Agastache Growing Guide
Crop Rotation Group
Average garden soil with excellent drainage.
Agastache seedlings can be damaged by spring frost, but established plants may survive winter if the soil does not freeze.
Encourage fast growth by mixing a balanced organic fertiliser into the soil before planting.
The tall, arching flower spikes of agastache contrast beautifully with shorter, mound-forming flowers like alyssum or petunias. Agastache attracts bees and other beneficial insects.
Single Plants: 30cm (11") each way (minimum)
Rows: 30cm (11") with 30cm (11") row gap (minimum)
Sow and Plant
Set out stocky seedlings in late spring. Small agastache plants grow slowly at first, and gain size and bloom in late summer.
Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area.
Agastache tolerates summer drought better than many other flowers. Popular cultivars like ‘Blue Fortune’ are hardy to -15C (5F ) when well established. Some varieties bloom rose-red or orange.
As flower spikes fade, trim them off with secateurs.
Agastache has few pest problems and is seldom eaten by deer. Heavy winter mulching can cause the dormant plants to rot.
Planting and Harvesting Calendar
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