Lament for Lost Plants

It doesn't seem to matter how well I garden, every new gardening season brings a few losses. This year I lost a garden staple: my centranthus ruber (aka red valerian). It was a centrepiece in my back centre garden since we built the garden. See the red patch below:

While this garden has changed a bit the last couple of years, I expected the red valerian to remain. It's beautiful dark pink blooms started in June and continued all summer. Now that it's gone, I'm discovering that apparently it's really quite common - so common in fact that I can't find anywhere to buy it!

Another loss this season was our agapanthus which, despite being zone 7, had survived for 6 years and bloomed for 2 of them.