Fourpetal St. John's wort (Hypericum tetrapetalum)

Also known as: Fourpetal St. John’s Wort, Four Petal St. John's-wort

Fourpetal St. John's wort (Hypericum tetrapetalum) is easily recognized by its striking yellow flowers, each featuring four distinct petals. This perennial shrub typically grows to a modest height of around 2 feet and flourishes in sunny, well-drained environments.

Key characteristics include:
- **Flowers**: Vivid yellow with four petals, blooming mainly from late spring through fall.
- **Leaves**: Simple, opposite, and sessile with a smooth edge, providing a pleasing contrast to the flowers.
- **Stem**: Often exhibits a reddish or purplish hue.

Ideal growing conditions:
- **Sunlight**: Prefers full sun but can tolerate partial shade.
- **Soil**: Well-suited to sandy or rocky soils with good drainage.
- **Water**: Once established, it is drought-resistant but benefits from occasional watering.

Native to the southeastern U.S., this plant is perfect for wildflower gardens and natural landscapes, where it attracts pollinators and adds vibrant color.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Fourpetal St. John's wort

Lifespan

Perennial

Plant Height

30 to 60 cm

Spread

30 to 60 cm

Leaf Color

Green

Flower Size

1 to 2 cm

Flower Color

Yellow

Images of Fourpetal St. John's wort

Quickly Identify Fourpetal St. John's wort

Hypericum tetrapetalum can be identified by its four-petaled yellow flowers and opposite leaves. The plant typically has a shrubby appearance and blooms primarily in the summer.

Scientific Classification of Fourpetal St. John's wort

Phylum

Vascular plants

Class

Dicotyledons

Order

Malpighiales

Family

St. John's wort

Genus

St. John's worts

Species

Fourpetal St. John's wort

Planting and Growing of Fourpetal St. John's wort

Care Difficulty

Moderate

Watering Schedule

Every 2 days

Sunlight Requirements

Full 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 Fourpetal St. John's wort?

Hypericum tetrapetalum, also known as the four-petal St. John's wort, requires about 500ml of water per session. It thrives best when the soil is moist but not overly saturated. This ensures that the roots receive adequate moisture without drowning them, which could lead to root rot. Always check the top inch of soil; if it's dry, that’s a good cue for watering.

What are the symptoms of an underwatered Fourpetal St. John's wort? ›

What should I do if my Fourpetal St. John's wort is not getting enough water? ›

What are the symptoms of an overwatered Fourpetal St. John's wort? ›

How to save an overwatered Fourpetal St. John's wort? ›

What Are the Sunlight Requirements for Fourpetal St. John's wort?

Sunlight Requirements: Full sun

Duration of light: 6-8 hours daily

Hypericum tetrapetalum thrives in environments with full sun exposure, requiring at least six to eight hours daily. Proper light ensures vigorous growth and prolific blooming in this species.

Optimal Exposure Duration ›

Solutions for Achieving Ideal Light ›

Benefits of Ideal Light ›

What Is the Ideal Temperature Range for Fourpetal St. John's wort?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for cultivating Hypericum tetrapetalum is between 60°F and 75°F. This range supports the plant's physiological processes, ensuring optimal respiration and photosynthesis rates. Temperatures within this range promote healthy growth and flowering.

What Soil is Best for Fourpetal St. John's wort?

Soil type: Sandy soil, Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Hypericum tetrapetalum thrives in well-draining soil to prevent root rot. Sandy or loamy soils with good permeability ensure excess water doesn’t linger, providing a healthier environment for the plant's roots. A moderately fertile soil is ideal for Hypericum tetrapetalum, as it supplies adequate nutrients without the risk of over-fertilization. This balance fosters steady growth and lush foliage. This plant prefers soil with a pH range from 6.5 to 7.5, which offers a balanced range to maximize nutrient uptake while avoiding nutrient lock-out common in more extreme pH levels.

How to Fertilize Fourpetal St. John's wort?

Fertilizer type: Balanced

For Hypericum tetrapetalum, it is advisable to use a balanced fertilizer, with an NPK ratio of 10-10-10. When applying liquid fertilizer, dilute to half strength to avoid root burn, typically around one tablespoon per gallon of water.

How to Prune Fourpetal St. John's wort?

Pruning Time: Spring, Summer, Autumn

Begin pruning in early spring just before new growth emerges. This timing helps stimulate fresh, vigorous growth and ensures the plant has a full season to recover and bloom beautifully. Focus on cutting back about one-third of the oldest stems at the base. This rejuvenates the plant and opens up the center, which improves light penetration and air circulation, crucial for healthy foliage. After removing old and dead stems, trim back the remaining branches to maintain a pleasing, rounded shape. Be mindful that over-pruning can stress the plant, so ensure to leave enough foliage for sustenance. More About Pruning Techniques→

How to Propagate Fourpetal St. John's wort plant?

Propagate Time: Spring, Early spring, Late spring

For seed propagation, fill seed trays with a seed-starting mix and sow Hypericum tetrapetalum seeds lightly on the surface. Cover with a thin layer of soil and keep moist but not waterlogged. Germination takes several weeks.

In cutting propagation, select healthy, non-flowering stems and cut sections about 4-6 inches long. Remove the lower leaves and dip the cut ends in rooting hormone before inserting them into moist potting medium.

For division propagation, carefully dig up mature plants and gently separate the root clumps. Each division should have both roots and shoots. Replant immediately at the same depth they were originally growing.

More About Propagating Techniques→

How to Repot Fourpetal St. John's wort plant?

Repotting frequency: Every 2-3 years

Hypericum tetrapetalum should be repotted when you notice roots emerging from the drainage holes or when the plant seems stunted in growth. These signs typically indicate that the roots have outgrown the current pot, and it's time to give them more space to flourish. Spring and autumn are ideal times to undertake this task as the weather is mild, minimizing plant stress.

When selecting a pot for Hypericum tetrapetalum, aim for one that is only slightly larger than the current pot, ideally 1-2 inches wider in diameter. Opt for a pot with drainage holes to prevent waterlogged soil. The materials of the pot, such as clay or ceramic, can aid in better aeration for the roots. Choosing the right pot size ensures the plant will not grow excessively large, maintaining its bushy, compact form.

For repotting Hypericum tetrapetalum, use a well-draining neutral soil. You can enhance regular potting mix with perlite or sand to ensure excellent drainage and prevent root rot. This soil environment provides the right balance of moisture retention and air circulation, allowing roots to breathe and absorb nutrients efficiently, leading to a healthier, more vibrant plant.

Toxicity

Ingestion, skin contact in large quantities

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.