety effects.

  • Beta-Caryophyllene

  • Delta-3 Carene

  • Humulene

  • Limonene

  • Linalool

  • Myrcene

  • Pinene

  • Terpinolene



Blackwaters has been reported to have the following effects:

  • Appetite-Inducing
  • Creativity
  • Euphoria
  • Laughter
  • Relaxing
  • Sleepiness

The following adverse effects have also been reported:

  • Cottonmouth
  • Dizziness
  • Dry Eyes
  • Dry Mouth
  • Headache
  • Paranoia

Blackwater can boost energy and creativity at low doses before unleashing its relaxing qualities.

Blackwater strain is potent, leaving some people dehydrated and with itchy eyes. It can cause dizziness, mild headaches, or paranoia in rare cases. The strain’s heavy couch-lock effects can also interfere with daily tasks, making it best for evening use.

Medical Applications

The Blackwater strain is a powerful sedative with high THC content. These properties reportedly help with pain from arthritis and other inflammation-related ailments. Others report this award-winning indica helps alleviate muscle spasms, joint pain, and headaches and helps restore lost appetite. Blackwater also helps relieve stress, anxiety, and depression through its mood-elevating properties.
closeup of marijuana nug

Blackwater OG is one of the few “night-time-only” strains due to its narcotic, sleep-inducing effects, with a couch-lock quality. This intense sedation can assist those struggling with insomnia and other sleep issues.

Organ Systems

  • Brain & Nervous System
  • Mental / Emotional
Multiple Sclerosis (MS)

Blackwater fans say the strain significantly eases muscle spasms, muscle tension, and spasticity. The research aligns with these reports, showing that THC and marijuana generally relieve spasms in people with MS by targeting the inflammatory cause of the condition.

Organ Systems

  • Brain & Nervous System
Loss of Appetite

Blackwater increases appetite, similar to all THC-dominant cultivars. Research indicates THC’s appetite-boosting qualities may come from its ability to stimulate the hunger hormone, “ghrelin,” in the body. This effect can benefit those struggling with nausea and appetite loss, like people undergoing chemotherapy.

Organ Systems

  • Endocrine
  • Other

Blackwater OG’s full spectrum of compounds, notably THC, acts as a temporary antidepressant by stimulating the brain’s reward system to produce more dopamine. Users report feeling happy and euphoric, helping them cope with mental and psychological conditions, including depression, stress disorders, and anxiety.

Organ Systems

  • Brain & Nervous System



growing strains

The Blackwater strain performs well in indoor, outdoor, or greenhouse growing scenarios. However, this strain requires specific needs to flourish, making it moderately difficult to grow. Outdoor cultivation requires a warm and semi-humid climate, with daytime temperatures around 75 degrees Fahrenheit.

This strain produces generous yields, especially in a sheltered yet well-lit outdoor environment. Growers should expect Blackwater’s chunky buds and bushy leaves.


Blackwater OG commonly reaches heights of 30-60 inches depending on its genetics and sativa-indica ratio.

Humidity and Temperature

The Blackwater strain prefers daytime temperatures of up to 75 degrees and direct sunlight throughout the day.

Growers who live in cold climates should cultivate this strain indoors.


Blackwater takes about 8-10 weeks to flower. Outdoors, this strain is ready to harvest around late September to early October when grown in a warm, dry space.

Frequently Asked Questions

What is Blackwater good for?

How does Blackwater make you feel?

The Blackwater strain starts with mellow and relaxing effects that eventually sedate the entire body for a classic head-to-toe euphoric high. Users feel calm, relaxed, giggly, happy, and hungry.

Is Blackwater an indica or sativa?

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