Pimpernel willowherb (Epilobium anagallidifolium)

Also known as: Pimpernel-leaved willowherb

The Pimpernel Willowherb (Epilobium anagallidifolium) is a wildflower that flourishes in cold northern boreal regions and alpine or subalpine mountain areas further south. With its small, trumpet-shaped blooms, it draws in hummingbirds, butterflies, and various pollinating insects, making it a valuable plant for gardens in these environments.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Pimpernel willowherb

Lifespan

Perennial

Plant Type

Herb

Plant Height

5 cm to 20 cm

Spread

20 cm to 30 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

White Purple Red

Images of Pimpernel willowherb

Quickly Identify Pimpernel willowherb

Identifiable by its small, pink to purple flowers and lance-shaped to ovate leaves. The plant often forms low, mat-like patches and has stems that are mostly decumbent.

Scientific Classification of Pimpernel willowherb

Phylum

Vascular plants

Class

Dicotyledons

Order

Myrtales

Family

Evening primrose

Genus

Willowherbs

Species

Pimpernel willowherb

Planting and Growing of Pimpernel willowherb

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-6 hours

Ideal Temperature

50-60℉

Soil Type

Potting Mix, Peat Mix

Soil pH

5.5-7

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Pimpernel willowherb?

For Epilobium anagallidifolium, watering should be moderately done. Aim to keep the soil consistently moist but not waterlogged. Water until the topsoil is adequately moist up to a depth of half an inch, ensuring that the moisture reaches to the root zone efficiently.

What are the symptoms of an underwatered Pimpernel willowherb? ›

What should I do if my Pimpernel willowherb is not getting enough water? ›

What are the symptoms of an overwatered Pimpernel willowherb? ›

How to save an overwatered Pimpernel willowherb? ›

What Are the Sunlight Requirements for Pimpernel willowherb?

Sunlight Requirements: Partial sun, Full sun

Duration of light: 4-8 hours daily

Epilobium anagallidifolium thrives in partial to full sun conditions, meaning exposure to four to eight hours of sunlight daily is optimal. This range supports photosynthesis, fostering robust growth and vibrant blooms and contributing to the plant's overall vitality and resilience.

What is the ideal light condition for Epilobium anagallidifolium? ›

How can I provide the ideal lighting for Epilobium anagallidifolium? ›

What benefits does ideal lighting bring to Epilobium anagallidifolium? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Pimpernel willowherb?

Ideal Temperature: 50 ~ 60℉

The ideal temperature range for cultivating Epilobium anagallidifolium is between 50°F and 60°F. This range closely mimics the plant's natural alpine and subalpine environment, allowing it to thrive and grow robustly. Consistent exposure to these temperatures enhances its foliage and flower production, maintaining overall health.

What Soil is Best for Pimpernel willowherb?

Soil type: Loam, Sandy loam, Acidic soil

Soil PH: 5.5 ~ 7

Epilobium anagallidifolium thrives in well-drained soils where excess water can easily escape. This prevents root rot and other moisture-related issues, promoting healthier root systems and vigorous growth. While drainage is crucial, the soil must also retain enough moisture to support the plant during dry spells. Sandy loam is excellent in this regard as it balances drainage with moisture retention, ensuring the plant remains hydrated. A nutrient-rich soil, like loam, provides essential minerals for the plant's development. This ensures lush, abundant foliage and vibrant, long-lasting blooms throughout its growing season.

How to Fertilize Pimpernel willowherb?

Fertilizer type: Balanced

For Epilobium anagallidifolium, use a balanced liquid fertilizer at a quarter strength to avoid over-fertilization. Apply about 5 milliliters per liter of water. Distribute the mixture evenly across the soil to ensure proper nutrient absorption.

How to Prune Pimpernel willowherb?

Pruning Time: Spring, Summer, Autumn, Winter

Start by identifying dead or diseased stems and remove them using sterilized pruning shears. Focus on cutting back stems just above healthy buds to encourage new growth. Trim back around a third of the overall size to maintain a compact shape. Ensure cuts are clean to minimize stress on the plant. More About Pruning Techniques→

How to Propagate Pimpernel willowherb plant?

Propagate Time: Early spring, Late spring, Summer

To start seed propagation, prepare a seedbed with a well-draining soil mix. This provides the ideal environment for seeds to germinate and develop strong root systems.

Select a strong, disease-free section of the plant for cuttings. Cut just below a node to ensure the cutting has enough nutritional reserves to establish new roots.

For division propagation, gently lift the plant from the soil and separate the root clumps by hand or with a sharp knife to ensure each section has ample roots and foliage for growth.

How to Repot Pimpernel willowherb plant?

Repotting frequency: Once every three years

Epilobium anagallidifolium shows signs of needing a repot when it becomes root-bound, with roots emerging from the pot's drainage holes. Also, if the plant shows stunted growth or the soil dries out quickly after watering, it's time to repot. Choose the warmer months of spring or summer for optimal root recovery and growth.

Select a new pot that is only slightly larger than the current one, with ample drainage holes to prevent waterlogging. A pot that is too big may lead to excessive soil moisture, which can harm the roots. A clay or terracotta pot is ideal as it allows the soil to breathe, facilitating better moisture control.

Opt for a well-draining soil mix composed of peat, perlite, and sand. This blend prevents water retention, which is crucial for preventing root rot. The lightweight texture allows roots to expand easily, encouraging healthier root development and nutrient uptake.