Felwort (Swertia perennis)

Also known as: Marsh felwort

Felwort, or autumn gentian (Gentianella amarella), flourishes in well-drained, calcareous soils, commonly found in grasslands and open woodlands. This wildflower typically blooms from late summer to early autumn, between August and October, showcasing its star-shaped flowers in clusters at the top of each stem.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Felwort

Lifespan

Perennial

Plant Type

Herb

Plant Height

30 cm to 46 cm

Spread

8 cm to 15 cm

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

Purple Brown

Images of Felwort

Quickly Identify Felwort

Swertia perennis can be identified by its small, star-shaped blue to violet flowers that have greenish veins. The leaves are lanceolate and the plant often grows in clusters.

Scientific Classification of Felwort

Phylum

Vascular plants

Class

Dicotyledons

Order

Gentianales

Family

Gentian

Genus

Felworts

Species

Felwort

Planting and Growing of Felwort

Care Difficulty

Moderate

Watering Schedule

Every 2 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-8 hours

Ideal Temperature

50-68℉

Soil Type

Potting Mix, Peat Mix

Soil pH

4.5-6.5

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 Felwort?

Swertia perennis thrives in moist conditions, and each watering session should be sufficient to thoroughly moisten the soil without leaving standing water. Aim for around 200 ml of water each time, ensuring the water is absorbed evenly to avoid waterlogged conditions at the roots.

What are the symptoms of an underwatered Felwort? ›

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

What are the symptoms of an overwatered Felwort? ›

How to save an overwatered Felwort? ›

What Are the Sunlight Requirements for Felwort?

Sunlight Requirements: Partial sun

Duration of light: 3 to 5 hours daily

Partial sun conditions offer a balance between too much and too little light, which is crucial for Swertia perennis. This range promotes optimal photosynthesis, robust growth, and vibrant, healthy foliage.

Best Season for Sunlight ›

Sunlight Exposure Duration ›

Best Time of Day for Sunlight ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Felwort?

Ideal Temperature: 50 ~ 68℉

Swertia perennis thrives best in cool to moderately warm temperatures ranging from 50°F to 68°F. This temperature range supports optimal physiological processes, ensuring healthy growth and development. Maintaining this range can aid in proper flowering and seed production.

What Soil is Best for Felwort?

Soil type: Peat soil, Acidic soil

Soil PH: 4.5 ~ 6.5

Swertia perennis thrives in well-draining soils that prevent waterlogging, which can cause root rot and other detrimental conditions. Ensuring good drainage is essential for this plant to uptake nutrients efficiently. A rich organic matter content in the soil supports the growth of Swertia perennis by providing essential nutrients and improving soil structure. This helps in maintaining the moisture balance required for optimal plant health. This plant prefers soils that retain moisture yet do not stay soggy. Proper moisture retention supports consistent growth and prevents stress that can arise from fluctuating water levels.

How to Fertilize Felwort?

Fertilizer type: Balanced

Swertia perennis benefits from a balanced fertilizer. For liquid fertilizer, use a dilution of 1/4 teaspoon (about 1.2 ml) per gallon of water, ensuring you're not overwhelming the plant with nutrients.

How to Prune Felwort?

Pruning Time: Spring, Summer

Begin by carefully assessing Swertia perennis to determine which parts need pruning. Focus on removing any dead, broken, or diseased stems first, as these can hinder the plant's growth. For best results, make your cuts at a 45-degree angle just above a leaf node. This encourages growth and prevents water from collecting on the cut surface, reducing the chance of rot. If the plant has become too dense, selectively thin out some branches to increase air circulation and sunlight penetration, which are essential for the plant's overall health. More About Pruning Techniques→

How to Propagate Felwort plant?

Propagate Time: Spring, Early spring

Collect seeds from mature Swertia perennis plants in late autumn when the seed pods start to dry. Clean and stratify them by placing them in moist sand in the refrigerator for three months to enhance germination rates.

Sow stratified seeds in seed trays or directly in the garden in early spring. Cover with a thin layer of soil and maintain humidity by misting regularly. Ensure they receive indirect sunlight and consistent moisture for optimal growth.

Dig up mature Swertia perennis plants in spring. Use a garden fork to carefully divide the clumps into sections with at least a few roots. Replant immediately in prepared soil and water thoroughly to reduce transplant shock.

More About Propagating Techniques→

How to Repot Felwort plant?

Repotting frequency: Every 2-3 years

Swertia perennis should be repotted when you notice roots crowding out of the drainage holes or the growth appears stunted. The ideal time to repot is during the growing seasons of spring or summer, as the plant can recover quickly from any stress during these active periods.

Opt for a pot that is one size larger than the current one with ample drainage holes. A terracotta pot is ideal as it allows for better air circulation to the roots, helping to prevent water retention that could lead to root rot. The weight of the pot also adds stability to support the plant.

Choose a moist, well-draining soil mix enriched with organic matter. This helps maintain consistent moisture levels which are crucial for Swertia perennis' health, promoting robust root development while avoiding waterlogging. A peat-moss blend with perlite or sand works well to achieve the desired drainage characteristics.