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Various species and selections  of Achillea  L.  were  grown for 2 to 5 years, depending on taxon, and evaluated for cut flower yield and quality. `Coronation Gold' yarrow (A. × `Coronation Gold') was productive for 5 years. Flower yield, average stem diameter, and stem length were smallest the first year, but no differences occurred between years 2 and 5. The highest percentage of stems &gt; 50 cm long occurred on plants at the densest spacing. Yields were higher and stems longer for  A. millefolium  L. cultivars and  A. ptarmica  L. `The Pearl' in the second than the first year.  A. millefolium  `Kelwayi' and `Lilac Beauty' produced the highest yield while `Heidi' and `Sawa Sawa' produced the longest stems. Yields of all cultivars of Galaxy hybrids (A.  taygetea  Boiss. &amp; Heldr. ×  A. millefolium)  increased over 4 years of harvest. Stems were longer and flower diameters were larger after the 2nd year for all cultivars but `The Beacon'. `Salmon Beauty' had the highest yield, but yield of `Appleblossom' did not increase after year 2.

Field Studies of Achilles as a Cut Flower: Longevity, Spacing, and Cultivar Response