Summerlong™ Lilac Agastache

Light Needs

Full Sun

(6+ Hours Direct Sun)

Mature Height

1 Foot

Mature Spread

1 Foot

Growing Zones

7 to 10

Summerlong™ Lilac Agastache (Agastache mexicana 'Balsumlilac') creates a show-stopping display from late spring to summer with upright spikes of lilac-pink blooms. Each trumpet-shaped flower draws hummingbirds and other pollinators, turning your garden into a lively scene of fluttering activity. The compact, mounded habit grows to about 16 to 22 inches, making it a perfect option for tighter spaces or feature plantings. Softly scented foliage offers a gentle fragrance each time you brush by. Its reliable performance and continuous flowering make it an ideal choice for gardeners wanting color that lasts.

This deer-resistant perennial thrives in full sun, enjoying plenty of warmth and moderate to low watering. Native to Mexico, it tolerates heat and periods of drought once established, fitting seamlessly into water-wise gardens. Whether you’re brightening a sunny border or dressing up patio containers, its neat form works well in many planting styles. Summertime pollinators flock to the flowers, so you’ll appreciate both their grace and practical ecological benefits. 

Summerlong™ Lilac Agastache Care

Plant this Agastache where it will receive at least six hours of sunlight per day. Prepare the soil by mixing in organic matter if needed, ensuring good drainage, as wet feet can hinder growth. Water regularly during the first few weeks to encourage deep roots, then shift to a more moderate schedule once the plant establishes. A single annual application of a balanced fertilizer in spring is often enough, since overly fertile conditions can produce lanky growth. Removing spent flower spikes keeps the plant looking clean and encourages more flowers.

When it comes to pruning, a simple trimming after the blooms fade can trigger additional flushes of color. You can also do a light cutback in late winter or early spring to promote fresh stems for the new season. If you choose to grow Summerlong™ Lilac Agastache in containers, make sure to move them into a protected spot if you live in cooler zones where freezes are common. This ensures the roots stay a bit more insulated and lets you enjoy those lovely flowers again next year.

Summerlong™ Lilac Agastache Spacing

Allow about 14 to 16 inches between plants when using them in borders or pollinator gardens, giving the roots room to expand and the foliage space to flourish. If you plan to feature it in a container, choose one that’s at least 10 to 12 inches in diameter to accommodate the plant’s root ball.

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