Pineapple Runtz Rbx2 Auto by Ethos Genetics

Pineapple Runtz Rbx2 Auto is one Ethos Genetics holds in especially high regard. The breeder calls it special and the first auto from the program that could compete for a cannabis cup, thanks to loud terpenes, heavy resin, and spectacular functional effects.

The lineage blends Pink Runtz and Piña in several directions, with Piña Auto bringing the autoflowering trait. The plant stays compact, finishes in about 70 to 80 days from seed, carries a medium yield rating, and the breeder lists a Total Active Cannabinoids range of up to TAC 25%.

Expect tropical starburst candy on the nose and vibrant color in the flowers. For anyone hunting the Pineapple Runtz strain as an autoflower, it is one of the standout Ethos seeds for small spaces.

Lineage: Runtz x Piña, Backcrossed to Piña Auto

The breeder lists the pedigree as (Runtz x Piña) x Piña Auto x (Runtz x Piña Auto), with the Runtz parent being Pink Runtz from clone. In short, Ethos crossed a Pink Runtz clone with Piña, worked the offspring together with Piña Auto, and folded in the auto version of the same cross to lock in day-neutral flowering.

Rbx2 means a second reversed backcross. Using reversed females keeps the seeds feminized, and the second round of backcrossing strengthens the candy-and-tropical profile and the plant’s consistency. It is a good look at how Ethos cannabis genetics builds autos with photoperiod-level quality.

Aroma, Flavor, and Effect

The nose is like a handful of tropical starburst candies: sweet, fruity, and loud. Ethos tags the families as berry, candied-sweet, and tropical, so expect sugary fruit with a juicy berry edge.

The flavor matches the smell closely, sweet and chewy on the inhale with tropical fruit hanging on after the exhale. Heavy resin keeps the terps strong through the cure, and the vibrant flower color adds to the bag appeal.

Ethos describes the effect as classic hybrid and calls it spectacular and functional. Expect a clear, upbeat lift with a relaxed body, suitable for daytime or early evening without feeling weighed down.

Growing Pineapple Runtz Rbx2 Auto Indoors and Outdoors

Indoors, run the light on 18/6 or 20/4 from seed to harvest. The plant flowers on its own, so no light switch is needed. With a short-to-medium height and short-to-medium internodes, it fits small tents, grow boxes, and stealth setups.

Sow directly into the final container and keep early feeding light. Increase nutrients as flowers form, and use gentle LST to spread the compact frame. Ethos describes it as beginner friendly, though the taxonomy rates it for intermediate to pro growers, so attention to humidity and airflow helps protect the dense, resinous buds.

The breeder lists indoor, greenhouse, and outdoor as ideal environments and says it thrives in both settings. Outdoors, the 70-to-80-day cycle lets you fit in more than one run per season in many US regions, and the compact size makes it easy to keep low-profile.

Pineapple Runtz Rbx2 Auto Characteristics

Strain type	Feminized autoflower
Generation	Rbx2 (second reversed backcross)
Genetics	(Runtz x Piña) x Piña Auto x (Runtz x Piña Auto); Runtz is a Pink Runtz clone
TAC	Up to 25% (Total Active Cannabinoids)
Effect	Classic hybrid: functional, upbeat, relaxed body
Aroma/Terpenes	Tropical starburst candy, fruity, berry
Yield	Medium
Seed to harvest	70-80 days
Height	Short to medium, compact
Grow level	Beginner friendly; rated up to pro
Ideal environment	Indoor, greenhouse, outdoor
Best cultivation technique	Gentle LST in small tents under 18/6 or 20/4 light

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