MarijuanaClones

A clone is a cutting. Someone takes a short length of stem with a few leaves on it, removes it from a living plant, and puts it somewhere humid where it can grow its own roots. Once those roots appear, the cutting is a self-supporting plant. Nothing has been crossed, nothing has been pollinated, and no new combination of genes has been created.

That last point is the whole reason cloning exists. Cannabis is dioecious, which means individual plants are usually male or female rather than both. Growing from seed involves two parents and produces siblings that differ from each other, in the same way human brothers and sisters differ. A cutting skips reproduction entirely. It is a piece of tissue that carries on growing, so it stays genetically identical to the plant it came from.

Botanically this is nothing exotic. Vegetative propagation is how commercial growers handle apples, grapes, roses, potatoes, bananas and most houseplants. Every Bramley apple tree in Britain traces back to a single seedling grown in a Nottinghamshire garden in the early 1800s, kept going by grafting rather than by seed. Cannabis is simply one more plant that roots readily from cuttings.

A clone is not a copy of a plant. It is a continuation of the same plant, growing in a second place.

That distinction matters when people ask how good a clone is. A cutting cannot be better or worse than its parent genetically, because it has the same genes. What it can be is healthier or sicker, better rooted or barely rooted, well looked after or neglected. Those are conditions, not genetics, and they are the things that actually vary between one cutting and another.

Neither method wins outright. Clones and seeds trade different advantages, and which one suits a situation depends on what the grower is trying to achieve. The table below rates both across ten practical factors. Tick the factors that matter to you and the scoring shifts to match.

Read the pattern rather than the totals. Clones win wherever the goal is repeatability: same plant, same behaviour, no surprises. Seeds win wherever the goal is optionality: new combinations, clean starting material, stock that keeps in a drawer. A grower chasing consistency and a grower hunting for something new are answering different questions, and the honest answer is that they should probably use different methods.

Clones have to come from somewhere, and that somewhere is a mother plant: a female kept permanently in vegetative growth so cuttings can be taken from it repeatedly. Cannabis flowers in response to longer nights, so a mother is held under a long photoperiod, commonly eighteen hours of light or more, which keeps it growing leaves and branches instead of flowering.

Selecting a mother is the part that actually requires judgement. A grower usually germinates a batch of seeds, grows them out, observes how each individual behaves, and keeps cuttings from the one or two that stood out. Everything that comes afterwards inherits that decision. Choose well and you have a plant worth repeating for years. Choose in a hurry and you have committed a lot of future effort to something mediocre.

What growers look at when selecting

• Structure. Branching pattern, internode spacing and how the plant fills the space it is given.
• Vigour. How quickly it recovers from being topped, moved or trimmed.
• Resilience. Whether it shrugs off minor stress, or sulks for a fortnight.
• Aroma and resin. Assessed on the flowering siblings or on a test run of the plant itself.
• How readily it roots. Some individuals root in under a week and some take three. Over years, that difference adds up.

Two words explain most of the confusion around clones. The genotype is the genetic code a plant carries. The phenotype is what that code produces once the plant has actually grown, shaped by light, temperature, humidity, root space, feeding and handling.

All clones from one mother share a genotype. They do not automatically share a phenotype. Put the same cutting in a bright well-run room and in a cramped cupboard and you get two plants that look and smell noticeably different, despite being genetically the same plant. This is why two people can grow the identical cutting and reach opposite conclusions about it.

Why named varieties still vary

A cross between two parents produces seeds that are all entitled to the same name, yet each one is a different individual. When growers talk about hunting for a keeper, this is the process they mean: grow out a population, find the individual worth repeating, take cuttings from it. That selected individual is often called a cut, and it is why the same variety name can describe plants that behave quite differently depending on which line someone is working with.

Cloning does not improve genetics. It preserves a decision that was already made.

