White-stem globemallow (Sphaeralcea munroana)

Also known as: Munroe's desert-mallow

The white-stem globemallow (Iliamna rivularis) is a perennial herb belonging to the mallow family. It is distinguished by its white to pale pink flowers and white, hairy stems. The plant typically reaches heights of 2-5 feet and features palmately lobed leaves. It thrives in moist, well-drained soils and is commonly found in mountainous regions, meadows, and along stream banks in the western United States and Canada. The white-stem globemallow prefers full sun to partial shade.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of White-stem globemallow

Lifespan

Perennial

Plant Type

Herb, Shrub

Plant Height

61 cm to 91 cm

Spread

45 cm to 60 cm

Leaf Color

White Red

Flower Size

1 to 2 inches (2.5 to 5 cm)

Flower Color

Red Orange

Images of White-stem globemallow

Quickly Identify White-stem globemallow

Identify Sphaeralcea munroana by its deeply lobed, grayish-green leaves covered in fine hairs, and its vibrant, five-petaled flowers that range in color from orange to red. The plant has a bushy appearance and can be found in arid regions.

Scientific Classification of White-stem globemallow

Phylum

Vascular plants

Class

Dicotyledons

Order

Malvales

Family

Mallow

Genus

Globe mallows

Species

White-stem globemallow

Planting and Growing of White-stem globemallow

Care Difficulty

Easy

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

70-85℉

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 White-stem globemallow?

When watering Sphaeralcea munroana, aim to ensure that the soil is evenly moist but not waterlogged. A good rule of thumb is to water until around 500 ml has been absorbed by the soil. This amount will typically allow the entire root ball to receive moisture, promoting healthy growth without drowning the plant.

What are the symptoms of an underwatered White-stem globemallow? ›

What should I do if my White-stem globemallow is not getting enough water? ›

What are the symptoms of an overwatered White-stem globemallow? ›

How to save an overwatered White-stem globemallow? ›

What Are the Sunlight Requirements for White-stem globemallow?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours

Sphaeralcea munroana requires full sun to partial sun, with 6 to 8 hours of light preferred. Ideal sunlight exposure improves blooming and strengthens the plant's structural integrity.

How much sunlight does Sphaeralcea munroana need? ›

Can it tolerate partial sunlight? ›

What should you do if full sun isn't available? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for White-stem globemallow?

Ideal Temperature: 70 ~ 85℉

For optimal growth, Sphaeralcea munroana thrives in a temperature range of 70°F to 85°F. This range provides the perfect balance of warmth needed for its physiological processes, including photosynthesis and nutrient absorption. Maintaining this temperature ensures healthy foliage and vibrant blooms.

What Soil is Best for White-stem globemallow?

Soil type: Sandy soil, Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Sphaeralcea munroana thrives in well-drained soil, which prevents waterlogging and root rot. Good drainage ensures that the roots receive adequate oxygen, promoting healthy growth and vibrant flowers. This plant prefers soil with moderate fertility. Overly rich soil can lead to weak, leggy growth, whereas moderate nutrients support a robust structure and prolific blooming. A sandy soil composition mirrors its natural habitat, providing ideal conditions for root expansion and accessibility to nutrients. Such soil warms up quickly, encouraging early spring growth.

How to Fertilize White-stem globemallow?

Fertilizer type: Balanced

When fertilizing Sphaeralcea munroana, opt for a balanced 10-10-10 liquid fertilizer. Dilute the liquid fertilizer to half strength to avoid overwhelming the plant. Each plant typically requires about 2 tablespoons (30 ml) of diluted fertilizer per application.

How to Prune White-stem globemallow?

Pruning Time: Spring, Summer

Focus on removing dead, damaged, or diseased stems. This encourages new growth and improves air circulation, keeping the plant healthy and vigorous. Cut back overly long stems to maintain an appealing and balanced shape. This ensures the plant remains compact, enhancing its aesthetic appeal in your garden. Pinch back growing tips throughout the growing season to encourage bushier growth. This simple technique leads to a fuller, more robust plant. More About Pruning Techniques→

How to Propagate White-stem globemallow plant?

Propagate Time: Spring, Early summer, Early autumn

Start by collecting seeds from mature plants and soaking them in water for 24 hours. This helps in breaking dormancy and speeding up germination. Sow the seeds in trays filled with a seed-starting mix.

Use clean pruning shears to cut 4-6 inch sections of a healthy stem. Remove the lower leaves to expose nodes, as this is where roots will develop.

Carefully dig up mature clumps in early spring. Use a clean knife or spade to divide the root ball. Each division should have part of the root system and a few stems.

More About Propagating Techniques→

How to Repot White-stem globemallow plant?

Repotting frequency: Every 2-3 years

Repot Sphaeralcea munroana when you notice it's becoming root-bound, indicated by roots protruding from the pot's drainage holes. Another sign is when water can't penetrate the pot easily, leading to water pooling on the surface.

Select a pot with drainage holes that is 1-2 inches wider than the current one. This size ensures the roots have enough space to grow freely while preventing overwatering, as excess water can easily escape through the holes.

Opt for a well-draining sandy loam mix. This type of soil provides excellent aeration and prevents waterlogging, which is crucial for avoiding root rot in Sphaeralcea munroana, ensuring its long-term health and vibrancy.