Bumble bees are among the most important pollinators in nature, and now you can improve the conditions for these useful animals with a bumble bee house - or castle as the manufacturer rightly calls it.

In the spring, the bumble bee queen uses the house as a nest, in the fall as a den for the winter.

The housing consists of a top and a bottom plate and can thus be easily opened for cleaning. But the lid is heavy at the same time, so it doesn't just fall off. Wool is included as a good start for nest building.

The bumble bee nest is made of a material Denk calls Granicium. It is basically pure granite that has been heated to such high temperatures that it melts, after which it can be shaped. It is thus a 100% natural product that is extremely hard and durable. Denk gives a full 15-year guarantee on the material.

The opening is painted blue, as bumblebees are attracted to this color.