Agastache BlackadderBlue-black spikes over aromatic leaves. One of the hardiest agastaches. | Flowering period: July to October. | | Growing conditions: Very well-drained soil in sun. | | Typical mature height: 40 inches ( 102 cms ) | | Hardiness: - to discuss further |  | This is an insect-friendly plant which gives bees and other insects easy access to nectar and pollen. | |

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