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Ornamental nursery plant
Paeoniaceae
Ornamental perennial plants
Peony
Paeonia lactiflora
Peony 'Karl Rosenfield'. The large crimson double flowers combine waved outer petals with incurved, notched petals at the centre of each bloom. Give the flowers an open setting where their form can be appreciated without moving neighbouring leaves. The clump can then continue contributing to the border after flowering. Give the flowers a clear visual setting rather than hiding them behind a mass of leaves. Divided foliage can continue contributing to the composition after bloom. Place plant accents where they can be appreciated, then arrange surrounding volumes around them. Repeating one selection can connect different sections of a border, while an individual specimen can provide a visual focal point. Compare foliage textures as carefully as flower colours. Consider the scene before, during and after flowering.
- Exposure
- Full sun
- Life cycle
- Perennial
- Hardiness
- Zone 2–9 (USDA)
Discover the plant
Common namePeony
FamilyPaeoniaceae
GenusPaeonia
Specieslactiflora
CultivarKarl Rosenfield
TypeOrnamental nursery plant
Botanical namePaeonia lactiflora
Peony 'Karl Rosenfield'. The large crimson double flowers combine waved outer petals with incurved, notched petals at the centre of each bloom. Give the flowers an open setting where their form can be appreciated without moving neighbouring leaves. The clump can then continue contributing to the border after flowering. Its botanical name is Paeonia lactiflora 'Karl Rosenfield'. Its foliage shows dark green tones between periods of flowering. The plant reaches 80–90 cm (31.5–35.4 in) in height. Flowering occurs during early summer and late spring; its timing varies with the weather and the stage of plant establishment. Consider the scene before, during and after flowering.
Choose an exposure of full sun for this selection. Prepare fertile ground that releases water after rain. Set the nursery plant into prepared ground without compressing its root ball. Avoid burying the crown of an herbaceous peony too deeply. During establishment, the original root ball can dry out even when surrounding soil looks moist. Fertile soil is the foundation of care. Mulch can reduce weeds and moderate moisture changes, but it does not replace checking the soil. Adapt mulch to the planting site and the genus’s requirements. For a nursery plant already growing in a container, moisten the root ball before removing the pot. Prepare a hole wide enough to accommodate the roots without compressing them.
Grow these plants for ornamental use and retain their identification labels. Give the flowers a clear visual setting rather than hiding them behind a mass of leaves. Divided foliage can continue contributing to the composition after bloom. Open ground suits peonies better than a small pot that remains crowded indefinitely. The flowers attract butterflies. Place plant accents where they can be appreciated, then arrange surrounding volumes around them. Plan the planting around mature spread rather than the small size of the purchased plant. Leave access to reach specimens in the middle of the bed. Choose companions by exposure, moisture, drainage and mature spread, then check those requirements for the particular varieties selected.
Planting guide
From planting to establishment.
Best planting time
Late spring for a container-grown plant; autumn for a bare-root division, before the soil freezes.
Propagation
Division in fall only when necessary
Growing method
For peony planting, prepare the site first and position the nursery root ball with care. Set the nursery plant into prepared ground without compressing its root ball. Avoid burying the crown of an herbaceous peony too deeply. Grafted woody peonies require a different planting depth; identify the plant type and graft before deciding on its final position relative to the soil surface. Choose an exposure of full sun for this selection. For a nursery plant already growing in a container, moisten the root ball before removing the pot. Prepare a hole wide enough to accommodate the roots without compressing them. Return the plant to its previous growing level unless its genus requires a specific adjustment, then settle soil around the root ball. Water to bring roots and soil into contact, and subsequently check moisture within the root ball itself. During establishment, the original root ball can dry out even when surrounding soil looks moist. Check both areas, especially after light rain or windy weather. Water slowly enough for moisture to enter the soil rather than run off its surface. As roots explore the surrounding ground, adjust watering to actual moisture and weather conditions. The watering interval should change with root development instead of following a fixed calendar. Mulch can reduce weeds and moderate moisture changes, but it does not replace checking the soil. Adapt mulch to the planting site and the genus’s requirements. When tidying in spring, locate emerging shoots before moving surrounding material so that small developing stems are not damaged during routine border maintenance.
Soil and care
The right care,at the right time.
Soil pH
Acidic, neutral or alkaline
Care level
Easy
Watering
Plan peony watering around actual root-zone moisture, then reassess after rain or changes in the weather. Water the root ball and surrounding ground while the peony establishes. An established plant requires fewer interventions, but watch dry spells and developing buds. Check moisture before watering again; a constantly sodden crown can deteriorate even when the leaves appear to be asking for additional water. Direct water towards the root zone rather than over flowers and leaves. Avoid repeated small applications to soil that is already wet, and adapt your care to the moisture conditions that suit this plant.
