Peggy gets straight to the point when you ask her about it. "People buy a house, hang it up — and then nothing happens. Not a single visitor. And they think butterflies just don't appear in their house. But it's almost always the house that's the problem."
Incorrect slot width. Too wide, and birds will fly straight in—the biggest mistake. Too narrow, and butterflies won't find an entrance at all. The correct width is less than one centimetre. This is rarely adhered to in mass-produced goods because it makes manufacturing more complex.
No puddler. That's the detail most people overlook. Butterflies don't drink from open dishes—they absorb minerals from moist, sandy substrate. A butterfly house without a puddler is like a birdhouse without water. It looks like a home, but it isn't.
Painted or treated wood. Smells of chemicals. Butterflies are sensitive to foreign smells—it's their survival mechanism. Many inexpensive houses are treated with varnish or wood preservative to make them look good in shops. In the garden, they remain empty.
Decorative form without function. "I see these painted wooden houses from the garden centre," says Peggy. "Nice to look at. But inside there's nothing—no structure, no depth, no protection. A butterfly needs narrow, dark hiding places. Not an open cavity that every wind blows through."
Cheap materials that fail after one season. Particleboard swells, plywood peels, thin panels warp. A butterfly house made of poor-quality materials becomes hazardous waste after two winters. Peggy's houses are made of untreated solid wood—robust, weather-resistant, and only more beautiful with age.