There is a second consequence that matters for anyone comparing plants. Because a clone reproduces the phenotype only when conditions are reproduced too, a cutting is a much more useful thing to compare than a seed. If two rooms grow the same cut and get different results, the difference is environmental, and it can be traced. That makes clones a diagnostic tool as well as a propagation method.

Not every piece of a plant roots equally well. Where a cutting is taken from changes how fast it roots and how it grows afterwards.

Apical or tip cuttings

Taken from the growing tip of a branch, generally with two or three sets of leaves. These are the standard choice. Tip growth is young, actively dividing tissue, and it roots readily. Plants from tip cuttings tend to grow upright with a clear main stem.

Lower branch cuttings

Taken further down the plant, where growth is older and often woodier. These usually root more slowly and can start out growing sideways rather than up, since they carry the branch's original orientation. They catch up, but they take longer to look like a normal plant.

Monster cropping

A technique where cuttings are taken from a plant that has already begun flowering. The cutting has to revert to vegetative growth before it behaves normally, which shows up as odd, rounded, single-fingered leaves for a couple of weeks. It roots slowly and looks strange while it reverts, but it does work, and it produces heavily branched plants.

Tissue culture

Not a cutting in the ordinary sense. A very small piece of plant tissue, sometimes just the meristem at the growing point, is grown on a sterile nutrient gel in a sealed vessel. It is more demanding and needs proper sterile technique, but it stores a lot of genetics in very little space and, done from meristem tissue, is one of the few reliable routes to clearing a viroid infection from a line.

A fresh cutting has no roots and cannot take up water in the normal way, yet it still loses water through its leaves. Everything about the rooting period is aimed at that single problem: keep the cutting alive long enough for it to build roots.

Humidity does the heavy lifting. Kept in a humid enclosure, the air around the leaves is close to saturated, so very little water escapes and the cutting can hold on. Plant cells near the cut site then dedifferentiate, meaning they revert to a more general state, and begin producing root tissue. These are adventitious roots, growing from stem rather than from an existing root system, and they are the reason cuttings work at all.

What the process depends on

• Humidity around the leaves, high at first and reduced gradually once roots form, so the plant hardens off instead of wilting the moment it is uncovered.
• Mild, steady warmth at the base. Root formation is temperature sensitive and slows considerably when the medium is cold.
• Gentle light. Enough to keep the cutting photosynthesising, not so much that it demands more water than it can supply.
• A clean cut made with a sterile blade, usually at an angle to expose more surface, taken just below a node where rooting hormone concentrates naturally.
• Reduced leaf area. Larger leaves are often trimmed back to cut water loss while the cutting has no way to replace it.

Rooting compounds, whether gel, powder or liquid, supply auxins, the plant hormone class that triggers root initiation. They are helpful rather than essential. Cannabis roots without them, just less consistently and usually more slowly.

A cutting is ready to move on when roots are visible and beginning to branch, not at the first white tip. Moved too early, the root system cannot support the plant in a larger volume of medium. Left too long in a small cell, roots circle and bind, and the plant stalls after transplanting.

Seeds are patient. A cut is not. Once a particular individual has been selected, the only way to still have it in five years is for some living tissue descended from it to have survived every one of those years without interruption. Lose it and it is gone, because it cannot be recreated from seed. Seed from the same cross produces siblings, not the same plant.

This is why long-standing cuts acquire reputations and get passed between growers for decades. It is also why the practical side of preservation gets so much attention.

How preservation is handled

• A dedicated mother. Simple and reliable, but it consumes light, space and attention permanently.
• Rolling cuttings. No permanent mother. Cuttings are taken from cuttings on a schedule, so the line continues without one plant tying up a corner of the room.
• Tissue culture. Dozens of lines held in small vessels, with far less space and routine work once the technique is established.
• Sharing. The oldest method of all. A cut held in several places at once survives one grower's power cut, pest outbreak or house move.

The one real weakness of cloning is that living tissue carries whatever the source plant was carrying. Seeds transmit very little. Cuttings can bring in spider mites, aphids, thrips, fungus gnat larvae in the medium, powdery mildew, root pathogens and, most awkwardly, viroids.