Soil type
Consider peony soil requirements when choosing a site, checking soil structure and drainage before planting. Prepare fertile ground that releases water after rain. Organic matter improves structure, but a hole filled with compost does not correct a saturated planting area. Check how the soil behaves after prolonged rain. A dry-looking surface does not guarantee that roots have enough air below it. Prepare the surrounding root zone rather than filling a small hole with a sharply different material. Choose another planting position if drainage cannot be improved reliably over the long term.
Fertilization
Approach peony fertilization through soil needs and plant growth rather than repeatedly adding products without checking the garden. Fertile soil is the foundation of care. Assess its condition before adding fertilizer and follow the directions for the selected product. Keep additions away from the crown's centre. Excessive feeding cannot correct planting that is too deep or a position that receives too little light. Assess soil fertility before adding fertilizer. Ground that receives organic matter regularly may need less feeding than impoverished soil. Abundant, soft foliage does not necessarily lead to a better floral display or stronger stems in the garden.
Seasonal care
Organize peony seasonal care around the plant, its root zone and the changing conditions of the garden. Remove spent flowers without cutting off leaves that remain active. Support heavy flowers before they lean after rain when needed. At the end of the season, clear dead herbaceous growth. Living branches on a woody peony must stay in place to carry its next season of growth. In spring, locate renewed growth before working close to the crown. Remove debris that obstructs new shoots while respecting the genus’s care requirements. Inspect drainage after snowmelt, and check the crown and roots if growth appears abnormal. Weed carefully: deep cultivation around an established perennial can damage roots that already extend through the bed. Let actual growth and soil conditions guide the timing of maintenance. During summer, observe how foliage responds to heat and check moisture before intervening. Newly planted specimens deserve particular attention. Remove damaged material or faded flowers only when that action suits the genus and the intended result. Retain healthy leaves that are still supporting growth. In autumn, adapt cleanup to plant health and the way the plant grows. Green leaves should not be removed simply because flowering has ended. Diseased foliage needs different handling from healthy stems retained for their silhouette. Mark crowns before above-ground growth disappears, and avoid soil work that could damage them during dormancy. The appropriate cleanup date follows plant development and local conditions rather than a fixed calendar. Through winter, avoid water accumulating around the crown and unnecessary work on frozen or saturated ground. American USDA ratings are not automatically equivalent to Canadian zones. Snow cover, wind, drainage and site exposure all contribute to assessing whether a planting position and its winter protection are suitable.
Container growing
A garden,within reach.
For peony container care, assess the growing medium and roots alongside the site and drainage. Open ground suits peonies better than a small pot that remains crowded indefinitely. For a temporary patio display, choose a stable container with drainage and monitor the root ball. Plan subsequent garden planting or winter protection suited to roots that are more exposed to local winter conditions. Choose a stable container with drainage openings and enough room to accommodate the root ball without compressing it. The openings must allow water to escape freely. Use a growing medium suited to the required drainage and moisture, and keep the root ball accessible for routine checks. Leave room for foliage to develop without blocking access, and adjust the container when the roots become too tightly confined. In a pot, the water and nutrient reserve is limited to the volume of growing medium. Check moisture more often during heat and wind without assuming that daily watering is appropriate. Water should moisten the root ball and then drain freely. Adjust feeding to observed needs and the directions for the product being used. Also check that any other plants sharing the container accept the same exposure and watering regime. Prepare for winter before any prolonged ground freezing. Roots in a container standing above ground are more exposed to cold than roots planted in the garden. For a plant already hardy in your region, temporarily sinking the container into well-drained ground can protect the root ball. That protection does not make a tender plant hardy.
Bloom and dimensions
Its place,in your garden.
Mature height
3 feet (91.5 cm)
Width / spread
30 inches (76 cm)
Flower color
Bright crimson
Foliage color
Dark green
Growth rate
Slow
Growth habit
Upright clump
Fragrance
Without pronounced fragrance
Bloom period
Observe peony bloom time together with plant growth, remembering that site conditions affect the flowering calendar seen in the garden. The flowers are bright crimson. Flowering occurs during early summer and late spring; its timing varies with the weather and the stage of plant establishment. Combine selections with different bloom periods to extend the display. Treat the flowering period as a seasonal reference rather than a guaranteed date. Weather, exposure and the stage of establishment can shift the start or duration of the display. Watch developing buds and open flowers when deciding how to maintain the plant.
Harvest
Cut flowering stems for bouquets; decorative use.
