Agastache 'Blue Boa' | Mexican giant hyssop
Massive deep violet-blue spikes
Grown by Mike's perennial specialists
UK
Choose your size
Out of stock
Currently out of stock
Currently out of stock
Plant diary
- Flower
- Harvest
Agastache 'Blue Boa'
Mexican giant hyssop
- Stand out from the crowd with the spectacularly massive, unbelievably thick, deep violet-blue flower spikes of this outstanding, highly contemporary perennial.
- Agastache 'Blue Boa' produces incredibly vibrant, densely packed blooms that completely overshadow older varieties, making a jaw-dropping statement in the border.
- This agastache is phenomenally floriferous, pumping out a relentless, high-impact display of color from early summer straight through to the autumn.
- It features gorgeously aromatic foliage and thrives in baking sun, making it the absolute perfect, zero-fuss choice for a hot, modern gravel garden.
- You will be absolutely amazed by the sheer volume of wildlife it attracts, turning your outdoor space into a bustling, vibrant haven of activity.
What to expect
Supplied as
Eventual height
Eventual spread
Flower colour
Habit
Hardiness
Will this grow in my garden?
Can I grow this in a pot?
Yes, Agastache 'Blue Boa' grows well in pots with regular watering during dry spells.
How big does it get?
Agastache 'Blue Boa' typically reaches a mature height of 80 cm and a spread of 40 cm.
How much sunlight does this need?
Agastache 'Blue Boa' requires full sun for at least 6 hours a day.
What kind of soil does this plant prefer?
Agastache 'Blue Boa' prefers well-drained, moderately fertile soil.
How much watering does this plant need?
Agastache 'Blue Boa' is drought-tolerant once established, needing water only when the top 5 centimetres of soil feel dry.
Will this plant need pruning?
Agastache 'Blue Boa' | Mexican giant hyssop does not strictly need pruning, but regular deadheading will encourage more flowering. Cut the plant back to the base in late autumn or early spring.
How hardy is this plant?
Agastache 'Blue Boa' is rated H3 or H4, tolerating temperatures down to -5°C to -10°C. It may survive winters in mild southern UK gardens with good drainage, but often requires protection in colder northern areas.
The wider garden
UK
Meet Mike's perennial specialists
Trusted choices lovingly grown
Our perennial plants are raised by several of our most trusted UK growers, with only the very finest plants making the cut to be sent on to our Cotswolds nursery. Your perennials are double (then triple) checked over by our team – this is where being pernickety is a good thing – before being sent to you in the perfect condition for planting. Happy days.
What customers say about us
We do our best to provide you the best experience ever
Learn from our experts
For growing advice that's clear and easy to follow
What customers say about us
We do our best to provide you the best experience ever
Fighting plastic waste
Delivering fresh from the nursery
Supporting UK growers