A month on, I thought a proper update might be a good idea to be able to look back on.
Whilst all of the other ophipognon black grasses are doing well, this one seems to have turned partially white.
The Wisteria has gone mad. It should provide an excellent frame for the future.
On balance I think in just one month this newest 'room' has thus far been successful. One or two of the plants may have to be replaced in the main bed, but it's too early to decide yet. The Phlox in particular doesn't seem very happy...although it could just be that by the time I return from work the flowers have gone over. My suspicion is that it's too hot in that corner. We'll keep an eye on them for another month.