Pelargonium grandiflorum (Pelargonium grandiflorum)

Also known as: Regal Geranium, Martha Washington Geranium

Rhododendrons are striking perennials celebrated for their large, colorful blooms that often resemble azaleas. These flowers come in a variety of shades, from white to deep red, and are framed by lush, green leaves. Rhododendrons thrive in temperate climates and are a favorite among gardeners due to their ability to attract pollinators. They flourish best in well-drained soil with full to partial sunlight, making them a hallmark of garden beauty and horticultural appeal.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Pelargonium grandiflorum

Lifespan

Perennial

Plant Type

Herb

Plant Height

30 cm

Spread

20 cm

Leaf Color

Green

Flower Size

2-3 inches (5-7.6 cm)

Flower Color

Pink, Red, Purple, White

Images of Pelargonium grandiflorum

Quickly Identify Pelargonium grandiflorum

Identifying Pelargonium grandiflorum involves looking for its large, showy flowers that typically come in shades of pink, red, purple, or white. The leaves are often deeply lobed and have a somewhat crinkly texture. They emit a distinct fragrance when crushed.

Scientific Classification of Pelargonium grandiflorum

Phylum

Vascular plants

Class

Dicotyledons

Order

Geraniums, bridal wreaths, and allies

Family

Geranium

Genus

Pelargoniums

Species

Pelargonium grandiflorum

Planting and Growing of Pelargonium grandiflorum

Care Difficulty

Moderate

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 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 Pelargonium grandiflorum?

Pelargonium grandiflorum requires a careful balance when it comes to watering. You should ensure the soil is moist, but not soggy. Each time you water, aim for about 300 milliliters, enough to saturate the roots without causing water to pool on the surface.

What are the symptoms of an underwatered Pelargonium grandiflorum? ›

What should I do if my Pelargonium grandiflorum is not getting enough water? ›

What are the symptoms of an overwatered Pelargonium grandiflorum? ›

How to save an overwatered Pelargonium grandiflorum? ›

What Are the Sunlight Requirements for Pelargonium grandiflorum?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 4 to 6 hours daily

This plant prefers a mix of full and partial sunlight, ideally basking in direct light for about 4 to 6 hours daily. Such light conditions foster enhanced blooms and robust growth, creating a stunning floral display.

How much sunlight does it need? ›

What solutions ensure ideal lighting? ›

What are the benefits of ideal lighting? ›

What Is the Ideal Temperature Range for Pelargonium grandiflorum?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for Pelargonium grandiflorum lies between 60°F and 75°F. This range provides a perfect balance of warmth and comfort, ensuring that the plant can perform its photosynthetic activities optimally. Keeping the temperature within this range helps prevent physiological stress and supports vigorous growth and blooming.

What Soil is Best for Pelargonium grandiflorum?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Pelargonium grandiflorum thrives in well-draining soils that prevent waterlogging, which can lead to root rot. The benefit of such soil is that it maintains ideal moisture levels, supporting healthy root and plant growth. Crane's Bill loves nutrient-rich soils that offer a balanced diet of essential macro and micronutrients. This nutrient abundance enhances its vibrant flowering and robust foliage, making for a spectacular garden display. A moderate level of organic matter in the soil not only improves aeration but also sustains long-term fertility. This continuous nutrient supply helps Pelargonium grandiflorum to bloom over extended periods.

How to Fertilize Pelargonium grandiflorum?

Fertilizer type: Balanced

For Pelargonium grandiflorum, a balanced fertilizer with an NPK ratio of 10-10-10 is ideal. Apply approximately 1 tablespoon of liquid fertilizer per gallon of water or follow the manufacturer's instructions. Ensure the soil is moist before applying to avoid root burn.

How to Prune Pelargonium grandiflorum?

Pruning Time: Spring, Autumn

Snip just above a leaf node to encourage branching. Make clean, angled cuts to promote healing and avoid damaging the plant. This technique helps your Pelargonium grandiflorum become bushier and more resilient. For plants that have grown too leggy or unshapely, cut back to desired length each month during the growing seasons. This practice ensures controlled growth, better air circulation, and an aesthetically pleasing shape. More About Pruning Techniques→

How to Propagate Pelargonium grandiflorum plant?

Propagate Time: Spring, Early summer

Choose healthy, non-flowering shoots that are approximately 4 to 6 inches in length. Ensure that the selected stems show no signs of disease or insect infestation to maximize healthy root growth.

Remove any lower leaves from the stem to leave about two or three leaves at the top. This prevents leaf decay when the cutting is inserted into the soil or rooting medium, encouraging root development.

Dip the cut end of the stem into rooting hormone, tap off the excess, and plant it in a pot with sterile, well-draining potting mix. Firm the soil around the base of the cutting.

More About Propagating Techniques→

How to Repot Pelargonium grandiflorum plant?

Repotting frequency: Every two years

Pelargonium grandiflorum needs repotting when its growth appears stunted, or you notice roots protruding from the drainage holes. Another signal is the soil's poor drainage even with regular watering. These indicators suggest that the plant has outgrown its current home and requires a new pot with fresh soil to thrive.

Opt for a pot that is one to two inches larger in diameter than the current one. This gradual increase allows room for root growth while preventing excessive soil retention, which can lead to root rot. Ensure the pot has adequate drainage holes to facilitate healthy water movement and avoid waterlogging.

The ideal soil for repotting is a well-draining potting mix. A combination of peat, perlite, and sand creates a balance that retains moisture yet drains excess water effectively. This type of soil promotes healthy root development by preventing water accumulation and providing essential aeration.

Toxicity

Ingestion or physical contact with sap.

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.