Subcool

Who he was

Subcool, the pen name of Marc Scialdone, was an American cannabis breeder who co-founded TGA Subcool Seeds (originally 'The Green Avengers') with his wife MzJill. He rose to prominence in the 2000s through grow columns in High Times and Skunk Magazine, and through active participation on forums including Cannabis.com, Overgrow, The Farm, and ICMag Strong evidence.

What set Subcool apart from most breeders of his era was his public persona. He wrote in a chatty, opinionated voice, posted detailed grow logs with photos, and made YouTube videos at a time when most cannabis breeders remained anonymous or pseudonymous. That visibility made him one of the first U.S. breeders many home growers could actually name by a consistent identity.

Timeline

Late 1990s–early 2000s: Scialdone begins breeding seriously in California, working with cuts circulating in the Bay Area medical cannabis scene. The Space Queen clone — sourced from BC breeder Vic High of BCGA — becomes a foundational male in much of his breeding work Strong evidence^[1].

Mid-2000s: TGA Subcool Seeds launches commercially. Early releases include Jack the Ripper (Jack's Cleaner x Space Queen), Vortex (Apollo 13 x Space Queen), Querkle (Purple Urkle x Space Queen), and Jilly Bean (Orange Velvet x Space Queen).

2008–2012: Peak influence period. His 'Sub's Super Soil' recipe — a heavily amended organic mix designed for no-till growing — spreads widely through High Times publication and online home-growing communities. He publishes Dank: The Quest for the Very Best Marijuana with Ed Rosenthal's Quick American imprint in 2011 ^[2].

2015: MzJill and Subcool divorce; she leaves TGA Subcool Seeds. The company continues under Subcool with new business partners.

2018: Wildfires in Oregon, where Subcool had relocated, destroy much of his personal seed vault and mother-plant collection — an event he documented publicly in online communities.

February 1, 2020: Subcool dies at age 54 from complications of long-standing health problems Strong evidence.

Breeding work and signature crosses

Most TGA releases share a common genetic backbone: the Space Queen / Space Dude male line, itself derived from Romulan x Cinderella 99 genetics originating in British Columbia Strong evidence^[1]. Subcool's core breeding method was pollinating established clone-only female cuts with this male, a straightforward cross-breeding approach that produced a recognizable TGA house style — fruity, often purple-tinged, with reported fast-onset cerebral effects.

Key releases in the TGA catalog include:

• Jack the Ripper — Jack's Cleaner female x Space Queen male; known for citrus/lemon terpene profile.
• Vortex — Apollo 13 F3 x Space Queen; placed 3rd Sativa at the 2007 High Times Cannabis Cup Weak / limited.
• Querkle — Purple Urkle x Space Queen; grape-leaning, indica-dominant morphology.
• Jilly Bean — Orange Velvet x Space Queen; orange/mango terpene profile.
• Chernobyl — Trainwreck x Jack the Ripper.
• Agent Orange, Pennywise, Dairy Queen — later commercial releases.

These strains are documented in the TGA catalog and contemporary seedbank listings. However, as with most cannabis pedigrees, the parent clones themselves trace to informally documented sources rather than formally registered genetic lines Disputed. Cannabis lineage relies heavily on grower notes, forum archives, and seed-seller documentation rather than laboratory verification.

Super Soil and marketing mythology

Subcool's 'Super Soil' recipe — a base potting mix amended with bat guano, blood meal, bone meal, rock dust, Epsom salts, dolomite lime, mycorrhizal fungi, and other organic inputs — was published in High Times around 2009 and widely reprinted. The underlying principle (amended soil that feeds plants through their lifecycle using only water) is established organic horticulture practice and predates Subcool by decades; his contribution was packaging and popularizing it for a cannabis-growing audience Strong evidence.

Where popular claims outpaced evidence:

• 'Cleaner' or 'more medicinal' cannabis: Claims that Super Soil produces categorically superior cannabis compared to other well-managed organic or hydroponic systems lack controlled comparative studies No data. Soil-grown, hydroponic, and other systems can all produce high-quality cannabis when properly managed.

• Terpene or cannabinoid enhancement: Popular claims that specific amendments in Super Soil boost particular cannabinoid or terpene profiles are anecdotal observations rather than controlled trials Anecdote.

• Proprietary status: The recipe is often presented as Subcool's invention; the individual amendments are standard organic inputs available from any garden center and commonly used in vegetable and ornamental horticulture.

Subcool was also a vocal advocate for the indica/sativa effect framework — the belief that plant morphology predicts psychoactive effects. This framework is now regarded by cannabinoid researchers as a poor predictor of effect compared to cannabinoid and terpene composition Strong evidence^[3].

Legacy and fragmentation

After Subcool's death in February 2020, the TGA Subcool Seeds brand fragmented. MzJill Genetics continued as a separate operation; various growers preserved TGA strains through clone exchanges and S1 (self-pollinated) reproductions of variable genetic stability Weak / limited.

Subcool's most lasting influence is not tied to any single strain but to the model he demonstrated: a named, public-facing hobbyist breeder who taught cultivation technique openly, sold seeds directly to consumers, and treated home growers as the primary audience rather than commercial operations. That template — combining transparency, accessibility, and direct-to-consumer marketing — became a blueprint for the wave of American craft cannabis breeders who emerged during the 2010s legalization period.

His willingness to publish detailed grow logs, troubleshoot problems in forums, and engage with growers by name shifted breeder culture toward visibility in a space that had historically demanded anonymity. For better and worse, that shift shaped expectations about cannabis genetics education and the role of the breeder as a public figure.

Sources

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