Harle Tsu
Sour Tsunami × Harlequin
Harle-Tsu is a significant hybrid cultivar developed in Southern Humboldt County, California, by Lawrence Ringo. It was bred to provide robust symptom relief with minimal THC, establishing itself as a cornerstone of the modern CBD-rich cannabis movement. This strain is recognized for its clarity, calm, and daylong usability.
Appearance
Harle-Tsu presents medium-density flowers that range from olive to lime green, adorned with vibrant orange or peach pistils. The buds are typically spade-shaped and feature generous trichome coverage, giving them a frosted appearance despite their low THC content. Gland heads appear abundant and mostly clear to cloudy when the plant is at peak CBD ripeness.
Aroma & Flavor
The aroma of Harle-Tsu is characterized by a pine top note and a fresh, cut-wood scent, with underlying hints of clove-like spice. Many phenotypes also exhibit a brightness reminiscent of lemon zest and a subtle sweet herbaceousness. On the palate, consumers can expect notes of crisp pine, mild earthiness, and a gentle floral quality, with some phenotypes offering a soft, tea-like sweetness on the finish.
Effects
Harle-Tsu is primarily sought after for its ability to promote clarity and calm without significant psychoactive effects. It is often reported to support focus and attentional capabilities, making it suitable for daytime use. Consumers appreciate its functional profile, which allows for symptom management without intoxication.
Terpenes & Cannabinoids
This strain is distinguished by its high CBD content, typically ranging from 12–22%, with THC levels usually below 1%. This results in prominent CBD:THC ratios, often around 18:1, but capable of spanning from 10:1 to 30:1. The terpene profile commonly includes myrcene, beta-caryophyllene, alpha- and beta-pinene, bisabolol, and humulene. Minor cannabinoids like CBC and CBG are also present in varying amounts.
Origins & Lineage
Harle-Tsu was developed by Lawrence Ringo of Southern Humboldt Seed Collective. It is a deliberate cross between Sour Tsunami and Harlequin, two influential CBD-dominant strains. Sour Tsunami was derived from Diesel-family genetics selected for high CBD, while Harlequin is a hybrid with Colombian Gold, Thai, Swiss sativa, and Nepalese indica heritage. The breeding aimed to combine Sour Tsunami's CBD production with Harlequin's clear-headed effects.