Pulsatilla bungeana

A very lovely Chinese pasque flower with the nearest blue flowers I've seen in the group.

Easy and hardy in 'alpine' conditions (freely drained but not parched soil and full exposure to the sun and air).

This is the parent plant in a garden in Ontario. Thanks to Rob & Sharon Illingworth for the seeds.
1L pots ~ £7

Vitex negundo Heterophylla

A hardier Chinese species than agnus-castus that seems to flower over a longer period in summer so possibly better for ordinary garden conditions. The flower spikes are looser and paler and the leaflets are broader and paler.

In the form Heterophylla, the foliage is attractively toothed and the whole effect is fresh and light. Can make a large shrub in a sunny spot.
2L pots ~ £8