Blue Boa agastache
Blue Boa agastache is a perennial flower for USDA zones 5a-9a. It grows best in full sun and loam and sandy soils.
Is it right for your garden?
Blue Boa agastache is a perennial worth considering when its bloom season, foliage, and maintenance needs fit the bed. The ZIP match is the starting point; final success depends on light, drainage, spacing, and how the plant behaves in your region.
Best fit
- Zones 5a through 9a with full sun and well-drained loam or sandy soil.
- Mixed perennial borders where bloom time and foliage texture have a defined role.
- Gardeners who can divide, cut back, or thin plants as clumps mature.
Use caution
- Perennials are not maintenance-free; many need division, deadheading, staking, or seasonal cleanup.
- Crowding increases mildew, leaf spot, and weak flowering.
- Some attractive cultivars are short-lived unless drainage and winter crown conditions are right.
Regional notes
- In humid ZIPs, prioritize spacing and air movement.
- In hot, dry ZIPs, establish roots before expecting low-water performance.
- Use mulch lightly around crowns and avoid burying perennial growth points.
Comparison note: Compared with a one-season bedding plant, Blue Boa agastache is useful when it earns its space through bloom timing, pollinator value, foliage, or repeated garden performance. Compare it with plants that cover a different part of the season.
Planting and care
Getting started
- Planting depth: Set the crown at the same level it grew in the nursery pot.
- Container minimum: 2+ gal (good). Use 2+ gal per plant, or wider mixed containers with similar water needs.
- Start with one plant when testing fit in a new bed or container.
What to watch
- Deer pressure: Not rated. No deer-resistance category is assigned yet; treat browsing risk as local and variable.
- Black walnut: Mixed or uncertain. Use as a black walnut / juglone planning cue; tolerance varies by cultivar, soil, and distance from the tree.
- Match the site first: full light, loam, sandy soil, and low water.
- Use 1-3 ft apart as the first spacing model; adjust for hedges, trellises, containers, or local guidance.
- Plan around mature size: 1-4 ft H x 1-3 ft W.
- Plan pollination or companion context before planting; nearby varieties can matter for fruit set.
- Local drainage, pests, chill hours, wildlife pressure, and microclimates can change the result.
Photos
Garden use
Blue Boa is an ornamental agastache with large, deep violet-blue flower spikes and licorice-scented foliage, a robust, long-blooming pollinator plant.
When to pick
- Fresh
- Cut flower spikes in bloom for the vase; harvest a few aromatic leaves for tea.
- Preserve
- Dry leaves and flowers.
- Ferment
- The aromatic leaves can flavor infusions.
Ways to use the harvest
Pollinator and hummingbird plant
The main reason to grow it; nectar-rich flower spikes bloom for months.
Cut flowers
Long-lasting fresh or dried in arrangements.
Fresh or dried in arrangements.
Aromatic, deer-resistant foliage
Fragrant when brushed and rarely browsed.
Edible flowers and tea
The flowers are edible and the aromatic leaves can make a light tea.
Ornamental borders
A long-blooming perennial anchor.
Drying
Dry leaves and flowers for tea or potpourri.
Deadheading
Cut back spent spikes to prolong bloom.
Edible flowers
A colorful garnish for salads and desserts.
Light tea
From the aromatic leaves.
Note
bred mainly as ornamental hummingbird mints.
Fermentation
These aromatic agastache can lightly flavor kombucha or an herbal mead.
- Estimated sugar
- They are grown mainly as ornamental hummingbird mints.Use a refractometer or hydrometer if sugar level matters for wine, mead, or other fermentation planning.
- Acidity
- Used as a flavoring rather than fermented.
Nutrition
These agastache are grown ornamentally; their edible flowers and aromatic leaves are used in small amounts for garnish and tea.
Food safety
These agastache (hummingbird mints) are non-toxic; their flowers are edible and the aromatic leaves make a light tea. They are bred primarily as ornamental pollinator plants.
Spacing and growing details
Spacing
Plant Blue Boa agastache at 1-3 ft apart. Adjust this starting point for trellises, hedges, rootstock, containers, pruning style, or local extension guidance.
Growing conditions
Grow Blue Boa agastache in USDA zones 5a-9a with full light, loam, sandy soil, and low water. Use 1-3 ft apart for layout planning. Match the plant to drainage, heat, chill, and pest pressure before scaling up.
Growing in a container
Blue Boa agastache can start with a container of about 2+ gal (good). Larger containers usually buffer heat and moisture swings better than the minimum.
- Full output
- 2-3 yrs
- Planting depth
- Set the crown at the same level it grew in the nursery pot.
- Productive life
- 3-10 yrs
- Difficulty
- 2/5
- Reliability
- 4/5
- Data quality
- Medium
Comparable plants
Plant sources and supplies
Useful supplies
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Right-size container with drainage
Containers / Before plantingUse a container large enough for mature roots, with open drainage holes to prevent root rot.
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Expanding container potting mix
Containers / Before plantingUse a lighter container medium instead of dense garden soil in pots and grow bags.
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Organic mulch
Soil / After plantingHold soil moisture, suppress weeds, moderate soil temperature, and protect shallow roots.
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Hand trowel
Tools / Planting dayPlant starts, herbs, flowers, bulbs, and smaller container plants at the right depth.
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Finished compost
Soil / Bed prepImprove bed structure and organic matter before planting annuals, perennials, shrubs, and trees.
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Watering wand or can
Watering / Planting dayWater new transplants gently without washing soil away from the crown or roots.
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Rabbit or deer protection
Protection / After plantingGuard young edible, native, and ornamental plants until they can tolerate browsing.
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Bypass pruners
Maintenance / First seasonMake clean cuts for harvesting, deadheading, shaping, and light pruning.
Sources and methodology
This guide combines hardiness range, light, soil, water, harvest timing, traits, supplier links, plant relationships, and quantitative planning metrics. Pairings are screened for practical garden fit.
Quantitative values use extension and botanical-reference ranges where available. For less-studied cultivars, similar crops fill gaps conservatively. Ranges are intentionally broad so the profile stays useful without pretending to be exact.
Planning sources: NC State Extension Gardener Plant ToolboxMissouri Botanical Garden Plant FinderK-State Extension Master Gardener Handbook - Herbaceous PlantsUniversity of Maryland Extension - Types of Containers for Growing VegetablesIllinois Extension - Growing Vegetables in Containers
Editorial sources: NC State Extension Gardener Plant ToolboxMissouri Botanical Garden: Plant FinderUniversity of Minnesota Extension: Yard and Garden
Use & preservation sources: University of Wisconsin Horticulture: Anise Hyssop (Agastache foeniculum)National Center for Home Food PreservationUSDA FoodData Central
Supplier search: Amazon. Search links are not paid placements unless explicitly marked; affiliate listings may earn a commission. Last reviewed: 2026-05-31.