Astello Indigo Agastache in a white dish on a white background.
Astello Indigo Agastache blooming prolifically in the gardens at Baker Creek.
A close-up of a single Astello Indigo Agastache leaf with tiny blue blooms on a white background.
A hummingbird moth gathers pollen from an Astello Indigo Agastache plant in the garden.
A close-up view of Astello Indigo Agastache stems with flowers and blooms on a white background.
Astello Indigo Agastache in a white dish on a white background.
Astello Indigo Agastache blooming prolifically in the gardens at Baker Creek.
A close-up of a single Astello Indigo Agastache leaf with tiny blue blooms on a white background.
A hummingbird moth gathers pollen from an Astello Indigo Agastache plant in the garden.
A close-up view of Astello Indigo Agastache stems with flowers and blooms on a white background.

Agastache Seeds,
Astello Indigo

SKU: #HB360Min. seed count: 35
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Description

(Agastache hybrida). These irresistible indigo blooms bring soothing, calming colors to the garden while providing an abundant source of nectar for bugs, butterflies, and pollinators from summer through fall. Displaying glorious dark green foliage with a fresh minty fragrance, these vigorous growers reach heights of 20 inches yet remain compact in neat clumps. An edible ornamental beauty, first introduced by Dutch seed outlet Van Hemert and Co, it’s no surprise that the astonishing Astello Indigo claimed the Fleuroselect Gold Medal in 2012.

Growing Tips: Astello Indigo is an award-winning hybrid agastache prized for its deep indigo flower spikes, disease-resistant dark green foliage, and compact, tidy clumping habit. Its long blooming season from summer through fall makes it one of the most reliable sources of late-season nectar for pollinators in the garden. The edible flowers and minty-fragrant foliage can be used to flavor baked goods, beverages, and cream, and dried flower spikes make fragrant, long-lasting additions to potpourri.

Plant Details

Botanical Name
Agastache hybrida
Life Cycle
Perennial
Sun Requirement
Full sun
Days to Germinate
14–30
Days to Maturity
105–112
Planting Depth
Surface sow
Plant Spacing
12–18 in.
Ideal Temperature
70°F
Frost Hardy
Yes

When to Grow

Start seeds indoors 8 to 10 weeks before the last expected frost date for first-year bloom, sowing from late winter through early spring. Seeds require light to germinate and should be surface sown without covering. Maintain warm soil temperatures of 60–68°F during germination for best results. In USDA Hardiness Zones 6–9, established plants are perennial and will return each season; in colder zones, treat as a long-blooming annual started fresh each spring. If you're not sure how to find your first and last frost dates, consult our blog post Our Experts Answer Questions, Share Resources.

How to Sow and Plant

Surface sow seeds by pressing them lightly into moist, well-drained soil without covering. Astello Indigo performs well in average to moderately fertile, well-drained soils and adapts equally well to garden beds, borders, and containers. Space transplants or thin seedlings to 12 to 18 inches apart to accommodate the plant's naturally compact, clumping habit. As with other agastaches, avoid heavy clay or poorly drained soils, which are the primary cause of crown rot and plant loss.

How to Grow

Astello Indigo is drought-tolerant and heat-resistant once established, requiring only moderate watering and minimal fertilization. Allow soil to dry somewhat between waterings and avoid overwatering, particularly in heavier soils. Plants are notably disease-resistant under good growing conditions. Deadhead spent flower spikes regularly to encourage continuous blooming through the season. In Zones 6–9, cut plants back to the ground in early spring before new growth emerges; apply a light protective mulch in winter in the colder end of its hardiness range.

How to Save Seeds

Astello Indigo produces small seeds in clusters along the dried flower spike, typical of the Lamiacae family.

  • Allow a few flower spikes to dry fully on the plant at the end of the season
  • Harvest seed spikes by cutting and placing in a paper bag to capture any that fall
  • Dry thoroughly in a cool, well-ventilated location before cleaning
  • Store cleaned seeds in a sealed, labeled container in a cool, dry, dark place for up to 3 years

FAQ

What award did Astello Indigo win, and why is it significant?

Astello Indigo received the Fleuroselect Gold Medal in 2012, one of the most prestigious awards in the European seed trade, recognizing outstanding new varieties for garden performance and ornamental value.

Are the flowers and foliage of Astello Indigo edible?

Yes—both flowers and leaves are edible and carry a fresh minty-anise flavor. They can be used to flavor baked goods, cold beverages, and whipped cream, or dried for fragrant potpourri.

Can Astello Indigo be grown in containers?

Yes—its compact, clumping habit and moderate height make it well suited to pots and containers. Ensure excellent drainage, water consistently, and fertilize monthly for best performance in container plantings.

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