Growing Non-GMO Karl Rosenfield Peony Flower Bulbs

This variety of peonies is primarily grown outdoors, as it thrives in garden settings with ample space and sunlight. Peonies, including Karl Rosenfield, are typically planted in the fall, around late September to October, allowing them time to establish roots before the winter sets in. When planting, the eyes (buds) of the peony should be positioned 1 to 2 inches below the soil surface. If planted too deep, the peony may fail to bloom.

Soil conditions are crucial for peonies, as they prefer well-draining, rich soil with a pH that is neutral to slightly acidic (around 6.5 to 7.0). If the soil is too compacted or heavy, amending it with organic matter such as compost can improve drainage and fertility. Space plants 2 to 3 feet apart to give them enough room to grow and to ensure good air circulation, which helps prevent fungal issues. Karl Rosenfield Peonies do best in full sun, requiring 6 to 8 hours of sunlight per day to promote strong blooms. In warmer climates, some afternoon shade can help protect them from the heat, but too much shade will reduce flowering. After planting, water the peony thoroughly to settle the soil around the roots.

After the initial blooming, peonies do not generally re-bloom during the season. After the blooming period, deadhead spent flowers to encourage energy storage in the roots. In late fall, once the foliage has died back, cut stems to ground level to minimize disease risk and prepare the plant for winter dormancy. For strong perennial blooming power, it's essential to give peonies time to establish; often, they don’t bloom much in their first year but improve with age. Dividing the plant every 10 to 15 years can also help rejuvenate older peonies and encourage more vigorous blooming.

Peonies do best with fertilization in early spring before new growth begins. A balanced fertilizer (like 10-10-10) or one specifically for flowering plants works well. Avoid excessive nitrogen, which promotes leaf growth instead of blooms. Regular watering is crucial during the growing season, especially during dry spells, but be careful not to overwater, as peonies are prone to root rot if left in soggy conditions. Mulching around the base of the plant helps retain moisture and keeps the soil cool, but avoid piling mulch directly against the stems.

To ensure the best health from year to year, cut back the foliage in the fall after it has died. In colder zones, peonies benefit from winter protection. Applying a light layer of mulch after the ground freezes can protect roots in colder climates, but remember to remove it in early spring to allow new growth.

Karl Rosenfield Peony in the Flower Garden

The Karl Rosenfield Peony is a versatile and showy flower often used as a focal point in garden beds or mass-planted for dramatic effect. Due to its height (around 2 to 3 feet), it can be used in borders or mid-to-back garden placements. Its large, ruffled, romantic, double blooms attract pollinators. It is generally deer- and rabbit-resistant, as most woodland creatures avoid peonies due to their bitter taste. 'Karl Rosenfield' peonies pair well with plants like garden geraniums, ornamental onions, and aquilegia. The blooms are also fragrant, with a light, sweet scent that makes them ideal for cut flowers. They’re frequently used in floral arrangements and have a long vase life.

Harvesting the Karl Rosenfield Peony

To harvest Karl Rosenfield Peonies for cut flower arrangements, the best time to cut them is when the buds are in the "soft marshmallow" stage: when they feel soft to the touch but haven't fully opened. They will continue to open after being cut. Use clean, sharp shears to cut the stems in the morning when temperatures are cooler. For maximum vase life, immediately place the cut stems in water and store them in a cool, dark place if you won’t be using them immediately. Change the water every couple of days and trim the stems at an angle to maintain hydration. Flower food can also be helpful.

About Karl Rosenfield Peony Garden Bulbs

Ingesting any part of the plant, including the stems, foliage, or flowers, can cause symptoms like nausea, vomiting, and diarrhea. This applies to pets, especially dogs and cats, who should be kept away from peonies to avoid accidental poisoning.

Karl Rosenfield grows in a lush, bushy mound with glossy, dark green foliage that remains attractive throughout the growing season. In simple terms, it's a sturdy, upright plant that adds structure and beauty to any garden space. ​

Introduced in 1908 by Nebraskan breeder John Rosenfield, it was named for his son, Karl. This cultivar has become a timeless favorite among gardeners for its dependable performance and striking appearance.

Peonies have been cultivated for over two millennia and are loved for their abundant blooms and delicate fragrance. Karl Rosenfield peonies will be in peak bloom for 1-2 weeks.

Peonies, especially the Karl Rosenfield variety, are known for their incredible longevity. Once established, they can thrive in the same location for half a century or more with minimal care. This makes them a fantastic investment for gardeners looking to create a long-term, low-maintenance garden with reliable beauty year after year.

Make Planting Bulbs Easy with a Bulb Planter Hand Tool!

Stories From Our Gardeners

"I resonate with peonies. It may sound silly, but I, too, only have short bursts of beauty in me at a time, and then I need to retreat in order to recharge next time. I also am generally low-maintenance but have just a few things that need to be kept right, or else I will wilt. It’s funny how much in common we have with plants."

- Lara Wadsworth, True Leaf Market Writer

Karl Rosenfield Peony Flower Bulbs Per Package:

• 1 Bulb Bag
• 3 Bub Bag

Non-GMO Karl Rosenfield Peony Bulbs are available for Fast Free Shipping on qualifying orders.