If you’ve ever planted an Agastache only to watch it flop, fade, or fail to attract a single hummingbird, you know the frustration of a variety that simply doesn’t perform. The Black Adder Agastache, with its dense, dark violet-blue spikes and compact habit, was bred to solve exactly those problems — offering a sturdy, long-blooming perennial that actually earns its keep in the border.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I spend my time comparing propagation specifications, studying bloom-period data, and analyzing aggregated owner feedback to separate the true garden performers from the overhyped plugs.
This guide evaluates five top-tier options for your garden, focusing on bloom density, fragrance, pollinator appeal, and winter hardiness to help you choose the right black adder agastache plant for your specific growing zone and design needs.
How To Choose The Best Black Adder Agastache Plant
Agastache, often called hummingbird mint or hyssop, is a sun-loving perennial prized for its aromatic foliage and towering flower spikes. The Black Adder variety stands out for its deep violet-blue color and a compact, non-flopping growth habit. Before you buy, focus on four key factors.
Mature Height and Spike Density
Standard Agastache varieties can reach 36 inches, while dwarf cultivars like the Kudos series top out near 24 inches. Black Adder typically grows 24 to 30 inches tall. Shorter plants work better for front borders and containers, while taller types anchor mid-border spaces. Spike density — how many florets pack each vertical inch — directly controls the visual punch from July through September.
Hardiness Zone and Overwintering
Most Agastache is perennial in USDA Zones 5 through 9. Black Adder is reliably hardy to Zone 5 if planted in well-drained soil and given a light winter mulch. Check your zone before ordering, and avoid plants shipped during dormant season (November through March) if you live in a colder region, as the rootball may not establish before frost.
Fragrance and Pollinator Value
The anise-like scent of Agastache foliage is a signature feature. Black Adder produces a strong, pleasant aroma that drives hummingbirds and butterflies into a feeding frenzy. If you want maximum pollinator traffic in your garden, prioritize varieties with documented fragrance intensity and dense inflorescences that give insects a stable landing platform.
Soil and Drainage Requirements
Agastache despises wet feet. Heavy clay soil that stays soggy after rain will rot the crown within weeks. You need gritty, sandy, or amended loam that drains rapidly. If your garden has heavy soil, consider planting Black Adder in a raised bed or a deep container with drainage holes and a perlite-heavy potting mix.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Perennial Farm Agastache x ‘Blue Fortune’ | Premium | Tall mid-border anchor | Height 36 Inches | Amazon |
| Perennial Farm Agastache x Kudos ‘Yellow’ | Mid-Range | Dwarf color accent | Height 24 Inches | Amazon |
| Florida Foliage Getty White | Mid-Range | White bloom contrast | Drought Tolerant | Amazon |
| Florida Foliage Lily of The Nile | Budget | Group groundcover | Deep Blue Clusters | Amazon |
| Smoke Camp Crafts Cascade Hops | Budget | Edible vine project | Organic Certified | Amazon |
In‑Depth Reviews
1. Perennial Farm Marketplace Agastache x ‘Blue Fortune’
The ‘Blue Fortune’ hybrid is the closest direct relative to a true Black Adder Agastache on this list, producing deep violet-blue flower spikes that stand 36 inches tall — making it the premier choice for gardeners who want a commanding mid-border presence. Its bloom window stretches from July through September, offering three full months of color when the plant is established in average to dry, well-drained soil.
Packaging from Perennial Farm Marketplace has drawn consistent praise: the #1 container arrives with moist soil, the root system intact, and the stems protected by oversized boxes and careful wrapping. Multiple verified buyers reported plants that matched or exceeded local nursery quality, with no transplant shock after hardening off over three to four days.
The fragrant green foliage is described as compact yet bushy, and the plant is highly deer resistant — a major advantage in suburban gardens where browsing pressure limits perennial selection. A few buyers noted that the plant size in spring shipments can be smaller than expected, but the vigorous growth rate and flowering performance in the first season typically justify the price.
What works
- Long bloom period July to September
- Excellent packaging with moist soil retention
- Highly deer resistant foliage
- Strong violet-blue color saturation
What doesn’t
- Early spring plants can arrive on the smaller side
- Restricted shipping to several western states
2. Perennial Farm Marketplace Agastache x Kudos ‘Yellow’
If your garden needs a front border plant that stays under 24 inches without losing the dramatic inflorescence that defines Agastache, the Kudos ‘Yellow’ is your best pick. This dwarf variety produces dense, gold-yellow flower spikes that contrast beautifully against the gray-green foliage, and it carries the same mildew resistance and butterfly appeal as its taller relatives.
Buyers consistently describe these plants as arriving lush, fragrant, and ready to plant immediately. One reviewer highlighted that the plant “softens the transition” between orange coneflowers and red torch lilies — a precise design role that only a compact, non-flopping perennial can fill. The fragrance from the foliage is strong enough to notice when you brush past it on the way to the garden path.
Winter hardiness is the main variable here: a small number of buyers in colder zones reported that the young plugs did not survive their first winter, even when the plants were theoretically rated for their zone. If you live in Zone 5 or colder, plant the Kudos series in a protected microclimate and apply a light winter mulch after the ground freezes.
