And all through, bringing an invaluable richness to the pastel coloring, is Agastache ‘Black Adder’ (Zone 6). This hybrid anise hyssop, developed from a native and a Chinese species by another well-known Dutch plantsman, Coen Jansen, transforms the combination with the sultry darkness of its spikes.
There are two reasons this combo works so well. First, the choice of plants: Not only do the colors work together, but all develop attractive seedheads and all thrive in the same conditions—and none of them run at the root.
The other factor is that they’re not planted in the traditional style of one clump of three or five plants of one variety set alongside a clump of another; instead, they’re planted in mingling drifts so that the colors blend one into another.
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