Around the pest house there is rank grassland and scrub with flowering plants such as hemlock ( " Conium maculatum " ), hogweed ( " Heracleum sphondylium " ) and good populations of balm-leaved figwort ( " Scrophularia scorodonia " ) which is spreading in one area.
12.
Concealer moths have also been put to useful service . " Agonopterix ulicetella ", a native of Europe, has been introduced to New Zealand and Hawaii in an attempt to control the European gorse ( " Ulex europaeus " ), and the defoliating hemlock moth ( " Agonopterix alstroemeriana " ) has been used against " Conium maculatum " poison hemlock in the United States.
