Moisture retentive soil
Well drained soil
If you want to attract butterflies to your garden Agastache 'Blackadder' should be on your list, they love its rich purple bottlebrush-like flowers.
Bees and butterflies just cannot resist the nectar rich deep violet blue blooms of 'Blue Boa'. They flock to its dense flower spikes that appear from mid summer deep into autumn, only to be stopped..