What works
- Compact 24-inch height ideal for front borders
- Strong mildew resistance in the Kudos series
- Fragrant foliage and dense flower spikes
What doesn’t
- Young plugs may struggle in Zone 5 winters
- Restricted shipping to several western states
3. Florida Foliage Agapanthus Africanus Getty White
The Getty White Agapanthus is not an Agastache, but it serves a complementary role: its pure white, globe-shaped flower clusters bloom in summer and provide a high-contrast foil to the violet-blue spikes of Black Adder. This variety is classified as an evergreen perennial in warm zones and a deciduous perennial in colder regions, making it a versatile companion plant for mass plantings or container groupings.
Buyers report that the three live plants arrive with well-developed root systems and healthy green foliage. The packaging uses a spray-foam base that keeps the pots secure during transit, and multiple customers noted that all three plants survived the shipping process even during high summer heat. The drought tolerance is a real asset — once established, this Agapanthus needs infrequent watering, which reduces maintenance during dry spells.
The most common criticism is plant size on arrival: several buyers described the plants as “very small” and noted that it would take several seasons before blooms appear. If you want instant floral impact, you may need to level up to larger container sizes from a local nursery. But for the price per plant, the root quality and survival rate make this a solid long-term investment for patient gardeners.
What works
- Excellent drought tolerance after establishment
- Strong root system development in pots
- White blooms contrast well with dark Agastache spikes
What doesn’t
- Plants arrive small — blooms may take multiple seasons
- Not a true Agastache, so no anise fragrance
4. Florida Foliage Agapanthus Africanus ‘Lily of The Nile’
This listing offers three live Agapanthus Africanus plants with deep blue flower clusters atop evergreen foliage — a classic groundcover option for Southern gardens or container plantings in cooler zones. The plants adapt well to full sun or partial shade and tolerate sandy soil, making them a flexible choice for gardeners who struggle with heavy clay.
Packaging is a standout feature: buyers report that the plants arrive in a glued wood base with spray foam securing the pots, and the soil stays moist throughout transit. One buyer who ordered 40 plants reported a 100% survival rate after repotting and splitting. The hummingbirds in several gardens were observed visiting these blue clusters regularly, which adds to the pollinator value.
The biggest risk is variability in bloom performance. Several buyers noted that the plants grew slowly and remained small, with no blooms in the first season. A few reported that the bulbs did not emerge at all, though factors like voles and extreme cold may have contributed. If you want guaranteed first-year flowering, this is not the safest bet — but for building a drift of blue groundcover over multiple seasons, the value is hard to beat.
What works
- Excellent packaging — foam base keeps plants secure
- Attracts hummingbirds to blue flower clusters
- Tolerates partial shade and sandy soil
What doesn’t
- Slow initial growth; blooms may not appear first season
- Small starter size can disappoint early expectations
5. Smoke Camp Crafts Cascade Hops Plant
The Cascade Hops plant is not an Agastache — it is a perennial climbing vine grown for its aromatic cones used in beer making and tea. But for the adventurous gardener who wants to add a vertical, edible element to the same well-drained, full-sun bed, this organic-certified plant offers a completely different texture and function alongside your Agastache spikes.
Buyers report that the 2.5-inch pot arrives with visible leaves and a healthy stem, not just a bare root. After one year, vigorous growth produces long runners and actual hop cones — a satisfying harvest for homebrewers. The plant is hardy and returns each season, with one reviewer noting that they “couldn’t kill them” after neglecting them in a tough spot. The organic certification ensures no synthetic pesticides, which is important if you plan to use the hops for brewing.
The main risk is that the plant can arrive as a “scrawny twig” in some cases — a small percentage of buyers received a weak plant that did not survive. This variability is common with live plant shipping, and the seller’s support response is not detailed in reviews. If you order in spring rather than late summer, and plant immediately in well-prepared soil, your odds of success increase significantly.
What works
- Organic certified — no synthetic pesticides
- Vigorous growth after first year; produces cones
- Perennial vine ideal for trellis or fence
What doesn’t
- Some plants arrive weak and do not survive
- Not an Agastache — different care needs and growth habit
Hardware & Specs Guide
Mature Height
The standard Black Adder Agastache reaches 24 to 30 inches at full maturity, though the related ‘Blue Fortune’ hybrid can push to 36 inches in optimal conditions. Dwarf cultivars like the Kudos series top out near 24 inches, making them more suitable for front borders or container plantings. Always check the expected height of the specific variety you order — a plant listed at 36 inches will overwhelm a small container but anchor a mid-border beautifully.
Bloom Time and Duration
Most Agastache varieties bloom continuously from mid-summer (July) through early fall (September), provided they are grown in full sun with moderate watering. Deadheading spent spikes encourages reblooming, though many modern hybrids like ‘Blue Fortune’ are self-cleaning and will continue producing new florets without manual intervention. The bloom duration directly correlates with spike density — look for varieties with multiple side branches on each main spike.
FAQ
How do I overwinter Black Adder Agastache in Zone 5?
Can Black Adder Agastache grow in partial shade?
How far apart should I space Agastache plants?
Final Thoughts: The Verdict
For most gardeners, the black adder agastache plant winner is the Perennial Farm Marketplace Agastache x ‘Blue Fortune’ because it delivers the classic violet-blue spike color, a 36-inch height that anchors the mid-border, and consistent performance across Zones 5–9. If you want a dwarf option for front-border color accent, the Kudos ‘Yellow’ offers compact 24-inch height with mildew resistance and pollinator appeal. And for adding white bloom contrast to your Agastache grouping, the Getty White Agapanthus provides drought tolerance and evergreen foliage that complements the violet-blue spikes beautifully.