There’s something quietly extraordinary about watching a Rockii tree peony open for the first time — those silky, lavender-flushed petals unfurling like gathered fabric, carrying a soft fragrance that drifts across the garden on a still spring morning.
Lavender Silk (Lan Zhou Chou) arrives as a dormant bareroot plant, 2–3 years old with 2–3 established branches. She ships at 10–25 inches and grows to around 3 feet tall in her first spring flush. Plant her in fertile, well-drained soil with a neutral to slightly alkaline pH, where she’ll receive partial shade and moderate, even moisture during establishment. Her blooms reach an impressive 6.3 inches across. Hardy in USDA zones 4–9, she’s remarkably cold-tolerant — simply mulch lightly in colder climates and ensure soil never stays waterlogged through winter.
Rockii tree peonies are among the most sought-after flowering shrubs for Pacific Northwest gardens, prized for their refined blooms and long-lived, low-maintenance character.
Fall shipping (September–November) is the only window for bareroot peonies — cold stratification is exactly what sets her up for a confident, beautiful first bloom.
🍂 Shipping & planting window
Peonies ship in fall (September–November) when fully dormant and bare root.
Fall planting gives roots a full season to establish in warm soil before winter. Cold stratification triggers strong, healthy spring growth and reliable bloom production. Spring-shipped peonies experience root damage during active growth, transplant shock during their bloom cycle, and often lose an entire growing season.
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