Wide ranges of Hebe cultivars habve been one of the recent "new things" in our local nursery trade. Local nurseries have been propagating different clones of a good number of species/cultivars recently and making them an easily available ornamental, which makes them very affordable and useful as plants giving texture, several flowering episodes per year or interesting shapes.
I have 10 different cultivars here, and I use them in close relationship with eucalypts, in order to be able to show they grow perfectly okay as understorey for these trees. Being from NZ, no one can argue they are "adapted" to grow under them naturally, and this helps to see the "nothing grows under eucalypts because they poison the soil" is mostly a myth, at least at garden scale :)