20 Ways to Get rid of Slugs.

Adjusting the watering schedule: Slugs tend to be more active in damp conditions, so adjusting the watering schedule can help make the soil less hospitable for them. Water the plants in the morning so the soil has a chance to dry out during the day. Avoid watering in the evening as this can create moist conditions that slugs love.
Beer traps: Beer traps are an effective way to get rid of slugs. Simply bury a container, such as a plastic cup, in the soil so the rim is level with the surface. Fill the container with beer and wait for the slugs to fall in and drown. Empty the container regularly and refill with fresh beer.
Seaweed mulch: Seaweed mulch can act as a deterrent to slugs, as the salt content in seaweed can be abrasive to their bodies. Spread a layer of seaweed mulch around the base of your plants to help keep slugs away.
Copper barriers: Copper barriers can be an effective way to repel slugs, as they don’t like to touch copper. You can create a barrier around your plants using copper tape or strips. Make sure the copper barrier is at least 3-4 inches wide and free of any gaps.
Diatomaceous earth: Diatomaceous earth is a powder made from the fossilized remains of diatoms. It is abrasive to slugs and can help to dehydrate them. Sprinkle a thin layer of diatomaceous earth around the base of your plants or on the soil surface. Be sure to reapply after rain or watering.
Lava rock barriers: Lava rocks can be used to create a barrier around plants to prevent slugs from reaching them. The sharp edges and rough surface of the rocks make it difficult for slugs to crawl over them. Place the lava rocks around the base of plants or create a perimeter around the garden bed.
Salt (use with caution): Salt can be an effective way to get rid of slugs, but it should be used with caution as it can harm plants and soil if used in excess. Sprinkle a small amount of salt directly on the slugs or on areas where they are present. Be careful not to get salt on plants, and use it sparingly.
Overturned flowerpots or grapefruit halves: Overturned flowerpots or grapefruit halves can be used as a trap for slugs. Place them in areas where slugs are present, and the slugs will crawl into the pots or under the grapefruit halves seeking shelter. Check the pots or grapefruit halves regularly and remove any slugs that are trapped.
Board-on-ground traps: Boards or pieces of cardboard can be used as traps for slugs. Place them in areas where slugs are present, and the slugs will crawl under them seeking shelter. Check the boards or cardboard regularly and remove any slugs that are trapped.
Garlic-based slug repellents: Garlic has a pungent smell that slugs find repulsive, so it can be used as a natural slug repellent. To use garlic as a repellent, crush a few cloves and mix them with water to make a spray. Then, spray the mixture on plants or areas where slugs are present. Reapply the spray every few days or after rainfall.
Coffee ground barriers: Coffee grounds are known to repel slugs due to their high caffeine content, which acts as a natural deterrent. To use coffee grounds as a barrier, sprinkle them around the base of plants or on the soil surface. Reapply the coffee grounds every few days or after rainfall.
Nematode application: Nematodes are microscopic, worm-like creatures that are natural predators of slugs. To get rid of slugs they can be applied to soil and will seek out and attack slugs. To use nematodes, follow the instructions on the package and apply them to the soil when slugs are active.
Slug-proof fencing: Fencing can be used to create a physical barrier around a garden or specific area to prevent slugs from entering. The fence should be at least 4 inches high and buried at least 2 inches deep to prevent slugs from crawling underneath.
Handpicking: Handpicking is a manual method of slug control that involves physically removing slugs from plants or the garden. This method is best done in the early morning or late evening when slugs are most active. Use gloves and a container of soapy water to dispose of the slugs.
Companion planting: Companion planting involves planting certain plants together that have a mutually beneficial relationship. Some plants can repel slugs, while others can attract natural predators of slugs. Examples of companion plants for slug control include garlic, chives, fennel, and mint.
Iron phosphate baits: Iron phosphate baits are a type of slug bait that is considered to be more environmentally friendly than traditional metaldehyde baits. Iron phosphate is a naturally occurring compound that is not toxic to humans, pets, or wildlife. These baits work by attracting slugs and snails and then killing them when they consume the bait. To use iron phosphate baits, sprinkle the pellets around plants or in areas where slugs are present. Follow the instructions on the label for application rates and reapplication.
Slug-repelling plants: Some plants have been found to repel slugs and snails naturally. These include plants with strong odors or those that have rough or prickly leaves, such as lavender, rosemary, thyme, sage, and fennel. Planting these types of plants around vulnerable plants can help deter slugs from approaching. However, keep in mind that not all plants work equally well for all situations, so it’s important to do some research to determine which plants are best for your specific needs.
Natural predators (e.g. ducks, chickens): Ducks and chickens are natural predators of slugs and snails and can be an effective way to get rid of slugs. By allowing these animals to roam in areas where slugs are present, they will naturally hunt and consume the pests. However, keep in mind that this method may not be feasible for everyone, and care must be taken to ensure that the predators do not harm any other plants or animals in the area.
Electronic slug repellents: Electronic slug repellents work by emitting a high-frequency sound that is unpleasant to slugs and snails, causing them to retreat. These devices can be placed around plants or in areas where slugs are present, and they are considered to be a humane and eco-friendly alternative to traditional slug control methods. However, their effectiveness is somewhat debated, and they may not work for all situations.
Slug tape: Slug tape is a copper tape that can be wrapped around pots or planters to prevent slugs from climbing up and reaching vulnerable plants. The copper in the tape gives off a slight electrical charge that slugs find unpleasant, deterring them from crossing the tape. To use slug tape, simply wrap it around the base of the plant pot or planter, ensuring that there are no gaps where slugs can sneak through.

Conclusion:

Based on the list of methods provided, there are many effective ways to control slugs on cannabis plants. Some of the most popular and effective methods include using copper barriers, diatomaceous earth, handpicking, nematodes, and slug-proof fencing.

Handpicking and using beer traps can be the cheapest options, but they may not be as effective as other methods. Additionally, methods such as companion planting and natural predators can be beneficial for long-term control of slug populations.

It’s important to note that the effectiveness of each method may vary depending on the severity of the slug infestation and the individual circumstances of your garden. Therefore, it’s recommended to use a combination of methods to increase your chances of success.

Overall, controlling slugs on cannabis plants requires some effort and experimentation, but with the right combination of methods, it’s possible to effectively manage and prevent slug damage.