Bastard guelder (Premna serratifolia)

Also known as: Headache tree, Arni, Aghada, False prantaa, Kharvik

The Bastard guelder (Premna serratifolia) is a tropical shrub with glossy dark green leaves, frequently seen in parks and gardens. During its flowering season, it attracts a variety of pollinators, including bees, butterflies, and beetles. Notably, Emerald Sweat Bees are among the insects drawn to its nectar and pollen.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Bastard guelder

Lifespan

Perennial

Plant Type

Tree, Shrub

Plant Height

7 m

Spread

2 to 4 meters

Leaf Color

Green

Flower Size

2.5 cm to 4.5 cm

Flower Color

White Green

Images of Bastard guelder

Quickly Identify Bastard guelder

The tree can be identified by its serrated leaves, which are oval to ovate in shape and have a rough texture. The flowers are small, mostly white, and grow in clusters.

Scientific Classification of Bastard guelder

Phylum

Vascular plants

Class

Dicotyledons

Order

Lamiales

Family

Mint

Genus

Premna

Species

Bastard guelder

Planting and Growing of Bastard guelder

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

68-86℉

Soil Type

Potting Mix, Peat Mix

Soil pH

5.5-7.5

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 Bastard guelder?

When watering Premna serratifolia, ensure the soil is evenly moist but not waterlogged. The top inch of soil should dry out between waterings to prevent root rot. This strategy helps maintain consistent moisture levels without over-saturation.

What are the symptoms of an underwatered Bastard guelder? ›

What should I do if my Bastard guelder is not getting enough water? ›

What are the symptoms of an overwatered Bastard guelder? ›

How to save an overwatered Bastard guelder? ›

What Are the Sunlight Requirements for Bastard guelder?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 4-8 hours daily

Premna serratifolia's ideal light range is partial to full sunlight. The benefit of providing this range ensures adequate energy for photosynthesis, thereby promoting strong growth and vibrant coloring in foliage.

Question: What type of light does Premna serratifolia prefer? ›

Question: How to manage light exposure for Premna serratifolia in varied climates? ›

Question: What are the benefits of maintaining ideal light conditions for Premna serratifolia? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Bastard guelder?

Ideal Temperature: 68 ~ 86℉

The ideal temperature range for Premna serratifolia, also known as the Serrated-leaf Premna, is between 68°F and 86°F. This range provides the best conditions for its metabolic processes and physiological functions. Maintaining temperatures within this range ensures the plant achieves optimal growth, foliage density, and flowering potential.

What Soil is Best for Bastard guelder?

Soil type: Sandy soil, Sandy loam, Loam

Soil PH: 5.5 ~ 7.5

Premna serratifolia thrives in well-drained soils. A well-drained soil prevents waterlogging, which can lead to root rot, thus ensuring the health and vitality of the plant. The plant prefers nutrient-rich soils, which provide essential nutrients for growth. Rich soils help in promoting lush foliage and robust stems. Soils that retain moderate moisture are ideal. They ensure that the plant has consistent access to water, without stressing it from drought or excess moisture.

How to Fertilize Bastard guelder?

Fertilizer type: Balanced

Premna serratifolia generally requires moderate fertilization. For liquid fertilizers, a diluted solution at half the recommended strength is sufficient per feeding. With granular or slow-release fertilizers, apply about 1 ounce (28 grams) per square foot, ensuring it is well mixed into the soil.

How to Prune Bastard guelder?

Pruning Time: Spring, Summer, Autumn

To prune Premna serratifolia, you'll need a pair of sharp, sterilized pruning shears. Begin by inspecting the plant for any dead, damaged, or diseased branches. Cut these branches back to a healthy part of the plant or completely remove them if necessary. Focus on areas where branches cross over or crowd each other, which helps improve air circulation. Trim back any excessively long or unruly branches to maintain the plant's desired shape and encourage bushier growth. Remember to make clean cuts at a slight angle just above a leaf node to promote optimal healing. More About Pruning Techniques→

How to Propagate Bastard guelder plant?

Propagate Time: Spring, Early summer

Collect mature seeds from the plant, ideally when the pods have dried and started to crack open. Ensure that the seeds are fully ripe to increase germination success rates.

Select healthy stems and cut them to a length of about 6-8 inches. Remove the leaves from the lower half of the cutting to prevent rot and promote root development.

Sow seeds in a well-draining potting mix, lightly covering them with soil. Keep the soil consistently moist and place the tray in a warm, bright location.

More About Propagating Techniques→

How to Repot Bastard guelder plant?

Repotting frequency: Every 2-3 years

Premna serratifolia signals the need for repotting when its roots start circling the pot, growth seems stunted, or water drains through the pot unusually fast. These are clear signs that it's time to give its roots more space to expand.

Select a pot that is 1-2 inches larger in diameter than the current one. This prevents excessive moisture accumulation and offers the roots just enough room to grow. Ensure the pot has drainage holes to facilitate proper water dispersal, promoting healthier roots and reducing root rot risk.

Opt for a well-draining soil mix composed of peat, perlite, and a bit of sand. This combination allows adequate aeration and prevents waterlogging, ensuring the plant thrives. The ideal soil retains enough moisture for nutrient uptake while allowing excess to drain away efficiently.