Agastache Seeds, Sunset Yellow
Sunset Yellow Agastache blooming prolifically in a greenhouse at Baker Creek.
Sunset Yellow Agastache flowers in a bowl with a stem to the side on a white background.
Sunset Yellow Agastache flowers and stems arranged on white background.
Sunset Yellow Agastache in a small vase with agastache tea on a white background.
Agastache Seeds, Sunset Yellow
Sunset Yellow Agastache blooming prolifically in a greenhouse at Baker Creek.
Sunset Yellow Agastache flowers in a bowl with a stem to the side on a white background.
Sunset Yellow Agastache flowers and stems arranged on white background.
Sunset Yellow Agastache in a small vase with agastache tea on a white background.

Agastache Seeds,
Sunset Yellow

41 ReviewSKU: #HB320Min. seed count: 35
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Description

(Agastache aurantiaca). Perennial in zones 6-10, otherwise grown as an annual. Colorful and fragrant blooms create an intoxicating haze of sunrise yellow in the garden. Plants reach 10 to 12 inches tall, and about the same width. The small, tubular blooms appear in summer and persist until well into the fall, all the while attracting droves of pollinators, including butterflies and hummingbirds.

Growing Tips: Sunset Yellow is a cheerful, compact agastache that brings an unusual warm yellow color to the garden—a striking departure from the typical blue, purple, and orange tones of the agastache palette. Its small, tubular blooms are produced in abundance from summer well into fall, creating a long-lasting display that draws butterflies, hummingbirds, and other pollinators in impressive numbers. Its tidy, symmetrical habit makes it equally well suited to containers, front-of-border plantings, and pollinator gardens.

Plant Details

Botanical Name
Agastache aurantiaca
Life Cycle
Perennial
Sun Requirement
Full sun
Days to Germinate
14–21
Days to Maturity
90–100
Planting Depth
Surface sow
Plant Spacing
12 in.
Ideal Temperature
60–90°F
Frost Hardy
Yes

When to Grow

Start seeds indoors 8 to 10 weeks before the last expected frost date for first-year bloom, or direct sow outdoors in early spring once soil can be worked. Seeds require light to germinate and should be surface sown without covering. A brief cold stratification period of two to four weeks may improve germination rates. In Zones 6–10 established plants are reliably 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. Sunset Yellow performs best in lean, well-drained soils consistent with its Southwest native heritage—avoid heavy clay or poorly drained conditions. Space transplants or thin seedlings to 10 to 12 inches apart to suit the plant's compact, symmetrical mature habit. For container growing, use a well-draining potting mix and ensure pots have adequate drainage holes, as sitting moisture is the most common cause of decline. 

How to Grow

Sunset Yellow is drought-tolerant and low-maintenance once established. Water regularly during the first season to support strong root development, then reduce irrigation significantly as plants mature. In containers, water consistently but allow the growing medium to dry somewhat between waterings. Deadhead spent flower spikes regularly to sustain blooming from summer well into fall, and cut plants back to the ground in early spring before new growth emerges. In colder zones, start fresh plants each spring for reliable annual performance.

How to Save Seeds

Sunset Yellow 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

How is Sunset Yellow different from other compact agastache varieties like Lavender Martini?

Sunset Yellow offers a rare warm yellow flower color that stands apart from the lavender, raspberry, and orange tones of other compact varieties. Both share a similar size and tidy habit, but the yellow blooms provide a distinct and unusual garden accent.

Can Sunset Yellow agastache be grown successfully as an annual in cold climates?

Yes—in zones colder than Zone 6, treat it as a warm-season annual started fresh from seed each spring. Plants establish and bloom quickly enough to provide a full season of color and pollinator value before frost.

How long does Sunset Yellow bloom, and what pollinators does it attract?

Plants bloom from summer well into fall, providing months of nectar-rich flowers that attract butterflies, hummingbirds, and a wide range of beneficial insects throughout the long flowering season.

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