Agastache is a lovely plant with upright spikes of tubular flowers and aromatic leaves. Also attractive to bees and butterflies. This herbaceous perennial prefers well-drained soil in a sunny position.
Agastache ‘Blue Fortune’
There are many good varieties. Agastache ‘Blue Fortune’ is a popular Agastache with a bushy habit and slender, lavender-blue spikes from July to October.
Agastache ‘Blue Boa’
For lilac-blue flower heads, you could also try Agastache ‘Blue Boa’. This plant grows about to 1,2m tall.
Smaller in size is Agastache ‘Blackadder’, bearing deep dark flowers and dark green leaves.
Agastache ‘Blue Boa’ Agastache ‘Blue Fortune’
Pruning Agastache (Hyssop). Leave the stems intact over the winter. It will provide a bit of winter protection. Cut the old, brown stems down to the ground in March, as new, fresh growth appears.
Agastache (hyssop) is not fully hardy. Doesn’t like wet feet in the winter months. May suffer dieback in cold or wet winter. Cover the base of the plant with a thick layer of dry winter mulch as a precaution against dieback.