Solitary bees are gentle bees and are wonderful pollinators to increase vegetable, flower and fruit yields in your garden. From March to August these bee species will lay eggs in the tubes and create a series of cells from mud or leaf. The larvae will develop over the winter period in the tubes and will then emerge the following spring. Ensure that your own bee box is well-insulated or overwinter your full bee box in shed or garage. If left outside cover the full tubes with wire mesh to prevent predation from greedy woodpeckers.