Bartzella is an Itoh peony, a cross between garden and tree peonies, with big, soft yellow blooms marked by a touch of rose-purple at the heart. The semi-double to double blooms reach 6 to 8 inches across and have a noticeably sweet fragrance.
A mature clump can carry dozens of flowers, spaced neatly over the top and sides of the plant, and some established plants produce 80 or more. The finely cut foliage resembles a tree peony and stays attractive through fall, forming a sturdy 3-foot clump that can stand in for a small shrub. The stems are strong enough that it rarely needs staking.
What it looks like
Large, semi-double to double flowers 6 to 8 inches across have broad, ruffled petals in soft buttery pastel yellow, with a small rose-purple to red flare at the base of the inner petals and a boss of golden stamens partly visible in the center. Blooms are distributed evenly across the crown and outer edges of the plant on sturdy stems. The foliage is deeply divided and lobed like a tree peony, medium to dark green and slightly glossy. The plant forms a dense, rounded, shrub-like clump about 30 to 36 inches tall and wide. At peak bloom dozens of yellow flowers cover the green dome.
Growing it with lavender
Bartzella likes the same sun and good drainage as lavender, and a clump makes a strong anchor at the end of a lavender row, its soft yellow flowers opening just before the lavender and its foliage giving a green backdrop all summer.
Care
Grow in full sun to light part shade in fertile, well-drained soil, with the crown set about 1.5 to 2 inches below the soil surface. Hardy in zones 4-9 and drought tolerant once established. Cut the stems back to a few inches in late fall, and avoid moving an established clump.
At a glance
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Botanical name: Paeonia
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Flower color: Pastel yellow with a rose-purple center flare
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Foliage: Medium to dark green
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Growth habit: Dense, rounded shrub-like clump
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Mature size: 30–36 in tall × 30–36 in wide
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USDA hardiness zones: 4–9
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Light: full sun, part sun to part shade
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Bloom start: Late-May
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Peak bloom: Early-June
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Bloom pattern: Single Flush
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Deer resistance: Resistant
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Pollinator value: Good
Sizes and shipping
Dormant bare-root plant, sold in boxes of 25 per variety (order in multiples of 25). Bare-root plants ship or are picked up March 1–May 31 only. They are soil-free, so they may ship to every state in that window. Dormant plants often show little or no top growth on arrival; plant or heel them in promptly.