Swallow wort (Vincetoxicum hirundinaria)

Also known as: White swallowwort

Swallow wort (Vincetoxicum hirundinaria) has a scientific name derived from Latin, where "vincetoxicum" translates to "conquer poison" and "hirundinaria" relates to "swallow," likely inspired by the shape of its seedpods. Gardeners in the U.S. are cautioned against planting it because it is an invasive species that can spread rapidly, outcompeting native flora and disrupting local ecosystems.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Swallow wort

Lifespan

Perennial

Plant Type

Herb

Plant Height

30 cm to 70 cm

Spread

90 cm to 1.8 m

Leaf Color

Green

Flower Size

5 mm

Flower Color

Yellow White Green

Images of Swallow wort

Quickly Identify Swallow wort

The plant can be identified by its twining habit, opposite leaves, and white to pale yellow star-shaped flowers that are borne in clusters. The leaves are lanceolate to ovate, and the stems are typically covered with fine hairs.

Scientific Classification of Swallow wort

Phylum

Vascular plants

Class

Dicotyledons

Order

Gentianales

Family

Dogbane

Genus

Vincetoxicum

Species

Swallow wort

Planting and Growing of Swallow wort

Care Difficulty

Moderate

Watering Schedule

Every 4 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-8 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

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 Swallow wort?

When watering Vincetoxicum hirundinaria, it's important to ensure the soil is moist but not waterlogged. Aim for around 250 milliliters of water per session, but always adjust based on the soil's drainage capabilities and the season. During the active growing season, the plant may require a bit more water as compared to the dormant months.

What are the symptoms of an underwatered Swallow wort? ›

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

What are the symptoms of an overwatered Swallow wort? ›

How to save an overwatered Swallow wort? ›

What Are the Sunlight Requirements for Swallow wort?

Sunlight Requirements: Partial sun

Duration of light: 4-6 hours

Partial sun exposure is ideal for Vincetoxicum hirundinaria. This setup supports robust growth and prevents both burn and etiolation. Receiving 4-6 hours of partial sun helps the plant maintain vigorous health and rich foliage.

What is the best position for sunlight? ›

How can I ensure optimal light throughout the year? ›

What environmental setup aids in achieving ideal light? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Swallow wort?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for Vincetoxicum hirundinaria lies between 60°F and 75°F. This range provides the optimal conditions for growth, where the plant can efficiently photosynthesize and flourish. Maintaining temperatures within this range ensures that the plant is not stressed, allowing for robust health and vitality. Keeping a consistent temperature within the ideal range promotes uniform growth and helps prevent problems that can arise from temperature fluctuations.

What Soil is Best for Swallow wort?

Soil type: Loam, Calcareous soil

Soil PH: 6.5 ~ 7.5

Vincetoxicum hirundinaria thrives in well-drained soil that helps prevent waterlogging and root rot, ensuring the plant has adequate oxygen and nutrients for optimal growth. The plant benefits from soil enriched with nutrients, which supports healthy foliage and robust flowering, helping it to thrive in its environment. A soil with moderate fertility provides Vincetoxicum hirundinaria with the necessary balance of nutrients, preventing excessive growth or nutrient burn, which helps maintain a healthy and sustainable growth rate.

How to Fertilize Swallow wort?

Fertilizer type: Balanced

For Vincetoxicum hirundinaria, the fertilization amount should be moderate. Use a balanced fertilizer with an N-P-K ratio like 10-10-10 or 20-20-20. For liquid fertilizers, dilute them to half strength to avoid root burn.

How to Prune Swallow wort?

Pruning Time: Spring, Summer

Start by inspecting the plant for any old, dead, or diseased stems. These should be the first to be pruned as they can harbor pests or diseases and hinder the plant's overall vigor. Vincetoxicum hirundinaria can be pruned to maintain a desirable shape. Aim to create an open structure that allows light and air to penetrate the plant, reducing the risk of fungal issues. Cut back vigorous stems slightly above a pair of leaves or nodes to encourage branching and the growth of new shoots, which will contribute to a fuller appearance. More About Pruning Techniques→

How to Propagate Swallow wort plant?

Propagate Time: Spring, Early summer

To propagate Vincetoxicum hirundinaria by seeds, collect mature seeds from the plant in late summer when the seed pods have fully dried.

Use a well-draining mix of peat and perlite to fill seed trays, ensuring the medium is moist but not oversaturated before seed sowing.

For division propagation, carefully remove the plant from its pot and gently separate the roots into smaller sections with at least two shoots each.

More About Propagating Techniques→

How to Repot Swallow wort plant?

Repotting frequency: Every 2 years

Repot Vincetoxicum hirundinaria when you notice roots emerging from the drainage holes or the growth has noticeably slowed. Spring and early summer offer ideal conditions for repotting because the plant can quickly recover and establish in its new pot.

Select a pot slightly larger than the current one, with sufficient drainage holes. A terra-cotta or ceramic pot can provide stability while helping to wick away excess moisture, reducing the risk of root rot.

Opt for a well-draining potting mix, possibly enriched with some perlite or sand. This combination offers plenty of air pockets to support root respiration, preventing soggy conditions that can lead to root diseases.

Toxicity

Ingestion

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.