How soon after planting do perennials bloom?
Written by
Michael Sullivan
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Comprehending bloom timing after perennials are planted is based on a few important factors: season of planting, plant type. Spring planted summer bloomers can reach flowering stage in a matter of months, while fall-planted ones might need to be dormant over winter before blooming. I've recorded bloom timings on hundreds of installation sites to give an accurate expectation.
Soil Preparation
- Amend with phosphorus-rich bone meal to stimulate flowering
- Maintain pH between 6.0-7.0 for nutrient availability
- Ensure 8+ hours sun for sun-loving varieties
Post-Planting Care
- Water consistently during first 6 weeks to prevent stress
- Apply bloom-booster fertilizer at first sign of buds
- Deadhead spent flowers to redirect energy to new blooms
Warm soil and longer days in the spring can lead to rapid growth, with blooms appearing 3-4 months before summer for summer-blooming plants, such as daylilies. I have had coneflowers bloom from May planting in only 10 weeks (when treated with kid gloves). No question, these are the quickest flowering returns.
Plants that bloom in the spring but are planted in the fall, like peonies and bleeding hearts, must first go through winter dormancy before their blooms, typically between 6 and 9 months of dormancy. The time spent honing in their roots allows the plant to build up energy reserves. The fall-planted example I have installed in my clients' yards always outperforms the spring-planted examples.
Slow starters (such as biennials) like peonies from root divisions need full growing seasons. A foxglove that is planted in spring will not flower until the following spring. Tree peonies take 2-3 years to flower. Waiting to be rewarded with outstanding flowering, after the establishment period, will be the downside of patience.
Environmental factors greatly affect bloom timing. Too little sun will slow flowering, and good nutrition will speed it up. Field tests in my Zone 6 indicated that, with well-amended beds, flowering occurred 30% quicker. Always be observing the plants and adjust the care accordingly.
Choosing varieties will influence your expectations.Research on the average bloom times for specific cultivars. Early-blooming phlox varieties will bloom faster than late-blooming types. Choosing plants that are adapted to your region will help ensure that they will meet typical bloom timelines. This knowledge will help allay disappointment.
Read the full article: When to Plant Perennials: Expert Guide
