The flower bulbs in this mixture help control the Oak processionary caterpillar (Thaumetopoea processionea)in an environmentally friendly way. Based on four years of research, JUB Holland and Silvia Hellingman have put together a flower bulb mixture that attracts natural predators of the Oak processionary caterpillar that feed on them, keeping them out of your garden or environment. The JUB Holland collection of flower bulbs contains a mixture of daffodils, crocuses, blue grapes, anemones, botanical tulips and Chionodoxa. Plant the bulbs near or in the vicinity of oak trees. Leave the flower bulbs in the ground after flowering and allow them to naturalise for a beautiful and helpful flowering display the following season.