Black swallow-wort (Vincetoxicum nigrum)

Also known as: Black dog-strangling vine, Black swallowwort, Climbing poison

Kudzu (Pueraria montana) is an invasive perennial vine flourishing in sunny open spaces. This vine establishes dense colonies, displacing native vegetation and threatening natural ecosystems. Kudzu propagates vigorously through an extensive root system and seeds dispersed by the wind.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Black swallow-wort

Lifespan

Perennial

Plant Type

Vine, Herb

Plant Height

61 cm to 1.8 m

Spread

90 cm

Leaf Color

Green

Flower Size

Approximately 0.5 cm

Flower Color

Purple Red Brown Black

Images of Black swallow-wort

Quickly Identify Black swallow-wort

This plant can be identified by its dark green, glossy leaves that are opposite and lance-shaped. The small, star-shaped flowers are dark purple to black and appear in clusters. It typically climbs over other vegetation or structures.

Scientific Classification of Black swallow-wort

Phylum

Vascular plants

Class

Dicotyledons

Order

Gentianales

Family

Dogbane

Genus

Vincetoxicum

Species

Black swallow-wort

Planting and Growing of Black swallow-wort

Care Difficulty

Hard

Watering Schedule

Every 2 days

Sunlight Requirements

Partial sun

Sunshine Duration

6-10 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 Black swallow-wort?

For Vincetoxicum nigrum, it's crucial to water deeply but infrequently. The soil should be soaked until water drains out of the bottom of the pot, which helps ensure the roots are getting sufficient moisture without sitting in water.

What are the symptoms of an underwatered Black swallow-wort? ›

What should I do if my Black swallow-wort is not getting enough water? ›

What are the symptoms of an overwatered Black swallow-wort? ›

How to save an overwatered Black swallow-wort? ›

What Are the Sunlight Requirements for Black swallow-wort?

Sunlight Requirements: Partial sun, Full sun

Duration of light: 4 to 6 hours

Partial sun is ideal, providing dappled to direct sunlight. It supports photosynthesis without the stress of intense light, fostering lush growth and vibrant foliage in Vincetoxicum nigrum.

How much sun does Vincetoxicum nigrum need? ›

What is the best setup for ideal sunlight? ›

Why is proper sunlight important for this plant? ›

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What Is the Ideal Temperature Range for Black swallow-wort?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for Vincetoxicum nigrum is between 60°F and 75°F. During this range, the plant is likely to thrive, exhibiting optimal growth and vibrancy. It facilitates efficient photosynthesis and nutrient uptake, ensuring that the plant maintains its health and vigor. Keeping the plant in this temperature range mimics its natural habitat, providing an environment conducive to its needs.

What Soil is Best for Black swallow-wort?

Soil type: Loam, Sandy loam, Calcareous soil

Soil PH: 6.5 ~ 7.5

Vincetoxicum nigrum thrives in well-draining soil, which prevents waterlogging and root rot. This requirement enhances the plant's root health and overall vigor by ensuring proper aeration and nutrient uptake. The plant benefits from fertile soil rich in organic matter, which provides essential nutrients for growth and flowering. Ample nutrients contribute to vibrant foliage and increased resilience to pests and diseases. While well-draining, the soil should retain enough moisture to support steady growth. This balance helps maintain plant hydration without over-saturation, proving critical during dry spells. More About Soil→

How to Fertilize Black swallow-wort?

Fertilizer type: Balanced

For Vincetoxicum nigrum, ensure moderate application; use approximately 10 grams of balanced granular fertilizer per plant during the growing season. Liquid fertilizers should be diluted to half strength to prevent nutrient burn, providing steady growth without lush, weak foliage. More About Fertilizing Techniques→

How to Prune Black swallow-wort?

Pruning Time: Spring, Summer, Autumn

Start by sterilizing your pruning shears to prevent the spread of disease. Look for any dead, damaged, or diseased branches and remove them completely. Cut back any overly vigorous growth to maintain the plant's desired shape and remove any branches that cross over or rub against each other to prevent damage. To maintain a neat appearance, trim the stems that have grown too long and are out of shape. Focus on pinching or trimming the tips to encourage bushy growth. This practice not only improves the plant's aesthetics but also promotes a fuller look by stimulating the growth of side shoots. More About Pruning Techniques→

How to Propagate Black swallow-wort plant?

Propagate Time: Spring, Late spring

Collect seeds from mature Vincetoxicum nigrum plants in late autumn. Ensure they are dry and free from pests, storing them in a cool, dry place until planting.

Select healthy stems from the parent plant, cutting 4 to 6 inches of stem just below a node. Strip the lower leaves, leaving two to three at the top.

Plant seeds or cuttings in a propagation medium. Keep the environment humid and warm, ensuring adequate light. Water sparingly but consistently to maintain moisture.

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How to Repot Black swallow-wort plant?

Repotting frequency: Every 2-3 years

Vincetoxicum nigrum should be repotted when you notice roots growing out of the drainage holes or when it has become rootbound, which means the roots have filled the pot entirely. Early spring is ideal, as the plant can easily recover and take advantage of the growing season.

Select a pot that is 2-3 inches larger in diameter than the current one and has good drainage holes. This allows the roots to expand and prevents waterlogging, which can lead to root rot. A clay or terracotta pot is preferred because it encourages air and moisture exchange.

Choose a well-draining potting mix that contains components such as perlite, peat, and sand. This mixture mimics the natural habitat of the plant and ensures good aeration while retaining enough moisture, thereby promoting healthy root growth.

Toxicity of Black swallow-wort

Is Black swallow-wort toxic to humans?

The black swallow-wort possesses toxic characteristics that may lead to adverse effects in humans upon ingestion of the plant. Various parts of the plant, especially the roots, are considered toxic due to the presence of a harmful alkaloid known as vincetoxin.

Is Black swallow-wort toxic to cat?

Black swallow-wort exhibits a mild level of toxicity to cats. If felines consume substantial amounts of any part of this plant, they may encounter various health issues. The signs of poisoning typically manifest as indications of physical distress or sickness, although these symptoms might not become evident right away unless a large quantity of the plant has been ingested. Given the potential dangers, it is crucial for cat owners to vigilantly observe their pets and seek prompt veterinary assistance if they believe their cat has consumed black swallow-wort. Receiving timely medical care is vital for reducing the risks associated with the toxins found in this plant.

Is Black swallow-wort toxic to dog?

Black swallow-wort presents a modest toxicity risk to dogs. Canines can suffer from poisoning after ingesting this plant in significant quantities. Every part of black swallow-wort is toxic; therefore, consuming any part, be it leaves, stems, flowers, or seeds, may potentially lead to poisoning. The symptoms of poisoning can vary but may include gastrointestinal distress such as vomiting and diarrhea. Given the inherent risks associated with this plant, dog owners should remain alert and prevent their pets from entering areas where black swallow-wort is present. If a dog is suspected of having consumed black swallow-wort, it is essential for the owner to swiftly seek assistance at a veterinary clinic to safeguard the health and well-being of their pet.

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.

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