The eggs are laid in small groups on the needles or leaf stems of its host plants, and hatch in spring. The nymphs go through 5 instar stages before moulting into adults. In the United States, the species is univoltine, but in southern Europe, it completes two generations a year, and in tropical Mexico even three. In the northern parts of its range, these bugs start to move about widely by September or so to seek crevices for overwintering; they may become a nuisance in areas with extensive conifer woods, as they will sometimes enter houses in considerable numbers. They have the potential to become structural pests, as it has been found that they will sometimes pierce PEX tubing with their mouthparts, resulting in leakage.