What separates a copy from a recombination

A cutting is not a new plant. It is the same plant, continued in another pot, carrying the identical genetics it had before the knife went in.

A seed is something else entirely: two parental contributions recombined, producing an individual that has never existed and whose exact properties nobody knows until it grows.

Everything that separates the two routes follows from that single distinction. This page covers what each involves, why clone lines decline over time, what a seed resets, what each costs, and what none of it appears on when the flower is eventually sold.

⚠️ Scope. This page describes a process and what can be verified from documents. It does not describe what a product does to a person, gives no amounts, and does not replace a healthcare professional.

🔴 What a cutting is

Genetically

An exact copy. Every cell carries the same genome as the plant it came from, with no recombination and no new variation.

What that guarantees

Predictability. A cutting from a plant with known behaviour will behave the same way under the same conditions.

What it cannot do

Improve on the parent. A clone line can only maintain what it started with, and in practice it does not quite manage that either.

The commercial appeal

A grower who has found a plant they like can reproduce it indefinitely rather than searching for it again in every sowing.

What a seed is

Genetically

A recombination. Each parent contributes half a genome, and the combination is new even when both parents are well characterised.

What that produces

Variation. Siblings from one packet differ from each other, sometimes considerably, in ways nobody can predict from the parents alone.

What it enables

Selection, and therefore improvement. Without recombination there is nothing new to select from.

The commercial difficulty

Unpredictability, which a production grower generally does not want. It is why cuttings dominate commercial flower growing.

Taking a cutting

The operation

A shoot is cut from a growing plant, the lower leaves are removed, and the cut end is placed in a rooting medium under high humidity.

What has to happen

The cutting must produce roots before it exhausts its reserves. It is a race between root formation and the stored energy running out.

What helps

High humidity to reduce water loss, moderate light, warmth at the root zone, and frequently a rooting hormone applied to the cut end.

The timescale

One to three weeks to visible roots, depending on the variety and the conditions.

The mother plant

What it is

A plant kept in vegetative growth indefinitely, from which cuttings are taken repeatedly.

How it is held

Under a light schedule that never triggers flowering, trimmed regularly, and fed to sustain continuous growth without excess.

What it costs

Space and light for a plant that produces nothing harvestable. It is pure overhead justified by what it supplies.

How long it lasts

Years, in principle. In practice, mothers are replaced periodically for reasons covered below.

🔴 Why clone lines decline

The observation

Growers report that a line kept for many generations of cuttings gradually loses vigour, yield or character. It is widely reported and imperfectly explained.

The pathogen explanation

Viruses and viroids accumulate in a clone line and pass into every cutting. They are systemic, often symptomless at first, and they do not clear.

The epigenetic explanation

Patterns of gene expression can shift over successive vegetative generations without the underlying sequence changing. It is documented in other crops.

The mother-condition explanation

A mother held for years in restricted root space under constant trimming is not the plant it was. Some of the decline may be her condition rather than the line.

What is actually established

The pathogen part

Well documented. Specific viroids are known to spread through vegetative propagation and to reduce yield and resin production measurably.

The testing that exists

Laboratory assays for the known pathogens are commercially available, and serious operations screen their mothers.

What is not established

How much of the reported decline is pathogen load, how much is epigenetic, and how much is simply the mother getting old in a pot.

What growers do about it

Replace mothers periodically from tested stock, or return to seed and select a new plant. Both are routine practice.

What a seed resets

The pathogen load

Most systemic pathogens do not pass through seed. Starting from seed generally starts clean, which is a substantial practical advantage.

The epigenetic state

Sexual reproduction resets much of the expression patterning that accumulated in a vegetative line.

What it does not reset

Anything in the genome itself. A genetic weakness in the parents passes to the offspring.

The trade-off

A clean start, at the cost of not knowing exactly what you have until it grows.

Uniformity in a growing space

Why it matters practically

Plants of identical genetics grow at the same rate, reach the same height, and mature at the same time. A room of clones can be managed as one unit.

What a seeded room looks like

Individuals at different heights, maturing days or weeks apart, needing different amounts of light and water. Every operation becomes plant-by-plant.

The harvest consequence

A clone crop is cut in one pass. A seed crop is cut in several, or cut once and accept that some plants were not ready.

