Slugs refer to all terrestrial gastropod mollusks that have no shells. The term is, however, wide and refers to all gastropod mollusks without shells, including aquatic species. Snails, on the other hand, refer to gastropods that have coiled shells, often large enough to cover the animals when they retract inside. Slugs and snails affect greenhouse plants because they chew the tender leaves of your crops. Read below for some tips on organically controlling slugs and snails inside your very own greenhouse kit.
1. Adjust your watering schedule
Slugs are active at night and especially if the garden is damp. If you sight them, avoid watering just before nightfall and instead, do it in the morning. Altering watering schedules will substantially reduce slug infestation because they will find the dry soil undesirable.
2. Use diatomaceous earth
This dust is effective because it lacerates slugs and snails, making them lose water and die. You can sprinkle it around the problem areas or around individual plants. You can also mix it with water and sprinkle as a foliar spray.
3. Clean up your greenhouse
A simple cleanup is effective because it helps clear breeding sites. While cleaning, also remove all rubbish in the garden as well as unnecessary material such as wooden boards and anything that may conceal the snails and slugs.
4. Plant "repellent" herbs
Anise, rosemary, fennel, wormwood and rue are an effective snail and slug repellent. If you plant any of these near the patches of plants in your greenhouse then you will eliminate the snail and slug menace.
5. Parasitic nematodes
You can use Phasmarhabditis hermaphrodita, which is a facultative parasitic nematode that targets slugs. While it is completely harmless to pets, wildlife and children, this nematode attacks slugs and infect them with bacteria, which in turn, kills the slug. The nematode then eats the decomposing body of the slug.
6. Mulch using seaweed
Mulching using seaweed is an effective method of deterring snails because it repels them. In addition, when it dries it becomes rough, and slugs and their delicate bodies cannot stand rough matter.