Product description
Agastache Blackadder is a hardy perennial that produces tall spikes of violet-blue flowers from mid-summer into autumn. These blooms rise above toothed green foliage that boasts a spicy, aniseed-like aroma when crushed. Also known as Giant Hyssop, Agastache is great for borders, rockeries, or patio containers and attracts bees, butterflies, and other pollinators, bringing life to your garden with minimal effort.
It’s easy to care for and doesn’t need much attention to thrive. Plant Agastache in full sun with well-drained soil and water regularly until established. Once settled, it’s drought-tolerant and low-maintenance. Deadhead spent flowers to encourage more blooms and cut back in late autumn or early spring to keep it healthy and compact.
Please Note: When purchasing plants, please consider that each live item is unique and may therefore differ from the images shown, which are for illustration purposes only. The plant will be supplied in a growers pot. Depending on season, some plants may be pruned back to encourage growth and deciduous plants may arrive without leaves.
Giant Hyssop
Agastache 'Blackadder'
Agastache 'Blackadder'
Product description
Agastache Blackadder is a hardy perennial that produces tall spikes of violet-blue flowers from mid-summer into autumn. These blooms rise above toothed green foliage that boasts a spicy, aniseed-like aroma when crushed. Also known as Giant Hyssop, Agastache is great for borders, rockeries, or patio containers and attracts bees, butterflies, and other pollinators, bringing life to your garden with minimal effort.
It’s easy to care for and doesn’t need much attention to thrive. Plant Agastache in full sun with well-drained soil and water regularly until established. Once settled, it’s drought-tolerant and low-maintenance. Deadhead spent flowers to encourage more blooms and cut back in late autumn or early spring to keep it healthy and compact.
Please Note: When purchasing plants, please consider that each live item is unique and may therefore differ from the images shown, which are for illustration purposes only. The plant will be supplied in a growers pot. Depending on season, some plants may be pruned back to encourage growth and deciduous plants may arrive without leaves.
Give your plants the best start
Garden Plant Size Guide
Plants in larger pots can be multiple years older than their smaller counterparts with more mature root systems and foliage. This makes them able to thrive as a full size plant in your garden quicker than smaller alternatives.
The most common size of pot that garden plants come in are 9cm/1L/3L/5L this is in reference to the diameter at the top of the pot.
9cm potted plants still remain the most popular cost effective option though, they just may take a little patience to allow them to grow into full maturity once planted in your garden.
Plant specs, care guide & tips
Key features
Specifications
When to plant
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
Planting and period of interest times are general guidelines and may vary based on your location and conditions. For best results, consult local gardening resources.
Instructions
Top Tip
Mulch or use horticultural fleece to protect the plants roots against frost damage in winter.
How to Water
Water regularly, keeping the soil consistently moist between spring and early autumn. Provide water more sparingly outside the growing season.
How to Plant
Choose a sunny sheltered spot and ensure the soil drains freely. Dig a generous hole and position the plant inside, planting with the crown just below the surface. Fill the hole in with soil, gently firming with your foot and water in well.
