Harlequin is a modern hybrid-sativa strain developed through the deliberate crossing of Thailand - Sativa and Swizerland - Sativa landrace genetics with a Nepal - Indica. This multi-continental lineage establishes the strain as a diverse hybrid, suited for cultivation in both indoor and outdoor environments. Growers can expect a moderate level of difficulty when managing the plant, which reaches maturity after a 65-day flowering period and is known for producing high yields.

The chemical profile of Harlequin is defined by a complex terpene hierarchy that anchors the sensory experience in myrcene, followed by ocimene and nerolidol. This dominant base is rounded out by a secondary tier of pinene, beta-pinene, and limonene, with further nuance provided by caryophyllene and alpha-terpinene. These compounds combine to create a distinct aromatic and flavor profile that reflects the strain's intricate genetic foundation.

The effects of Harlequin are characterized by an uplifted, happy state that promotes creativity. These qualities make the strain effective for users seeking a boost in creativity, social engagement, or sustained focus. The genetic influence of the cultivar is evident in its extensive progeny, which includes notable descendants such as Black Kandy Kush, Canna-So-Hard, CBD Harlequin, Cough Drops, Harlequin CBD, Harlequin CBD 40:1, Harlequin x Super Sour Diesel, Harly Kush CBD, Hynaquin, Lemon Cookie, Mudhoney, and Sunny D.