What Is Eating My Spinach and Kale at Night?

You go to bed with healthy, full plants and return in the morning to find ragged holes or entire leaves eaten away. Overnight feeding damage on spinach and kale is most commonly slugs or snails, which are highly active in dark, damp conditions. Confirming the culprit before applying control saves you treating the wrong pest, and for edible leafy crops, using the right type of control matters.

Confirming slugs as the cause

Check for slugs and snails in the evening an hour or two after dark with a torch — you will find them feeding on or near the plants. Slug damage has characteristic smooth-edged, irregular holes and often a glistening slime trail on or around the leaves. Snails leave the same damage plus their shells may be visible on nearby walls or surfaces during the day. If you find no slugs at night, look for caterpillars — the other major overnight feeder — which are active on the plant rather than arriving from the soil.

Slugs love spinach especially

Spinach is one of the most attractive plants in the garden to slugs — the soft, moisture-rich leaves are easy to eat and digested quickly. Young spinach seedlings can be completely destroyed in a single night by a small number of slugs. Kale is tougher and less palatable, though young kale plants are still vulnerable. The most critical protection period is the first three to four weeks after germination or transplanting, when the plants are small and easily overwhelmed.

Effective controls for leafy crops

Ferric phosphate slug pellets are approved for use on edible crops and in gardens with wildlife — they break down into iron and phosphate in the soil and do not harm birds, hedgehogs, or pets. Apply a sparse ring around each plant rather than a heavy dose everywhere. Nematodes (Phasmarhabditis hermaphrodita) applied to moist soil control slugs underground before they reach the plants and are the most wildlife-friendly approach. Traditional metaldehyde pellets should not be used around food crops. Copper tape as a container barrier and a scratchy mulch of sharp grit around seedlings create physical deterrents that reduce slug access.

Night patrol and habitat reduction

Going out an hour after dark with a torch and a bucket of soapy water to collect and dispose of slugs is time-consuming but highly effective, especially around seedlings. Reducing slug habitat around the growing area — clearing debris, old compost bags, and leaf litter where slugs shelter during the day — reduces the overnight population significantly. Keeping the soil surface firmer and less mulched during peak slug seasons (autumn and spring) also helps, though this must be balanced against the moisture benefits of mulching.