Achillea 'Coronation Gold'
Also known as Yarrow. Best grown in lean, dry to medium moisture, well-drained sandy loams in full sun. Does well in average garden soils and tolerates poor soils as long as drainage is good. Avoid heavy clays and moist, rich, fertile soils. Plants are best sited in locations protected from strong winds. Deadhead spent flower heads to lateral buds to promote additional bloom. Cut plants back to basal leaves after flowering to tidy the planting and to encourage new foliage growth and a possible additional fall bloom. Divide clumps as needed (every 3-4 years) to reinvigorate plantings.
'Coronation Gold' tolerates hot, humid summers and drought, and is considered to be one of the best yarrows for the St. Louis area. Although the tough stems of this hybrid are stiff, they do have a tendency to flop, particularly if grown in less than full sun or in overly rich soils.