Bartzella Peony

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Giant Golden Blooms on a Peony Built for Minnesota Winters Bartzella Peony (Paeonia 'Bartzella') is the award-winning Itoh (intersectional) peony prized for its enormous 6–8 inch, lemon-scented golden flowers flushed scarlet at the heart. It combines the huge blooms of a tree peony with the iron hardiness and tidy habit of a garden peony — and its strong stems never need staking. Whether you're anchoring a sunny border in Wayzata, creating a showpiece bed in Edina, or adding a long-lived specimen in Maple Grove — Bartzella is a standout for zone 4b–5a yards. Bartzella Peony Plant Details Attribute Detail Scientific Name Paeonia 'Bartzella' (Itoh / intersectional) Common Names Itoh Peony, Intersectional Peony Mature Height 30–36 inches Mature Width 36–48 inches Growth Rate Moderate — builds into a fuller, more floriferous bush each year Sun Full sun (6+ hours). Tolerates light afternoon shade; full sun gives the most blooms. Water Average. Consistent moisture in year one; established plants tolerate normal rainfall. USDA Zones 4–9 (Twin Cities is zone 4b–5a) Soil Tolerates Minnesota clay-loam. Prefers deep, well-draining, organic-rich soil — amend with compost at planting. Foliage Deciduous — glossy dark-green, deeply cut leaves stay handsome all season; dies back for winter. Winter Hardiness Reliable to -30°F or colder. Extreme winter hardiness, like herbaceous peonies. Deer Resistance Deer-resistant — peonies are rarely browsed. Bloom Huge 6–8 inch semi-double to double golden-yellow flowers flushed scarlet, fragrant, late spring to early summer over 3–4 weeks. Bartzella Peony Uses in Minnesota Landscapes Specimen and focal-point planting A mature Bartzella carries 30–60 dinner-plate blooms and makes a true showpiece. Give it room as a standalone focal point in a sunny bed, spacing 3–4 feet from neighbors so its bush can fill out. Mixed perennial borders The glossy foliage stays attractive long after bloom, so Bartzella anchors the middle of a border all season. Pair with later-blooming perennials to carry color after the peony finishes. Cut-flower gardens The fragrant golden blooms are spectacular and long-lasting in a vase. Cut in the soft-bud stage early in the morning for the longest vase life. Best Time to Plant Bartzella Peony in Minnesota Fall (late August–early October) is the ideal planting window — and the traditional time for peonies. Soil is still warm for root development, cool air reduces transplant stress, and the plant gets 6–8 weeks to establish roots before ground freeze (typically mid-November in the Twin Cities). Spring (late April–May) is the second-best window. Spring-planted peonies may take an extra season to hit full bloom, which is normal. Avoid summer planting (June–August) when possible. Never plant after mid-October or before late April — frozen ground or frost-heaving kills new roots. How to Plant Bartzella Peony Dig a wide, deep hole — at least 2 feet across — in a sunny, well-drained spot. Peonies dislike being moved, so choose the location carefully. Plant at the right depth. Set the crown so the buds (eyes) sit no more than 1–2 inches below the soil surface — planting too deep is the #1 cause of a peony that won't bloom. Backfill with native soil plus 20–30% compost; firm gently and water in well. Space 3–4 feet from other plants to allow the mature bush to fill out. Build a shallow water basin the first season, then flatten it before winter. Mulch 2 inches with shredded bark the first winter only, kept off the crown, then pull it back in spring so the eyes aren't buried. Watering Bartzella Peony in Minnesota First Year Watering Schedule Weeks 1–2: Every 2–3 days, deep and slow (20–30 minutes) Month 1–2: Every 4–5 days Month 3–6: Every 5–7 days during active growth; less if rainfall is adequate Stop watering 2–3 weeks before ground freeze (typically late October in the Twin Cities metro). After Year One Established peonies are tough and need supplemental water only during extended droughts. Water deeply and infrequently, soaking the root zone. Let natural rainfall do most of the work. Will Bartzella survive a Minnesota winter? Absolutely — Itoh peonies inherit the extreme cold-hardiness of herbaceous peonies and are reliable well below Twin Cities winter lows. Unlike tree peonies, the stems die back to the ground each fall, so there's nothing to protect once established. Why isn't my peony blooming? The most common reason is planting too deep. The eyes should sit just 1–2 inches below the surface. Newly planted peonies also often skip a year or two before hitting full bloom — patience pays off. Is it deer-resistant? Yes. Deer almost always pass over peonies, making Bartzella a dependable showpiece even in high-pressure suburbs like Minnetonka and Eden Prairie. Do Itoh peonies need staking? No. Bartzella's strong, woody-based stems hold the big blooms upright without staking — a major advantage over many floppy herbaceous peonies. You May Also Like Shop the full Three Timbers Minnesota catalog — zone 4-hardy plants hand-selected for Twin Cities yards Deer-Resistant Plants — for high-pressure suburbs like Minnetonka, Wayzata, and Eden Prairie Full Sun Plants — for bright borders and specimen plantings How Many Bartzella Peony Do I Need? Bartzella is a showpiece specimen — give each plant 3–4 feet of room to build its full bush. One plant makes a striking focal point; for a longer border statement, plant a row at 4-foot spacing: Border Run Plants Needed (≈4 ft apart) 10 ft 3 plants 20 ft 5 plants 30 ft 8 plants 40 ft 11 plants For a luxurious effect, plant in groups of 3, each set 3–4 feet apart. Bartzella Peony Season-by-Season in Minnesota Spring: Red-tinged shoots push up and unfurl into glossy, deeply cut dark-green foliage. Summer: Huge 6–8 inch golden flowers flushed scarlet open in late spring to early summer over 3–4 weeks; handsome foliage carries the bed after bloom. Fall: The foliage takes on subtle tints before the stems die back for winter. Winter: Stems die to the ground — no winter structure and nothing to protect once established. At a Glance ✔ Pollinator-Friendly ✔ Deer-Resistant Plant It With Aurora Blue Delphinium — the timeless early-summer partner, its blue spires set against the golden blooms. Amethyst Dream Cornflower — frilly amethyst flowers for a cottage-garden companion at bloom time. Karl Foerster Feather Reed Grass — upright plumes that contrast the mounded peony and carry the bed into winter. Sombrero Granada Gold Coneflower — picks up the gold and carries color long after the peony finishes. Is Bartzella Peony Right for Your Yard? Bartzella thrives in full sun and deep, rich, well-drained soil with room to spread 3–4 feet, rewarding you with dozens of fragrant golden blooms and deer-proof reliability. It's not a fit for deep shade or cramped beds — and remember to set the eyes just 1–2 inches deep, since planting too deep is the top reason a peony won't bloom. Show more