Why this dominates the decision

For a commercial grower it is the largest single factor. Uniformity is worth more than the genetic advantages of seed.

Disease transmission

The clone risk

A cutting carries whatever the mother had: viruses, viroids, and any pest present on the tissue. It travels with the material.

How it spreads

An infected mother supplies infected cuttings to a whole room. A single unscreened acquisition can compromise an entire operation.

What careful operations do

Quarantine incoming material, test before introduction, and maintain screened mother stock rather than accepting cuttings casually.

The seed comparison

Seed carries far less. It is the standard route for establishing clean stock, and it is why seed remains important even where clones dominate production.

The regulatory position of each

What the catalogue governs

A variety cultivated for the compliant market must appear in the common catalogue of varieties of agricultural plant species and stay within the total THC limit.

What that means for seed

Seed of a listed variety, certified as such, is straightforward. The identity is documented and the examination has been done.

What it means for cuttings

A cutting is vegetative reproductive material of the same listed variety. The variety identity is inherited from the plant it came from.

Where the difficulty sits

Documenting that a cutting is what it claims to be. Seed has certification schemes; vegetative material relies more heavily on the supplier’s records.

What the catalogue examines

The three criteria

Distinctness from known varieties, uniformity between individuals, and stability across propagations. All three must be demonstrated.

Why uniformity is easier for clones

Because they are identical by construction. A clone line satisfies uniformity trivially.

Why it is harder for seed varieties

Because a seed population must be brought to uniformity by selection over generations before it can be examined.

What follows

Variety registration is a different task depending on the propagation route, and the catalogue accommodates both.

Cost structure

Cuttings

Cheap per unit once mothers exist. Expensive in the overhead of maintaining mothers, and in the screening required to keep them clean.

Seed

Expensive per unit, particularly feminised seed. No ongoing overhead, and no accumulated pathogen risk.

Where each wins

Cuttings for continuous production of a known plant. Seed for starting, for renewing, and for anything involving selection.

What most operations do

Both. Seed to find and establish, cuttings to reproduce, and a return to seed when the line declines.

Selection and where it happens

From seed

Grow a population, observe the individuals, keep the best. It is ordinary selection and it requires space and time.

What is kept

The selected plant becomes a mother, and everything afterwards is cuttings from it. Selection happens once and is then reproduced.

Why this cycle exists

Because seed provides the variation and clones provide the reproduction. Neither route does both.

How often it is repeated

When the line declines, when the market wants something different, or when a grower wants to improve on what they have.

Tissue culture as a third route

What it is

Propagation from small pieces of tissue in sterile laboratory conditions, producing plants that are genetically identical to the source.

What it offers

Clean material, because the process can eliminate pathogens that a cutting would carry. And storage, because cultures occupy very little space.

What it costs

Laboratory facilities and expertise well beyond what a growing operation ordinarily has.

Where it is used

By specialist suppliers producing clean stock at scale, rather than by growers themselves.

What a flower buyer inherits

From a clone crop

Uniformity between flowers, and whatever the line’s condition is. A declining line shows in the material.

From a seed crop

Variation between plants, which may or may not survive into the packaged product depending on how it was sorted.

What is visible

Batch-to-batch consistency, over repeated purchases from the same seller. It is the one observable trace of this decision.

What is never recorded

Which route produced the crop. No certificate, label or listing carries it.

The genetic narrowing this produces

What happens at scale

When most production runs on cuttings, very few plants are actually being bred from. A market can end up growing a handful of clone lines under many different commercial names.

Why that is a risk

A narrow genetic base is fragile. A pathogen that affects one widely propagated line affects a large share of production at once, which is the standard argument for diversity in any crop.

What counteracts it

Seed production, breeding programmes, and the periodic return to seed that individual growers make when a line declines. All three keep variation in circulation.

Whether it is visible to a buyer

Not directly. It shows up over years as a market where many products taste and behave similarly despite carrying different names.

What a buyer can actually observe

Consistency across purchases

Buy the same reference twice, several weeks apart, and compare. A stable clone line produces batches that resemble each other closely.

Variation within a package

Flowers that differ noticeably in size, density or aroma within one purchase can indicate a seed crop harvested in one pass.

Neither is a defect

A seed crop is not worse than a clone crop. It is a different production model, and the variation is inherent rather than accidental.

