Anise hyssop 'Snow Spike' brings white flowers to the species Agastache foeniculum, known for its aromatic foliage. This perennial forms stems of 80 to 120 cm (31 to 47 in.), a height that gives it an airy presence in the middle of a flower bed. Its fragrant flowers particularly attract bees and bumblebees; the seed supplier also observes butterflies, hoverflies and hummingbirds. White offers an alternative to the mauve shades more familiar in agastaches. With an indoor start, the plant can flower in its first year, then return when overwintering conditions suit it.

Set it in sun in soil that drains well. The grower's suggested schedule calls for indoor sowing six to ten weeks before the last frost, or direct sowing in June. Place the small seeds on the surface and keep the growing medium moist as they establish, without burying them beneath a layer of potting mix. Allow 30 cm (12 in.) between plants and acclimatize seedlings started indoors before their final move outside. The stated hardiness is zone 4. When choosing a location, therefore prioritize winter drainage as much as summer sunshine.

In a bed, its white flowers connect plantings of different colours without introducing a new dominant shade. Reserve a few stems for insects and pick only what you need for culinary use. The leaves and flowers can be used as a seasoning or made into an herbal tea; their flavour is reminiscent of liquorice with a minty note, with variations between individual plants grown from seed. Carefully identify plants before harvest and use only healthy parts. This agastache can self-sow: watch for young shoots in spring and keep those that find a place in your design.