# Tissue culture basics for cannabis growers and breeders

> Tissue culture grows small pieces of a plant (usually nodes or shoot tips) on a sterile gel medium, giving clean, compact, long-lived backups of clones and a route to cleaning up infected stock. Cannabis tissue culture works but is genotype dependent and poorly replicated in the literature; contamination control is the main skill.

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- Category: Breeding · Level: Advanced
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- Stage: Veg · Systems: Any system
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Questions and answers

**What is cannabis tissue culture?** Cannabis tissue culture, or micropropagation, is growing small plant pieces such as nodal segments or [shoot tips](https://genetixbay.com/knowledge/glossary/apical-meristem.md) in sterile jars on a gel of nutrients, sugar and plant growth regulators. It runs through initiation, multiplication, rooting and acclimatisation. Its main uses are space-saving clean clone banks and producing pathogen-tested stock, since hundreds of [genotypes](https://genetixbay.com/knowledge/glossary/genotype.md) fit on a shelf.

**Can I do tissue culture at home?** Yes, cannabis tissue culture is learnable at home, but most failures come from contamination, often from internal bacteria in a dirty mother. Published protocols often work on only one or two cultivars, so expect to adjust. Handle pressure cookers, bleach and 70% ethanol safely, and never open a pressure vessel under pressure.

**Does tissue culture remove [viroids](https://genetixbay.com/knowledge/glossary/viroid.md)?** Tissue culture can help remove viroids such as HLVd, but it is not guaranteed. Meristem or shoot-tip culture combined with testing is a standard route to pathogen-free stock in many crops and is used for cannabis, yet viroids are hard to eliminate and cannabis elimination rates are poorly documented. Test every plantlet before release.

**What medium is used for cannabis tissue culture?** Cannabis tissue culture typically uses MS or DKW basal salts, with DKW often reported to perform better for shoots depending on genotype, plus about 2-3% sucrose (20-30 g/L) and 6-8 g/L agar or gellan gum at [pH](https://genetixbay.com/knowledge/glossary/ph.md) 5.7-5.8. A [cytokinin](https://genetixbay.com/knowledge/glossary/cytokinin.md) drives multiplication and an [auxin](https://genetixbay.com/knowledge/glossary/auxin.md) such as IBA drives rooting. Exact concentrations vary by protocol.

**How long can a cannabis clone be kept in tissue culture?** Published cannabis protocols set no firm maximum time a clone can be kept in tissue culture; it is maintained by repeated transfers, with active multiplication cycles of about 3-6 weeks. Culture is nearly but not perfectly a genetic freeze, so slow-growth storage at lower temperature with fewer transfers is used to reduce cell divisions and the variation they cause.

**Short answer.** Tissue culture (micropropagation) means growing small plant pieces in sterile jars on a gel of nutrients, sugar and plant growth regulators. For cannabis its main uses are clean, space-saving clone banks and producing pathogen-tested stock. It is learnable at home, but most failures are contamination, and published protocols often work on only one or two cultivars [1].

## What's happening

Plant cells can regrow shoots and roots when given the right nutrients and hormone balance. In culture there are no pests and little space needed, so hundreds of genotypes fit on a shelf. Monthony et al. (2021) reviewed the field and found important gaps: many studies used hemp as a stand-in for drug-type cannabis, tested one cultivar, or were not independently replicated [1] (*Supported* as a caution).

## The stages

| Stage | What happens | Typical duration |
|---|---|---|
| 0. Mother prep | Clean, pest-free, tested mother; spray-free for a while | 2-4 weeks |
| I. Initiation | Surface-sterilise nodal segments or shoot tips; place on medium | 2-4 weeks |
| II. Multiplication | Shoots grow and are subdivided | 3-6 weeks per cycle |
| III. Rooting | Transfer to rooting medium (often auxin) | 2-4 weeks |
| IV. Acclimatisation | Move to plugs under high humidity, then [harden off](https://genetixbay.com/knowledge/glossary/hardening-off.md) | 1-3 weeks |

Durations are indicative (*Grower practice* and [1][2]).

## Media and conditions

| Factor | Common choice | Notes |
|---|---|---|
| Basal salts | MS (Murashige and Skoog) or DKW (Driver and Kuniyuki walnut) | DKW often reported to perform better for cannabis shoots (*Supported*, genotype dependent) [1] |
| Sugar | Sucrose ~2-3% (20-30 g/L) | |
| Gel | Agar ~6-8 g/L or gellan gum | |
| pH | ~5.7-5.8 before autoclaving | |
| Cytokinin (multiplication) | e.g., meta-topolin or BAP at low µM | Concentrations vary by protocol [1][2] |
| Auxin (rooting) | e.g., IBA | |
| Temperature | ~22-25 °C (72-77 °F) | |
| Light | ~16 h, low intensity ~30-60 [µmol/m²/s](https://genetixbay.com/knowledge/glossary/ppfd.md) | |

These are typical ranges across published protocols; check the protocol you follow for exact values.

## Does it clean up HLVd?

Meristem (shoot-tip) culture combined with testing is a standard route for producing pathogen-free stock in many crops, and is used for cannabis. Viroids can be difficult to eliminate and success is not guaranteed; every plantlet must be tested before release [3] (*Supported* for the approach; elimination rates in cannabis are poorly documented).

## Is it a perfect genetic freeze?

Nearly, but not perfectly. Somatic mutations occur in all dividing tissue [4], and culture can add some variation (somaclonal variation) depending on method. Slow-growth storage (lower temperature, fewer transfers) reduces the number of cell divisions (*Supported* in general plant [TC](https://genetixbay.com/knowledge/glossary/total-cannabinoids.md)) [1].

## Safety

- Autoclaves and pressure cookers: follow the manufacturer's instructions; never open under pressure.
- Bleach ([sodium](https://genetixbay.com/knowledge/glossary/sodium.md) [hypochlorite](https://genetixbay.com/knowledge/glossary/free-chlorine.md)) for surface sterilisation: gloves and eye protection; never mix with acids or ammonia.
- Ethanol (70%) and flame or bead sterilisers near each other are a fire risk. Keep ethanol closed and away from flames.

## Common mistakes

- Starting from a dirty mother. Internal bacteria show up weeks later.
- Copying one paper's hormone recipe and expecting it to work on every cultivar.
- Skipping acclimatisation humidity: plantlets lose water fast in normal air.
- Calling tissue culture "[virus](https://genetixbay.com/knowledge/glossary/plant-virus.md) free" without tests.

## Evidence

- Feasibility and limitations of cannabis TC: *Supported* (reviews) [1][2].
- DKW vs MS for cannabis: *Supported*, genotype dependent [1].
- Viroid elimination through meristem culture: *Grower practice* / limited published data [3].

## Sources

1. Monthony AS, Page SR, Hesami M, Jones AMP. 2021. The past, present and future of Cannabis sativa tissue culture. Plants 10(1):185. https://doi.org/10.3390/plants10010185
2. Adhikary D, Kulkarni M, El-Mezawy A, et al. 2021. Medical cannabis and industrial hemp tissue culture: present status and future potential. Frontiers in Plant Science 12:627240. https://doi.org/10.3389/fpls.2021.627240
3. Adkar-Purushothama CR, Sano T, Perreault JP. 2023. Hop latent viroid: a hidden threat to the cannabis industry. Viruses 15(3):681. https://doi.org/10.3390/v15030681
4. Adamek K, et al. 2022. Accumulation of somatic mutations leads to genetic mosaicism in cannabis. The Plant Genome 15(1):e20169. https://doi.org/10.1002/tpg2.20169