Regular Seeds: Cannabis’s Genetic Library

Walk through most seed shops today and the regular section is a shelf at the back: smaller every year, marked cheaper than the feminized packs next to it, and bought by a dwindling number of people who understand exactly what they are looking for. It is tempting to see that as obsolescence. It is closer to the truth to see it as a library losing shelves while the bookshop next door grows. Every female-only line began as a regular one, every new cross requires a male somewhere in its pedigree, and the breadth of cannabis genetics that exists at all exists because somebody held onto regular seed. Dedicated sellers such as https://breederregularseeds.com carry lines that trace to the 1980s, offered in packs of 10 seeds because a pack is intended to be a population, not a single plant. This article makes the case for that half-male pack: what the male contributes, what a buyer loses by not seeing one, and how to get value with a population instead of a clone.

The Other Half of the Genome

The easy account of a male cannabis plant is “a pollen source”, and to a flower grower that is the whole of it. For a breeder it is half the genome of every seed that follows, and half is chosen with the same attention as the female.

A male passes on structure, vigour, maturation time, tolerance to mould and pests, resin production and the aromatic chemistry exactly as the female does; it just shows some of those traits less visibly because it does not produce a smokable flower. Breeders who breed with regular seed invest at least as much time selecting males as females, and this is the work that a feminized cross borrows and can never replicate. Feminizing a female yields pollen; it cannot provide a second line of selected traits.

What Happens When Lines Are Only Selfed

A great deal of the feminized catalogue is made from S1 seeds: a single famous clone, reversed and crossed with itself. Each round of that selfing cuts in half the remaining genetic variation, and after two generations what remains is close to one plant repeated in marginally different forms.

That is fine for a grower who wants that single plant. It is a problem for everyone downstream. Recessive weaknesses surface: intersex tendencies, weak stems, susceptibility to one particular mould. Traits that were present in the original line but not in the selected clone disappear out of the gene pool altogether. A decade of this produces a market crowded with variations of a dozen plants, and a breeder trying to create something new discovers there is little left to work with. Regular seed from an outcrossed line is the store that refills the pool, and that reservoir only exists if somebody keep growing it.

Reading a Male Plant

Articles on choosing females are everywhere; advice on choosing males is scarce, since most growers never keep one past the first week of flower to judge. For a grower producing seed, the following are the signs breeders look for.

  • Resin on the stem. Rub a stem or a pollen sac and smell it. A male with resin on its sepals and a strong scent suggests it carries the terpene traits that are worth keeping.
  • Stability. A male that at the same time shows female pistils under ordinary conditions is discarded outright; that tendency is the one thing worth breeding forward.
  • Structure. Short internodes, a thick central stem and a frame that resembles the desired female habit are inherited; a lanky, weak-stemmed male passes that on too.
  • Timing. A male that declares sex first and flowers at the same pace as the females is far more useful than a very early one that sheds pollen before the female is receptive.

Thinking in Numbers

A error new regular-seed growers fall into is seeing a pack as 10 attempts at the one plant. It is nothing of the kind. A pack from a genuine outcrossed line is a slice of a population, and the point of growing it is to see the range and select from it.

Roughly half the plants will be male, which means a pack of 10 seeds yields something like five females to compare and five males to either cull or judge for breeding. Among the females, expect real differences: height, finishing time, smell, density, resistance. That spread is not a flaw in the seed; it is what the seed is selling. The grower who keeps the best female and the best male now owns something a feminized pack cannot supply: a line of selected parents that are their own.

From One Pack to the Next

Holding selected parents means making the next batch, and there the options multiply. Three methods account for most of what small-scale breeders do.

  • Open pollination. Allow every male reach each female. It preserves the full range of the line, makes a generous volume of seed, and involves no selection at all. This is how traditional lines are kept alive, and it is the correct approach when the aim is preservation not refinement.
  • Backcross. Cross a selected seedling again to one of its original parents to fix a specific trait. It narrows the genetics fast and is used when one plant shows something worth concentrating and the second brought mostly vigour.
  • Selected cross. One picked male to one or a few chosen females, everything else removed. The seeds inherit the traits of two selected plants and express narrower spread than the original pack. Repeated over several rounds with stable choices, this is how a new line is made.

All three require nothing more than a separate space for the male, a paintbrush or a small bag, and patience. Not one of them needs the chemical treatment that feminized production requires.

Landraces and Heirloom Lines

A number of lines have never feminized and likely never will be: landraces collected from regions where cannabis grew over centuries, and old hybrids from the first decades of indoor breeding. They are available as regular seed since the breeders keeping them regard the population as the whole value, and reversing a single clone would destroy exactly what makes the line worth keeping.

Growing a landrace from regular seed is a different experience from growing a commercial hybrid. There will be wide variation, extended flowering times in equatorial lines, lanky plants, and traits that made sense in a field but not under a tent. Expect also aromas and effects that no longer exist in the commercial market anywhere. Breeder Regular Seeds holds a dedicated landrace and heirloom section, and each line labelled with its origin of origin and the generation it has been grown out since the original collection.

The Honest Exclusions

None of the above turns regular seed into the right option for everyone, and pretending otherwise would the product no service.

A grower with room for a handful of plants who needs every one of them to finish is better off with feminized seed. The same is anyone who cannot afford to inspect the plants each day during the start of flower, because a late male in a confined space seeds the whole crop inside days. Someone running a single autoflower on a balcony gets no value from a pack they cannot select from. And anyone who wants a specific clone-only cut repeated as closely as possible is better off looking for a feminized S1, not a two-parent cross. Regular seed is for the grower who wants to select, to hold onto and at some point to produce something new; for everyone else the back shelf is best left alone.

Before You Buy

Breeder Regular Seeds sends every order in unmarked parcels with the breeder’s packs intact inside and nothing on the outside to reveal the contents. Orders to the United States are not accepted, as seed importation is restricted there. Seed law differs widely by country: in many places buying seeds is lawful as collectables while germinating them is not, and in others the two are permitted under local rules or both is. Knowing the position in your own jurisdiction is the buyer’s responsibility, and no part of this article is legal advice.