Hop latent viroid

Hop latent viroid, usually shortened to HLVd, is the infection that has caused the most trouble in cannabis over the past decade. It is a viroid, meaning a very short circular strand of RNA with no protein coat, and it spreads mainly through mechanical contact: contaminated blades, hands, and propagation from infected mother plants.

The reason it spread so widely is in its name. Latent means an infected plant can look entirely normal. Symptoms, when they show, are unhelpfully vague: stunted or brittle growth, shortened internodes, reduced aroma, plants that simply underperform without any obvious cause. Growers frequently spend a long time adjusting feeding and environment before the possibility of infection is even considered. Reliable identification is done by laboratory testing rather than by eye.

A cutting inherits the mother's health as faithfully as it inherits her genetics.

What limits the risk

• Sterilising blades between plants, not just between sessions. Mechanical transmission is the main route.
• Quarantining anything new away from the main room for a few weeks before it joins the collection.
• Testing mother plants rather than trusting appearance, since latent infection is invisible.
• Retiring an infected line instead of propagating from it, or re-establishing it through meristem tissue culture.
• Inspecting undersides of leaves on arrival, where mites and eggs sit.

None of this is unique to cannabis. Certified clean stock schemes exist across horticulture precisely because vegetative propagation is efficient at multiplying pathogens along with plants. Anyone who has dealt with virus in a strawberry runner bed or a raspberry cane will recognise the pattern exactly.

"Clones get weaker every generation"

They do not. There is no mechanism by which taking a cutting degrades the genome, and cuttings of cuttings of cuttings remain genetically identical to the original. What people are usually observing is accumulated pathogen load, or a mother plant that has been kept in poor conditions. Both are health problems with health explanations.

"A clone is younger than its mother"

Not in the way the phrase suggests. A cutting is the same tissue, continuing. What resets is the plant's growth stage: a cutting taken from a mature plant returns to vegetative growth and starts again from a small size. Its cells are as old as the plant they came from.

"Clones do not need a rest after being taken"

They very much do. For the first days a cutting is running on stored resources with no root system at all. Handling it, moving it about, feeding it heavily or exposing it to strong light during that window is how most cuttings are lost.

"Rooting hormone is essential"

It is not. Cannabis roots without it. Hormone products make rooting faster and more consistent, which matters at scale, but plenty of cuttings root in nothing more than water.

"Any cutting from a female is guaranteed female"

Genetically, yes, it is female. But sex expression in cannabis is not purely genetic. Severe or prolonged stress, particularly light interruption during flowering, can cause a genetically female plant to produce pollen sacs. The genotype has not changed. The plant's response to conditions has.

Adventitious roots

Roots that form from stem tissue rather than from an existing root system. What a cutting grows.

Auxin

A class of plant hormone that triggers root initiation. The active ingredient in rooting products.

Cut

A specific selected individual maintained as clones, as distinct from the variety name it belongs to.

Dioecious

Having male and female reproductive parts on separate individual plants, as cannabis usually does.

Genotype

The genetic code a plant carries. Identical across every clone from one mother.

HLVd

Hop latent viroid. A small infectious RNA that spreads through contact and often shows no clear symptoms.

Internode

The length of stem between two nodes. Short internodes make for a compact plant.

Meristem

Undifferentiated tissue at growing points where cell division happens. The starting material in tissue culture.

Mother plant

A plant held permanently in vegetative growth as a source of cuttings.

Node

The point on a stem where leaves and branches emerge. Cuttings are normally taken just below one.

Phenotype

The plant that a genotype actually produces once environment has had its say.

Photoperiod

The daily light and dark cycle. Length of darkness is what triggers flowering in most cannabis.

Taproot

The central descending root a seedling forms. Cuttings do not produce one.

Vegetative growth

The stage where a plant produces stems and leaves rather than flowers.

Viroid

An infectious agent smaller and simpler than a virus, made of RNA with no protein coat.