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Firefly Diamond Yarrow
Achillea millefolium 'Firefly Diamond'
Firefly Diamond Yarrow is the kind of perennial that makes a sunny border feel easier and more polished. The white flowers work with almost any color scheme, and the plant brings that tough yarrow personality gardeners appreciate—pollinators love it, deer usually leave it alone, and it handles dry weather once established. I like it in drifts with salvia, catmint, coneflowers, and ornamental grasses, where the white flower heads can brighten the whole planting.
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White Yarrow Flowers for Sunny, Low-Maintenance Gardens
Clean White Blooms for Summer Borders.
Firefly Diamond Yarrow is a white-flowering Achillea grown for its bright summer bloom clusters, fernlike foliage, and easy-care performance in sunny gardens. The flat flower heads create a clean, fresh look that works beautifully with colorful perennials, ornamental grasses, and meadow-style plantings. Use it when you want a long-lasting white flower that adds contrast without overpowering the garden.
A Pollinator-Friendly Perennial with Cottage Garden Charm.
The open flower clusters attract bees, butterflies, and other beneficial insects, making Firefly Diamond Yarrow a useful addition to pollinator gardens. Its airy foliage and horizontal flower shape pair well with upright spikes, rounded flower heads, and fine-textured grasses. Plant it with salvia, catmint, coneflowers, coreopsis, lavender, black-eyed Susans, bee balm, and ornamental grasses for an easy summer combination.
Drought-tolerant and deer-resistant once established.
Firefly Diamond Yarrow is a strong choice for sunny landscapes where heat, deer browsing, and dry conditions are common concerns. Once established, yarrow tolerates drought and poor soil better than many traditional perennials. It is also generally deer resistant, making it useful in open borders, roadside-style plantings, and low-maintenance gardens where browsing pressure may be a problem.
Excellent for Cut Flowers and Dried Arrangements.
Yarrow flowers hold well in fresh arrangements and can also be dried for long-lasting indoor use. The white blooms add a soft, classic touch to cut-flower gardens and cottage-style bouquets. Leave some flowers standing later in the season for texture, or deadhead regularly to encourage a tidier plant and a longer bloom display.
Best in Full Sun and Well-Drained Soil.
Plant Firefly Diamond Yarrow in full sun with well-drained soil. Avoid heavy, wet soil, overwatering, and high fertility, which can lead to floppy growth. This perennial performs best when kept on the leaner, drier side after establishment. Light trimming after the first bloom can encourage compact growth and may help produce additional flowers later in the season.
| Hardiness Zone: | 3-9 |
|---|---|
| Mature Height: | 18 to 28 Inches |
| Mature Width: | 24 to 36 Inches |
| Sunlight: | Full sun |
| Soil | Average to poor, well-drained soil; avoid wet or overly rich soil |
| Water | Low to average once established; water regularly during establishment |
| Bloom Time / Color | Summer; white flower clusters |
| Ornamental Features | White flat-topped flowers, fine foliage, long summer bloom, meadow texture, cut flower value |
| Wildlife Value | Attracts butterflies, bees, hoverflies, and beneficial pollinators |
| Resistance | Deer resistant, drought tolerant once established, low maintenance |
| Landscape Uses | Sunny borders, pollinator gardens, cottage gardens, meadow plantings, cut flower gardens, xeriscapes, mass plantings, foundation beds, roadside-style plantings |
How to Care for Firefly Diamond Yarrow
Be sure to read our planting instructions to ensure a healthy and happy Firefly Diamond Yarrow for years to come!
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How should I plant Firefly Diamond Yarrow?
Plant Firefly Diamond Yarrow in full sun where the soil drains well. Yarrow performs best in average to lean soil and does not need rich, heavily amended planting areas. Avoid low, soggy sites because wet soil can cause weak growth, root problems, or winter decline. Dig a hole about twice as wide as the root ball and no deeper than the container. Set the crown level with the surrounding soil, backfill gently, and water thoroughly. Add a light mulch layer if needed to reduce weeds, but avoid heavy mulch directly against the crown.
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How often should I water Firefly Diamond Yarrow after planting?
Water Firefly Diamond Yarrow deeply after planting and keep the soil lightly moist while roots establish. During the first growing season, water when the top few inches of soil become dry, especially during hot or windy weather. Once established, Firefly Diamond Yarrow is drought-tolerant and usually needs little supplemental water. Avoid frequent shallow watering or constantly wet soil. Deep, occasional watering during extended dry periods is better than keeping the soil continually damp.
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When should I fertilize Firefly Diamond Yarrow?
Firefly Diamond Yarrow usually needs little to no fertilizer in average garden soil. If growth is weak, apply a light amount of compost or a low-rate balanced slow-release fertilizer in spring. Avoid heavy feeding. Too much fertility can make yarrow grow tall, soft, and floppy, with fewer strong flowering stems. Full sun, good drainage, and lean soil are more important than rich fertilizer.
When and how should I prune Oertel’s Rose Yarrow?
Deadhead spent flowers to keep Firefly Diamond Yarrow tidy and encourage additional bloom. After the first main flush of flowers, lightly shear the plant back if it becomes open, tired, or floppy. This helps encourage compact growth and may support another round of flowers. At the end of the season, cut the plant back after frost or leave dried flower heads standing for winter texture. In early spring, remove any remaining old stems before new growth begins. Divide mature clumps every few years if the center thins or flowering declines.
