Alkali swainsonpea (Sphaerophysa salsula)

Also known as: Australian pea weed, Austrian peawood

Alkali swainsonpea (Sphaerophysa salsula) is an aggressive invasive species. It frequently appears near alfalfa fields because its seeds resemble those of alfalfa and are difficult to distinguish. This plant harbors symbiotic bacteria called endophytes.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Alkali swainsonpea

Lifespan

Perennial

Plant Type

Herb, Shrub

Plant Height

30 cm to 1.3 m

Spread

Approximately 0.5 to 1 meter

Leaf Color

Green

Flower Size

1.3 cm to 1.5 cm

Flower Color

Red Orange

Images of Alkali swainsonpea

Quickly Identify Alkali swainsonpea

The plant can be identified by its upright stems, which can reach up to 1.5 meters in height. Its leaves are alternately arranged and compound, usually with three leaflets. The flowers are small, yellow, and borne in clusters at the end of the stems.

Scientific Classification of Alkali swainsonpea

Phylum

Vascular plants

Class

Dicotyledons

Order

Fabales

Family

Legume

Genus

Sphaerophysa

Species

Alkali swainsonpea

Planting and Growing of Alkali swainsonpea

Care Difficulty

Easy

Watering Schedule

Every day

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

68-86℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-8

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

Once a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Alkali swainsonpea?

Sphaerophysa salsula requires careful watering attention. The goal is to soak the root zone thoroughly without leaving standing water. A monthly soak with about 500ml ensures its roots are adequately hydrated, mimicking its natural arid habitat.

What are the symptoms of an underwatered Alkali swainsonpea? ›

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

What are the symptoms of an overwatered Alkali swainsonpea? ›

How to save an overwatered Alkali swainsonpea? ›

What Are the Sunlight Requirements for Alkali swainsonpea?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6-8 hours daily

Sphaerophysa salsula thrives in full sun for 6-8 hours daily. Ideal light exposure enhances photosynthesis, promoting healthy vigor and lush foliage while supporting robust flowering and growth consistency.

What is the best location for Sphaerophysa salsula? ›

What solutions can adjust the lighting for Sphaerophysa salsula? ›

What are the benefits of optimal light exposure for Sphaerophysa salsula? ›

What Is the Ideal Temperature Range for Alkali swainsonpea?

Ideal Temperature: 68 ~ 86℉

Sphaerophysa salsula thrives best at temperatures between 68°F and 86°F. This range provides the optimal conditions for growth and development, ensuring the plant maintains a healthy and robust structure.

What Soil is Best for Alkali swainsonpea?

Soil type: Sandy loam, Loam

Soil PH: 6.5 ~ 8

Sphaerophysa salsula thrives in soils with excellent drainage. This prevents root rot and ensures the plant receives the right amount of oxygen, contributing to its robust growth. A medium level of nutrients in the soil supports Sphaerophysa salsula's growth. Though not overly demanding, an adequate supply of nutrients ensures optimal health and flowering. A well-structured soil allows Sphaerophysa salsula to anchor securely and facilitates root penetration, promoting a strong base for the plant and resilience against environmental stressors.

How to Fertilize Alkali swainsonpea?

Fertilizer type: Balanced

For Sphaerophysa salsula, a balanced approach to fertilizing is essential. Apply liquid fertilizer at a rate of about 1 teaspoon per gallon of water. This should be used to sufficiently moisten the soil without causing runoff. Ensure that the fertilizer doesn't contain excessive nitrogen, which might burn the plant roots.

How to Prune Alkali swainsonpea?

Pruning Time: Spring, Summer

Ensure you have a pair of clean, sharp pruning shears. Sterilize the blades before use to prevent the spread of disease. It’s crucial to have the right tools ready to make clean cuts without damaging the plant. Identify any damaged, dead, or diseased branches for removal. Additionally, focus on cutting back overgrown branches that disrupt the plant's shape or encroach on other plants. Cutting these will ensure better airflow and sunlight penetration throughout the plant. Prune back branches to a junction or a bud to encourage new growth. Clean cuts heal better and minimize the chance of infection. After pruning, inspect the plant to ensure an even and pleasing shape, promoting healthy regrowth. After pruning, consider applying a balanced fertilizer to support recovery and growth. This extra boost of nutrients can help the plant recover from any stress caused by pruning and encourage more vigorous growth. More About Pruning Techniques→

How to Propagate Alkali swainsonpea plant?

Propagate Time: Spring, Late spring, Early spring

Begin by filling a seed tray with a sterile potting mix. Sow the seeds evenly across the surface, pressing them lightly into the mix. Water gently to keep the soil moist but not waterlogged.

Select healthy stems from the parent plant and cut them at an angle. Ensure that each cutting is about 6-8 inches long and remove any lower leaves to reduce moisture loss.

Dip the cut end of the prepared stem cuttings into rooting hormone powder. This encourages faster root development and increases the chances of successful propagation.

How to Repot Alkali swainsonpea plant?

Repotting frequency: Every 2-3 years

Repotting is necessary when Sphaerophysa salsula shows signs of being root-bound, such as roots growing out of the pot or reduced growth. Ideally, do this in spring or summer, when the plant enters its active growing phase, allowing it to recover and adapt to the new pot more efficiently.

Select a pot that is one size larger than the current one, with ample drainage holes. This ensures excess water can escape, preventing root rot. The extra space allows roots to grow and expand, promoting healthier growth and reducing the need for frequent repotting.

Opt for a well-draining potting mix, rich in organic matter. Such soil mimics the plant's natural habitat, providing necessary nutrients and preventing waterlogging. A well-structured mix will keep roots healthy, ensuring robust plant growth and vibrant foliage.

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.