Eucomis Sparkling Burgundy doesn't flower all Summer long. The new foliage emerges in Spring, and is at its deepest colour. It then goes slightly more greeny/burgundy, and the flower stalks appear in mid-Summer, and last for months, although they flop (and are not erect like the photo above). We grow it in pots and in the ground, and would grow it for the foliage alone.
If your troughs are big enough, I would also consider some small specimens of Cotinus. There are also some Geraniums with Burgundy foliage (Black & White, Hocus Pocus), and they are very compact, so fine for a pot/trough.
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If your troughs are big enough, I would also consider some small specimens of Cotinus. There are also some Geraniums with Burgundy foliage (Black & White, Hocus Pocus), and they are very compact, so fine for a pot/trough.