Skysail Yellow Yarrow (Achillea millefolium 'Bosachskyye' SKYSAIL YELLOW)
ah-KILL-lee-ah mil-lih-FOE-lee-um 'Bosachskyye' SKYSAIL YELLOW

Deciduous Perennial Upright, Clump-Forming in the Asteraceae Family
Lemon yellow blooms emerge from orange buds, then slowly fade to shades of butter cream.

'Skysail Yellow' is the trade name for Achillea millefolium 'Bosachskyye', a patented (US Plant Patent 34,831) cross of Achillea millefolium 'Desyel' and 'Surprising Cherry', bred by Adriana Klaasse Bos-Bos and discovered in Zwaanshoek, the Netherlands, in 2016.

Its signature trait is a multi-stage bloom: flower heads open from bright orange buds into lemon-yellow blooms, then fade to buttery cream, often with several stages visible on the plant at once. It forms a compact, upright, clump-forming plant with fern-like green foliage, and like common yarrow generally, it can self-seed and spread by rhizomes if not kept in check.

Pros

  • Multi-stage bloom color — orange buds, lemon-yellow flowers, buttery-cream fade, often all at once
  • Compact, tidy habit; drought- and deer-resistant once established
  • Long summer bloom season, good as a cut flower
  • Tolerant of poor, sandy, and salty soil

Cons

  • Patented — propagation restricted to licensed growers
  • Sources disagree notably on mature size (10-14 in. per most retail listings, up to 18-24 in. per the patent and one grower)
  • Can self-seed and spread if not managed
Highlights Flowers move through three color stages at once — orange buds, lemon-yellow open blooms, and buttery-cream fading flowers — giving a single plant a multicolored look through its long bloom season.
 

Plant Data

Mature Size 10 - 14 inches tall. - 14 inches wide.
Sun Exposure Full Sun - Full Sun
Moisture Tolerance Dry - Medium: Drought-tolerant once established; prefers dry to medium moisture and good drainage.
Zones 3a - 9b (Usually hardy to -40° F)
Tags Attracts Bees, Attracts Beneficial Insects, Attracts Butterflies, Attracts Pollinators, Deciduous, Deer Resistant, Drought Tolerant, Dry, Fall Color, Full Sun, Good for Beginners, Good for Butterfly Garden, Good for Cottage Garden, Good for Mass Planting, Good for Rock Garden, Groundcover, Low Maintenance, Medium, Naturalizing, Normal Soil, Perennial, Rabbit Resistant, Tolerant of Poor Soil, Well-Drained Soil
Bloom Period June to September
Flower Color Orange Buds Opening to Lemon Yellow, Aging to Buttery Cream
Foliage Color Green
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Pricing and Availability History

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Past Availability
2025 : 04/13 - 07/26
2024 : 10/03 - 10/05

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Field-Grown vs. Greenhouse-Grown Plants

Plants which are well-adapted to our local climate are most often field-grown (outside). Field-grown plants are generally cheaper and have the advantage of already somewhat acclimated to our cold winters, but that means they’re not artificially far along in the spring and tend to bloom at the normal time in our area.

Spring annuals and tender perennials are typically grown in Greenhouses so they can be ready and luxurious exactly when customers want them. Some perennials are also “forced” into early bloom in greenhouses. In May, there can be a very big difference between field-grown and greenhouse-grown plants of the same type. The latter typically look good right away (so they’re a great choice where that’s important), but we typically pay a premium for it.


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No Pricing or Availability Right Now

We order from a rotating cast of the best nurseries in the Great Lakes region. It looks like we've offered this plant in the past, but the nurseries we're working with this week don't appear to have it in stock at the moment.

Our goal is to bring as many plants together under "one roof" as possible, so we'll try hard to make it available again in the future!