General Culture:
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. Taller plants have a tendency to flop in hot, humid southern summers including the St. Louis area, particularly if grown in less than full sun or in overly rich soils. 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 possible additional fall bloom. Divide clumps when they become overcrowded (every 3-4 years). 'Parker's Variety' may be grown from seed and may self-seed in the garden under optimum growing conditions.
Noteworthy Characteristics:
'Parker's Variety' is an upright, clump-forming yarrow which is noted for its deeply-dissected, fern-like, aromatic, grayish-green to green foliage and its tiny, long-lasting, bright golden flowers which appear in dense, flattened, plate-like compound corymbs (to 4" across) throughout the summer on stiff, erect stems typically rising 3-4' tall. Foliage has a strong, somewhat spicy aroma which persists when used in dried arrangements.
Problems: Click for detailed list of pests and problems.
Stem rot, powdery mildew and rust are occasional disease problems. Taller plants usually need staking, particularly if grown in less than full sun. Strong summer rain storms with high winds can devastate exposed plantings.
Uses:
Specimen, group or mass. Borders. Cottage gardens.
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Garden, 2001-2010