Growing Purple Urkle: flowering time, yield and breeder specs

What the plant is like

Accounts of its shape differ. AllBud describes a typical indica, shorter, thicker and bushier, that does better indoors than out, while United Cannabis Seeds describes it as tall for an indica.^4,10

The flowers are dense and dark. Weedmaps describes buds shading from deep green to violet and dark purple under a thick coat of trichomes, and Westword described dark purple calyxes with a velvety look, patches of green and rust-orange pistils.^6,9

What to watch for

Feeding and temperature. A commercial grower told Westword it needs cooler temperatures and a heavier feeding schedule and will smell bad without them, and a home grower said they usually harvest in under 60 days. Weedmaps recommends it for intermediate growers who can manage nutrition and environment.^6,9

Getting the purple

The color comes from anthocyanins, pigments a plant can only make if it has the genes for them. Leafly names Purple Urkle among strains known for purple color, and notes that a purple plant exposed to cold may produce less THC.¹¹

Cool temperatures can help, within limits. In a 2025 study of another purple cannabis line, anthocyanin peaked in plants held at a constant 8 °C or 15 °C and was lower at 0.5 °C and 22 °C, and plants alternating between 22 °C and 4 °C did not reach the levels of plants kept steadily cool.¹² CannaConnection’s profile, which lists Pyramid Seeds as the breeder, says cold temperatures help bring out its purple hues.⁷

Seeds and the law in the US

Under the amended federal definition of hemp, viable seeds from cannabis plants above 0.3% total THC, including THCA, are not hemp.¹³ Congress delayed that exclusion, with most of the new definition, from Nov 12 to Dec 11, 2026; only the exclusion of products with cannabinoids the plant cannot produce naturally starts on Nov 12.¹⁴ Home cultivation rules are set by each state. This site does not sell seeds.