What it does establish

Something about how the producer works, which repeated purchases reveal and no document ever states.

The one distinction worth carrying away

Copies do not improve

A clone line can hold what it has and cannot add to it. Every improvement in this crop, without exception, came from a seed somewhere.

Recombination is the only source of anything new

That is why seed remains essential even in a market where almost all production runs on cuttings. The variation has to come from somewhere, and there is only one place it comes from.

A short glossary

Clone

A plant produced vegetatively from a cutting, genetically identical to the plant it was taken from.

Mother plant

A plant held permanently in vegetative growth as a source of cuttings, producing nothing harvestable itself.

Viroid

A small infectious agent that spreads through vegetative propagation, frequently symptomless at first and known to reduce yield.

Tissue culture

Propagation from small tissue pieces under sterile laboratory conditions, capable of producing pathogen-free material.

Common catalogue

The European register of agricultural plant varieties permitted for cultivation and marketing in the Union.

The five checks that apply to any product

The batch certificate

Request it with the number printed on the packaging. A general document for the product line does not cover this batch, and those differences are exactly what it should record.

Total THC

Delta-9-THC plus THCA multiplied by 0.877, because THCA becomes THC under heat and the limit applies to the sum, not to either value alone.

Price per milligram

A division, not an opinion. The only figure that makes two products comparable, whatever the format, process and pack size.

The claims

Without an authorisation number in the EU Register these are assertions, not data — and for cannabidiol that register contains no authorised entry to this day.

The seller’s details

Company name, address and contact. Without them there is also no counterparty to turn to if something turns out to be wrong.

How this connects to the rest

With phenotype variation

Seed produces it and clones eliminate it. The two pages describe opposite sides of the same distinction.

With feminised seed

Feminisation removes sex variation from the seed route without removing any other kind.

With batch consistency

A clone line gives consistent batches. Repeated purchases are the only place a buyer sees this.

With the certificate

Nothing on it records the propagation route. It measures the finished material.

What this is for in practice

When batches vary noticeably

It can indicate a seed crop, or a changed clone line, or a different supplier entirely. It is worth asking which.

When batches are very consistent

It suggests a stable clone line and a producer who maintains it. That is a real signal about an operation.

When a variety is named

Ask whether it is the catalogue name. That is the one attached to a formal examination.

When comparing

The certificate and the per-milligram price. Propagation is upstream and appears nowhere on either.

Frequently asked questions

What is the difference between a clone and a seed? A clone is the same plant continued, genetically identical. A seed is a new recombination of two parents, genetically novel.

Why do commercial growers use clones? Uniformity. Identical plants grow at the same rate and mature together, so a room can be managed and harvested as one unit.

Why do clone lines decline? Accumulated pathogens are the best documented cause. Epigenetic drift and the condition of an ageing mother are also proposed and less established.

Does seed carry the same pathogens? Mostly not. Systemic viruses and viroids generally do not pass through seed, which is why seed is the standard route for establishing clean stock.

What is a mother plant? A plant held permanently in vegetative growth as a cutting source. It produces nothing harvestable and exists purely as overhead.

How long does a cutting take to root? One to three weeks, depending on the variety and the conditions.

What is tissue culture for? Producing clean, genetically identical material at scale, and storing genetics compactly. It requires laboratory facilities.

Which route is cheaper? Cuttings are cheaper per unit but carry the overhead of maintaining mothers. Seed costs more per unit with no ongoing overhead.

Do most operations choose one? No. Seed to find and establish a plant, cuttings to reproduce it, and a return to seed when the line declines.

Is the route recorded anywhere? No. Nothing on a certificate, label or listing says whether a crop came from seed or from cuttings.

What we check and what we do not

We check what can be checked from documents: official registers, declared contents, certificates of analysis, arithmetic. We test no products, rank nothing, and assert no effects.

The interesting thing about this choice is that it is not really a choice. Almost every operation does both, because the two routes do different jobs: seed provides the variation that selection needs, and cuttings provide the reproduction that production needs.

What varies between operations is the discipline around the parts that fail quietly — screening mothers for pathogens, replacing lines before they decline visibly, and knowing when to go back to seed. None of that appears on any document, and consistency across repeated purchases is the only place a buyer ever sees it.