English 
Choosing breeding parents is the decision that shapes everything downstream. Most first projects fail here rather than in the pollination itself. The usual mistake is simple: people pick their two favourite plants and hope.
This article covers how to define a goal, how to judge each parent against it, and why the male deserves as much attention as the female.
Start with a written goal
Write one sentence describing what you want. Something like a shorter version of a favourite line, or the same flavour finishing two weeks earlier. Vague goals produce vague results. A written sentence also stops you drifting mid project.
Why best plus best often fails
Two excellent plants do not automatically make excellent offspring. Their strengths may come from different gene combinations that do not stack. Consequently the first generation can look worse than either parent. Selection has to target traits, not overall impressions.
What a trait actually is
A trait is one measurable characteristic. Flowering time is a trait. Internode length is a trait. Overall quality is not, because it bundles a dozen things together. Break your goal into two or three real traits before you go further.
Traits that are easy to select
Flowering time, plant height, internode spacing and leaf shape all move predictably. They are visible, countable and largely genetic. Therefore they respond quickly to selection. Beginners should choose from this group.
Traits that are difficult
Yield, potency and complex aroma involve many genes at once. They also shift with growing conditions. As a result they take many generations to fix. Chasing them in a first project usually leads to frustration.
Dominant and recessive in plain language
Some traits show up in the first generation and some hide. A hidden trait can reappear in the second generation. That is exactly why breeders make an F2 rather than stopping at F1. Expect surprises in the second round, not the first.
Choosing the female parent
The female is easier to judge because you see her flowers. Assess structure, finishing time, resistance and aroma. Grow her under your own conditions rather than trusting a description. A dependable line such as Critical 2.0 Feminized makes a useful, well documented starting point.
Choosing the male parent
The male contributes half the genetics and gets a tenth of the attention. That imbalance is the single biggest error in hobby breeding. You cannot smell his flowers or weigh his harvest. You can, however, read a great deal from how he grows.
How to judge a male at all
Look at vigour first: strong roots and fast early growth. Look next at structure, because branching pattern passes to the offspring. Check internode spacing and stem thickness. Finally, note how early he shows sex, since that tracks with flowering time.
Aroma from a male plant
Rub a stem or a leaf between your fingers. Males carry terpenes even without resinous flowers. A male that smells of nothing usually contributes nothing on that front. This simple test narrows a group of ten to two or three quickly.
Population size for selection
Selection needs numbers. Ten males and ten females is a workable minimum. Twenty of each is much better. With three plants you are not selecting, you are simply using what you have.
Select under your own conditions
A plant that performs in your room is what you actually want. Descriptions written elsewhere reflect somebody else’s setup. Therefore run the candidates yourself before deciding. This step alone improves most projects.
Keep a mother and a pollen donor
Once you have chosen, take cuttings of the female and keep her alive. Collect and store pollen from the male in a sealed container in the freezer. That way you can repeat the cross next year. Losing a good parent is the most common regret in breeding.
A selection sheet you can copy
- Days from sprout to visible sex.
- Internode spacing at node five.
- Stem thickness and branching pattern.
- Aroma when a leaf is rubbed.
- Days from flip to finish, for females.
- Structure and resistance in your own conditions.
Regular seed is required
You cannot breed properly without males, so regular packs are essential. Feminized seed has its place in production, not in a selection programme. A vigorous regular line gives you both sexes to work with. Plan the space for the plants you will remove.
What to expect in the first generation
F1 plants from two different lines often look uniform. That uniformity is temporary and it hides the variation underneath. Hybrid vigour can also make them look better than they really are. Do not draw conclusions from F1 alone.
Why the real work starts at F2
Crossing two F1 siblings produces the second generation. Here the hidden traits reappear and the population spreads out. That spread is where you select. A vigorous line like Bruce Banner Feminized shows how much can hide behind a uniform F1.
Record everything
Number every plant and keep notes from day one. Photograph each candidate at the same age. Without records the project becomes guesswork by the third generation. This is the difference between breeding and simply making seeds.
A realistic first project
Pick one easy trait and one line you already like. Aim to shorten flowering by ten days, for example. A fast finishing line such as Strawberry Gelato Autoflower shows what that target looks like in practice, though autos need a different approach.
Isolating the male before pollen drops
Move the chosen male out of the room before his sacs open. Pollen travels easily and it will seed everything nearby. A separate cupboard with its own light is enough. Collect the pollen on paper and store it dry.
Storing pollen for later use
Mix pollen with a little flour to keep it dry and easy to handle. Seal it in a small container with a desiccant sachet. Kept frozen it stays viable for months. That storage lets you cross the same male into several females over time.
Labelling every cross
Write the female name, the male number and the date on every envelope. Six months later you will not remember which was which. Good labels turn a pile of seed into a usable library. This habit costs nothing and saves entire projects.
A note on local law
Cannabis cultivation rules differ widely between countries and often between regions. Seeds are sold as collector and genetic preservation items. This article is general horticultural information. Please check what applies where you live before growing anything.
Define the goal before you choose
Picking parents without a stated goal produces a project with no direction. You must decide first what you want to improve: flowering time, structure or resilience. Therefore write that goal in the notebook before sowing anything. Consequently selection stops depending on how you feel on a given evening and starts following a fixed criterion, which is exactly what allows generations to be compared later.
The male counts for half
Almost all the attention goes to the female, yet the male contributes half the genetics. Choosing him by size is the most common mistake. Therefore look at structure, growth rhythm and the smell of the stem rubbed between your fingers. Consequently the decision gains a real basis.
Keep cuttings of the finalists
Take a cutting from every candidate before flowering. Consequently you can judge the mother plant properly and still hold a living clone if she convinces you. Therefore this habit saves an entire generation of waiting.
Frequently asked questions
How many plants do I need for choosing breeding parents?
Ten of each sex is a working minimum. Twenty gives far better selection pressure.
Can I breed with feminized seed?
Not properly. You need males, which means regular seed for any real programme.
How do I judge a male without flowers to smell?
Rub a stem or leaf, then assess vigour, structure and how early he shows sex.
Is F1 the finished product?
No. F1 looks uniform, but selection genuinely begins with the F2 generation.
