Closely related to F.magellanica but, to my mind at least, a much nicer plant with good quality narrow foliage, a graceful willowy habit and slender red flowers, giving a completely different effect. Reputedly about as hardy as magellanica – these came through the winter in their pots in the tunnel totally unscathed.
Update: hardy outside here, though not evergreen
1L pots ~ £6
Ageratina (Eupatorium) ligustrina
A pleasant not-too-big, glossy domed evergreen for most of the summer, this species comes into its own late in the year with its aromatic pale pink flower heads. Another Mexican - this is fairly hardy but best with shelter from the worst of the weather.
Eupatorium is another genus that was split up recently. This used to be E.ligustrinum.
2L pots ~ £8