Garden associations
In goodcompany.
Companion plants
Choose peony companion plants for compatible site conditions and available space, rather than flower colour alone. For a peony in well-drained ground, consider hardy geraniums, catmint or alliums suited to the same light. Check the requirements of the chosen varieties. Choose companions by exposure, moisture, drainage and mature spread, then check those requirements for the particular varieties selected. Contrasting leaves or flowers can improve a composition without automatically making either plant more resistant. Give each specimen the space it needs and retain watering access. Keep their foliage away from the peony's centre and retain access for installing a support or removing spent flowers during the blooming season. Observe the planting from its main viewpoints before moving a specimen.
Frequently asked questions
Your questions,answered.
How to grow Karl Rosenfield peony in Canada?
Choose an exposure of full sun for this selection. Prepare fertile ground that releases water after rain. Organic matter improves structure, but a hole filled with compost does not correct a saturated planting area. Keep the plant's centre open and prevent the roots of larger neighbours from taking over all its available growing space. Observe the proposed planting site at different times of day before digging. Light changes with trees, buildings and the season. Position the plant where its required exposure can be maintained throughout active growth, and check that watering and border maintenance remain practical. Plan the planting around mature spread rather than the small size of the purchased plant. Leave access to reach specimens in the middle of the bed. Allow foliage to develop without being pressed against edging or buried beneath a more vigorous neighbour.
How should I water Karl Rosenfield peony?
Water the root ball and surrounding ground while the peony establishes. An established plant requires fewer interventions, but watch dry spells and developing buds. Check moisture before watering again; a constantly sodden crown can deteriorate even when the leaves appear to be asking for additional water. Direct water towards the root zone rather than over flowers and leaves. Check soil moisture before adding more: wilted foliage alone cannot distinguish drought from a root problem. Account for the rain that actually reaches the planting, along with heat and wind. During establishment, the original root ball can dry out even when surrounding soil looks moist. Check both areas, especially after light rain or windy weather. Water slowly enough for moisture to enter the soil rather than run off its surface. As roots explore the surrounding ground, adjust watering to actual moisture and weather conditions.
How should I care for Karl Rosenfield peony during flowering?
The flowers are bright crimson. Flowering occurs during early summer and late spring; its timing varies with the weather and the stage of plant establishment. Peony flowering occupies part of the season rather than filling the entire summer. Combine selections with different bloom periods to extend the display. Treat the flowering period as a seasonal reference rather than a guaranteed date. Weather, exposure and the stage of establishment can shift the start or duration of the display. Watch developing buds and open flowers when deciding how to maintain the plant. When the plant’s appearance changes, examine its growing environment first. A buried crown, dry root ball and saturated soil call for different responses. Note when the problem appears and inspect foliage, stems and soil before adding treatments.
Can I grow Karl Rosenfield peony in a container?
Open ground suits peonies better than a small pot that remains crowded indefinitely. For a temporary patio display, choose a stable container with drainage and monitor the root ball. Plan subsequent garden planting or winter protection suited to roots that are more exposed to local winter conditions. Choose a stable container with drainage openings and enough room to accommodate the root ball without compressing it. The openings must allow water to escape freely. Use a growing medium suited to the required drainage and moisture, and keep the root ball accessible for routine checks. Prepare for winter before any prolonged ground freezing. Roots in a container standing above ground are more exposed to cold than roots planted in the garden. For a plant already hardy in your region, temporarily sinking the container into well-drained ground can protect the root ball. That protection does not make a tender plant hardy.
How should I plan Karl Rosenfield peony winter care in Canada?
Through winter, avoid water accumulating around the crown and unnecessary work on frozen or saturated ground. For a Canadian garden, compare the indicated hardiness rating with the rating system used locally and with the actual planting conditions. American USDA ratings are not automatically equivalent to Canadian zones. Snow cover, wind, drainage and site exposure all contribute to assessing whether a planting position and its winter protection are suitable. Prepare for winter before any prolonged ground freezing. Roots in a container standing above ground are more exposed to cold than roots planted in the garden. That protection does not make a tender plant hardy. Remove spent flowers without cutting off leaves that remain active. Support heavy flowers before they lean after rain when needed. At the end of the season, clear dead herbaceous growth. Living branches on a woody peony must stay in place to carry its next season of growth.
Wildlife and pets
Life,around your plants.
Supporting wildlife
The flowers attract butterflies. To watch these garden visits, keep a clear and unobstructed view of the flowers from an accessible path. Sightings change with weather, the progress of flowering and the activity of animals already present. Follow the flowers as they open, leaving room to observe them without stepping on the plant’s roots.
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