Name a common method to control slugs in ornamental gardens.

Handpicking, traps, or applying iron phosphate baits are commonly used methods for controlling slugs in ornamental gardens. This approach is practical because it targets slugs directly and can be highly effective in reducing their population. Handpicking involves manually removing slugs from plants, which can help eliminate them before they cause significant damage. Traps, such as beer traps, attract slugs and can help capture them in a contained environment.

Iron phosphate baits serve as an effective chemical control option that is less harmful to pets and wildlife while still effectively reducing slug populations. Iron phosphate works by disrupting the digestive system of slugs, leading to their demise, and is considered a more environmentally friendly alternative compared to more toxic chemicals.

The other options, although they have their merits, are either less direct in managing slug populations or not as effective as the integrated approach provided by handpicking, traps, and iron phosphate.