Dutchman's laudanum (Passiflora rubra)

Also known as: Red Passionflower, Scarlet Passionflower

Dutchman's laudanum, commonly known as Datura stramonium or Jimsonweed, is not a tropical vine but rather a hardy annual plant. It features large, trumpet-shaped white or purple flowers and jagged-edged leaves. This plant thrives in warm, temperate regions with well-drained soil and ample sunlight. It often grows in disturbed areas such as roadsides and fields. Its flowers attract night-flying pollinators like moths, aiding in its reproduction and spread.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Dutchman's laudanum

Lifespan

Perennial

Plant Type

Vine

Plant Height

3-6 meters

Spread

Not applicable, as it is a vine

Leaf Color

Dark green

Flower Size

7-10 cm

Flower Color

Red

Images of Dutchman's laudanum

Quickly Identify Dutchman's laudanum

Identification of Passiflora rubra involves looking for its distinct red flowers, five-lobed leaves, and tendril-bearing vines. The flowers typically have radial symmetry with a prominent corona.

Scientific Classification of Dutchman's laudanum

Phylum

Vascular plants

Class

Dicotyledons

Order

Malpighiales

Family

Passionflowers

Genus

Passion flowers

Species

Dutchman's laudanum

Planting and Growing of Dutchman's laudanum

Care Difficulty

Moderate

Watering Schedule

Every 4 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-8 hours

Ideal Temperature

68-77℉

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

Ceramic, Plastic

How to Water Dutchman's laudanum?

For Passiflora rubra, water thoroughly but ensure that the soil drains well. Typically, 250 ml of water should suffice per session, allowing the soil to be evenly moist but never soggy.

What are the symptoms of an underwatered Dutchman's laudanum? ›

What should I do if my Dutchman's laudanum is not getting enough water? ›

What are the symptoms of an overwatered Dutchman's laudanum? ›

How to save an overwatered Dutchman's laudanum? ›

What Are the Sunlight Requirements for Dutchman's laudanum?

Sunlight Requirements: Partial sun, Full sun

Duration of light: 6-8 hours daily

Passiflora rubra's ideal light condition is partial sun, ensuring vibrant blooms and robust growth while preventing overheating of foliage.

How much sun does Passiflora rubra need? ›

How to ensure adequate sunlight for Passiflora rubra? ›

What happens if Passiflora rubra gets optimal light? ›

What Is the Ideal Temperature Range for Dutchman's laudanum?

Ideal Temperature: 68 ~ 77℉

Passiflora rubra thrives in environments where the temperature remains consistently between 68 and 77 degrees Fahrenheit. This range mimics the plant's native tropical habitat, providing the optimal conditions for photosynthesis and overall plant health.

What Soil is Best for Dutchman's laudanum?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

The plant thrives in well-draining soils that prevent waterlogging, ensuring healthy root development and preventing root rot, which is vital for sustained growth. Moderately fertile soils provide essential nutrients without excess, supporting steady growth and vibrant flowering, essential for the plant's ornamental appeal. Soils that retain moisture sufficiently without becoming soggy are crucial, helping the plant to remain hydrated during dry spells, conducive to its overall vitality.

How to Fertilize Dutchman's laudanum?

Fertilizer type: Balanced

For Passiflora rubra, it's important to apply fertilizers at the right amounts. A balanced 10-10-10 liquid fertilizer can be used at 1/2 strength to promote healthy growth. For slow-release options, follow the manufacturer's instructions, but a general guideline is to use about one tablespoon per plant per application.

How to Prune Dutchman's laudanum?

Pruning Time: Spring, Summer, Autumn

When pruning, aim to make clean cuts at a 45-degree angle, just above a leaf node. This ensures that water does not accumulate on the cut, preventing rot and facilitating quicker healing of the plant. Collect the pruned branches and leaves and dispose of them appropriately. Avoid leaving them around the plant as they can harbor pests and diseases that may return to infect the healthy parts of the plant. More About Pruning Techniques→

How to Propagate Dutchman's laudanum plant?

Propagate Time: Spring, Early summer

Before planting, soak the seeds in warm water for 24 hours. This process helps in softening the seed coat, which facilitates quicker germination and increases the success rate of seed propagation.

Choose healthy, disease-free stems from the parent plant. Cut 4-6 inch sections using sterilized pruning shears to prevent the spread of infections and ensure better rooting success.

For seeds, sow them in prepared trays with a mix of peat and sand. For cuttings, insert the cut end into a moist propagating medium such as perlite. Keep the medium consistently moist but not soggy.

More About Propagating Techniques→

How to Repot Dutchman's laudanum plant?

Repotting frequency: Every 1-2 years

Repotting should be considered when Passiflora rubra shows signs of being root-bound, such as roots growing out of drainage holes or a noticeable slowdown in growth. Early spring, when the plant begins to actively grow, is ideal as it allows the plant to quickly adapt to its new environment.

Select a pot that is just one size larger than the current one, with good drainage holes. This prevents waterlogging and promotes healthy root development. Clay pots are a great choice as they are breathable, which helps to prevent root rot by allowing excess moisture to evaporate.

Opt for a well-draining potting mix; it should be light and fluffy to prevent compacting. A good mix contains peat, perlite, and a bit of sand, ensuring that roots receive adequate oxygen and reducing risks of fungal diseases.