There are several plants that work amazingly as companion plants for Cannabis. It’s wise to grow these helpful flora near your weed cultivars both indoors and outdoors in order to repel and deter pests without having to resort to harmful chemicals.
Along with utilizing beneficial insects such as ladybugs, predator mites and praying mantises, companion plants and cover crops (like alfalfa, rye and clover) are part of the Permaculture approach to pot farming. It’s an important part of IPM (Integrated Pest Management) by using prevention to reduce the use of any synthetic inputs that might taint your flowers.
Some people like having citronella plants (a type of geranium) around, but unfortunately, the only bugs that citronella actively repel are mosquitoes and they don’t eat plants, only us. Fortunately, if you do have an issue with mosquitoes biting you in your outdoor garden or while grilling, you can use these plants to keep them away.
Nasturtium and bean stalks attract pests and can be used as a “canary in the coal mine” to discover infestations before they’ve made much headway on your plants.
Chrysanthemum (“mums”) discourage and repel many pests by overwhelming them with scent. This can also keep away human “pests and predators” (or “Police and Thieves” as the late great reggae singer Junior Murvin called them), that might be drawn to your weed plants by their distinctive odor.
Marigolds will help keep away whiteflies while peppermint deters aphid and deer populations. Also, dill discourages spider mites, butterflies and caterpillars. Coriander is great for keeping away aphids and spidermites. Basil, peppermint and lavender attract beneficial insects while repelling snails and slugs making them great companion plants for Cannabis as well.