I have two bushes of these planted on the top of the hedge either side of the poly tunnel door. It has an amazingly strong smell with flowers that last all through the summer. I find it a most effective screen for all the vulnerable plants in the poly tunnel that greenfly and whitefly love. With this wafting its smell around there is little chance of these pests discovering them. They have guarded the poly for many years now with barely a greenfly to be seen. On the rare occassion these green/whitefly have been noticed our second line of attack are with lady birds. The children go collecting them and pop them in the poly to finish off the small invasion!