Zonal geranium (Pelargonium hortorum)

Also known as: Scarlet geranium, Fish geranium

Zonal geraniums (Pelargonium hortorum) are annual plants that can be easily identified by a distinctive dark band or "zone" across the middle of their leaves, which can be red, blue, or purple. Unlike some geraniums that are perennials and bloom year-round, zonal geraniums typically bloom for just one season. Their flowers come in a wide array of colors, such as red, pink, burgundy, salmon, and white.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Zonal geranium

Lifespan

Perennial, Annual

Plant Type

Herb

Plant Height

10 cm to 50 cm

Spread

10 cm to 50 cm

Leaf Color

Green

Flower Size

3 cm to 4 cm

Flower Color

Pink Purple Red White

Images of Zonal geranium

Quickly Identify Zonal geranium

Garden geraniums can be identified by their round, lobed leaves which often have a dark circular mark or 'zone' on the upper surface. The flowers come in a variety of colors, including red, pink, white, and violet, and they grow in clusters at the top of the stems.

Scientific Classification of Zonal geranium

Phylum

Vascular plants

Class

Dicotyledons

Order

Geraniums, bridal wreaths, and allies

Family

Geranium

Genus

Pelargoniums

Species

Zonal geranium

Planting and Growing of Zonal geranium

Care Difficulty

Easy

Watering Schedule

Every 4 days

Sunlight Requirements

Full sun

Sunshine Duration

4-6 hours

Ideal Temperature

65-75℉

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 Zonal geranium?

When watering Pelargonium hortorum, aim to keep the soil evenly moist but not waterlogged. Use approximately 250 ml of water per session. Ensure the water penetrates deeply into the soil, reaching the root zone for optimal absorption. Let the top inch of soil dry out between watering sessions for the healthiest plant growth.

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What Are the Sunlight Requirements for Zonal geranium?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours

Pelargonium hortorum ideally requires full sun to partial sun exposure, benefiting from prolonged light periods. This ensures robust growth, vibrant flowering, and healthier plant physiology by maximizing photosynthetic efficiency.

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What Is the Ideal Temperature Range for Zonal geranium?

Ideal Temperature: 65 ~ 75℉

The ideal temperature range for the optimal growth of Pelargonium hortorum is between 65 and 75°F. Within this range, the plant experiences optimal metabolic functions, photosynthesis rates, and overall growth. Maintaining temperatures within this range ensures robust flowering and healthy foliage, providing the most vibrant flowering displays throughout the growing season.

What Soil is Best for Zonal geranium?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Pelargonium hortorum prefers soil that drains well to prevent waterlogging, which can lead to root rot. Well-drained soil ensures that the roots receive adequate oxygen, promoting healthy growth. Having a nutrient-rich soil is crucial for Pelargonium hortorum as it supports robust flowering and vibrant foliage. Incorporating organic matter like compost can enhance soil fertility and structure, benefiting the plant’s overall health. This plant thrives in soil with moderate moisture levels. Soil that is too dry may lead to wilting, while overly wet conditions can promote fungal diseases. Thus, balanced moisture helps in maintaining turgor and vitality. More About Soil→

How to Fertilize Zonal geranium?

Fertilizer type: Balanced

When fertilizing Pelargonium hortorum, it's crucial to strike a balance. For liquid fertilizers, use a balanced 10-10-10 formula, diluted to half strength, applying approximately half a gallon per plant. For solid fertilizers, use approximately 1 tablespoon per square foot of soil surface, ensuring even distribution. More About Fertilizing Techniques→

How to Prune Zonal geranium?

Pruning Time: Spring, Summer, Autumn

Start by inspecting your Pelargonium hortorum for any dead or diseased stems. Cut these back to healthy tissue. Then, trim back any overly long stems to maintain a balanced shape. Aim to make cuts just above a node to encourage bushier growth. To promote bushier growth and more blooms, pinch back the growing tips of stems. This encourages the plant to produce more lateral shoots, resulting in a fuller appearance with increased flowering. Regular pinching can be done throughout the spring and summer months. More About Pruning Techniques→

How to Propagate Zonal geranium plant?

Propagate Time: Spring,Early spring

Use a sharp knife to cut 4-6 inch sections from healthy stems. Ensure each cutting has a few leaves at the top and remove those at the bottom to expose nodes for rooting.

Insert the cuttings into a pot with a well-draining soil mix. Ensure the nodes are buried to encourage root development. Water lightly and cover with a plastic bag to retain moisture.

Sow seeds in a tray filled with seed-starting compost. Cover lightly with soil, water gently, and place in a warm, bright location. Keep the soil consistently moist but not waterlogged.

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How to Repot Zonal geranium plant?

Repotting frequency: Every 1-2 years

Pelargonium hortorum, or the garden geranium, shows signals like roots protruding through drainage holes or soil drying too quickly, indicating it requires repotting. These signs suggest that your plant may be root-bound and requires a new container.

Opt for a pot about 1-2 inches larger in diameter than the old one. It should have drainage holes to prevent waterlogging, which can lead to root rot. A slightly larger pot provides room for growth without risking excessive soil moisture retention.

Choose a well-draining potting mix with ample aeration, such as a blend of peat, perlite, and sand. This type of soil ensures proper drainage and root aeration, preventing waterlogging and providing the perfect nutrition for your geranium.

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Toxicity of Zonal geranium

Is Zonal geranium toxic to humans?

The zonal geranium, belonging to the *Pelargonium* genus, should always be treated with caution. Depending on individual skin sensitivity and the extent of contact, handling any part of the plant might lead to contact dermatitis. *Pelargoniums* contain harmful terpenes such as geraniol and linalool, which are known to irritate tissues and can result in severe complications for most animals that ingest any portion of this plant. It is essential to keep this plant away from small children and other vulnerable individuals. Poisoning symptoms may include digestive disturbances, appetite loss, vomiting, diarrhea, colic, lethargy, and weakness.

Is Zonal geranium toxic to cat?

Zonal geranium is recognized as toxic to cats, presenting a risk if any part is ingested. Ingestion may result in poisoning, and affected cats can show signs of physical distress such as vomiting or diarrhea. Pet owners need to be aware of these potential health risks and should closely observe their cats for any illness signs if they have access to zonal geranium. Should a cat exhibit symptoms of poisoning, it is crucial to seek prompt veterinary assistance to guarantee the best possible recovery.

Is Zonal geranium toxic to dog?

Zonal geranium is recognized as a toxic plant for dogs. Canines may inadvertently consume different parts of this plant, resulting in poisoning. Every aspect of zonal geranium is deemed harmful and can present a threat if ingested by dogs. Signs of toxicity in dogs may manifest as vomiting, diarrhea, lethargy, reduced appetite, and overall depression. It is vital for dog owners to remain alert and ensure their pets do not have access to or ingest any part of the zonal geranium. Should a dog happen to eat any part of zonal geranium, it is important to seek prompt veterinary assistance to secure the best potential outcome for the affected 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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