They are most often seen in moist conditions, which create an abundance of food.

Slugs love the cool, moist conditions that you have just created.

The warm and moist conditions are the perfect combination of home and food source.

This plant grows best in very moist conditions as its home is the margins of rivers.

This plant prefers full or partial sun and moist conditions.

Willow is another wood with good resistance to moist conditions.

Flowering usually takes place during rainy season, but flowers can appear throughout the year in moist conditions.

They can also be subject to phytophthora root rot in moist, hot conditions.

They prefer good soil, adequate water and hot moist conditions.

It seems that warm, moist conditions are a pre-requisite for the effect to manifest.