There is nothing more annoying than uninvited guests infesting your plants. Aphids, spider mites or thrips can quickly spoil the fun of your grow. But don’t worry: with a few simple tricks for prevention and quick action in an emergency, you can stay in control.
đź§ąCleanliness is a must
The best weapon against pests is a hygienic growing environment.
- Keep your tent and the space around it clean.
- Mop and vacuum regularly – mold spores and pest eggs won’t stand a chance.
- Always disinfect tools such as scissors before each cut (e.g. with alcohol or hydrogen peroxide).
👉 Sounds banal, but works wonders.
🦟 Beneficial insects instead of chemicals
You don’t have to reach for the poison syringe – nature has long since invented your helpers.
- Lacewing larvae:
- Effective predators that target aphids, thrips and spider mites.
- Simply buy a packet, hang it on the plants and the little helpers will do the rest.
- Nematodes:
- Tiny nematodes that eat the larvae and eggs of pests in the soil.
- Application: Mix the powder into the irrigation water and water as normal.
- You only need to repeat this for acute infestations – a single application is sufficient as a preventative measure.
Aphids (source: https://www.cannaconnection.de/blog/18907-blattlaeuse-und-marihuana-praevention-identifikation-und-behandlung)

Thrips (source https://www.compo.de/ratgeber/krankheiten-schaedlinge/insektenbefall/thripse:)

Spider mites (source: https://www.hanfgartenshop.de/magazin/spinnmilben-auf-cannabispflanzen-verhindern)

Fungus gnats (source: https://www.royalqueenseeds.de/blog-wie-du-trauermuecken-davon-abhaeltst-deine-cannabispflanzen-zu-befallen-n345)

🟨 Control with yellow boards
Spotted an insect? No need to panic yet.
- Set up a yellow board.
- Observe whether it remains a loner or whether an infestation really develops.
- Individual insects may simply have strayed – a real infestation is indicated by repeated sightings.
🚨Act quickly in the event of an infestation
If you are sure that your plants are infested: react immediately!
- Early control prevents pests from multiplying explosively.
- Use your beneficial insects again (lacewings, nematodes) or other biological methods.
- Chemicals are only a last resort – and are almost always counterproductive in indoor growing.
đź§ľ Brief summary
Cleanliness in the tent is the best prevention. Rely on beneficial insects such as lacewing larvae and nematodes, monitor with yellow boards – and act immediately if an infestation is clearly recognizable.