Streambank wild hollyhock (Iliamna rivularis)

Also known as: Streambank Globemallow, Mountain Hollyhock

Streambank wild hollyhock (Iliamna rivularis) thrives in mountainous regions, typically found along streams and on forested slopes, as well as in disturbed sites. It prefers moist, well-drained soils and can grow between 91 to 183 cm tall. This plant features tall spikes of white, pink, or purple flowers that attract pollinators like bees, butterflies, and birds. Note that its brown berries may be toxic to children.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Streambank wild hollyhock

Lifespan

Perennial

Plant Type

Herb, Shrub

Plant Height

91 cm to 1.8 m

Spread

90 cm to 1.8 m

Leaf Color

Deep green

Flower Size

8 cm to 10 cm

Flower Color

Pink White Lavender

Images of Streambank wild hollyhock

Quickly Identify Streambank wild hollyhock

The plant can be identified by its large, palmate leaves that are deep green and hairy. The flowers are cup-shaped and come in shades of pink, lavender, or white, with each flower having five petals. The plant usually grows in clumps and can reach heights of up to 6 feet.

Scientific Classification of Streambank wild hollyhock

Phylum

Vascular plants

Class

Dicotyledons

Order

Malvales

Family

Mallow

Genus

Wild hollyhocks

Species

Streambank wild hollyhock

Planting and Growing of Streambank wild hollyhock

Care Difficulty

Easy

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 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

Ceramic, Plastic

How to Water Streambank wild hollyhock?

Iliamna rivularis requires a moderate watering regime, with each watering session delivering around 500 ml of water directly to the roots. This ensures the soil remains consistently moist but not waterlogged, promoting healthy growth.

What are the symptoms of an underwatered Streambank wild hollyhock? ›

What should I do if my Streambank wild hollyhock is not getting enough water? ›

What are the symptoms of an overwatered Streambank wild hollyhock? ›

How to save an overwatered Streambank wild hollyhock? ›

What Are the Sunlight Requirements for Streambank wild hollyhock?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours daily

Iliamna rivularis thrives with 6 to 8 hours of sunlight. This range supports optimal photosynthesis, promoting healthy growth and vibrant blooms.

What is the best location for Iliamna rivularis? ›

How can you ensure Iliamna rivularis gets enough sunlight? ›

Why is proper sunlight important for Iliamna rivularis? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Streambank wild hollyhock?

Ideal Temperature: 65 ~ 75℉

The ideal temperature range for Iliamna rivularis is between 65°F and 75°F. This range provides optimal conditions for growth and flowering, ensuring healthy development and vibrant blooms. Maintaining this range will help the plant in carrying out essential physiological processes efficiently.

What Soil is Best for Streambank wild hollyhock?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Iliamna rivularis thrives in well-draining soil, which prevents root rot by allowing excess water to escape easily. This ensures healthy root growth and reduces stress on the plant, promoting robust development. Rich in organic matter, nutrient-rich soil supports the vigorous growth of Iliamna rivularis by providing essential nutrients. This encourages lush foliage and vibrant flowering, making your garden a visually appealing space. The ability to retain moisture without becoming waterlogged is crucial. It ensures Iliamna rivularis receives a constant water supply, particularly during dry spells, supporting its overall health and flowering potential.

How to Fertilize Streambank wild hollyhock?

Fertilizer type: Balanced

For Iliamna rivularis, it's important to avoid over-fertilization as it's a relatively low-maintenance plant. Use a balanced liquid fertilizer at half the strength recommended on the label, typically around 1 tablespoon per gallon of water. For slow-release fertilizers, 1.5 ounces per plant distributed evenly around the base is adequate.

How to Prune Streambank wild hollyhock?

Pruning Time: Spring, Summer, Autumn

Iliamna rivularis tends to grow outward from its base. Start pruning the oldest and woodiest stems that are close to the ground. This will encourage new growth from the base and maintain the plant's natural bushy shape. By thinning out the central stems and branches, you help improve air circulation within the plant. This is crucial in preventing mildew and other fungal diseases. A well-ventilated plant dries quicker after rain and reduces humidity around foliage. More About Pruning Techniques→

How to Propagate Streambank wild hollyhock plant?

Propagate Time: Spring, Early spring

Use a well-draining soil mix composed of equal parts of potting soil, coarse sand, and perlite to promote root growth and prevent damping off.

Sow the seeds thinly on the surface of the soil mix, ensuring they are evenly spread. Cover them with a fine layer of soil to protect from direct sunlight.

Gentle watering using a spray bottle helps maintain moisture without disturbing the seeds or seedlings. Ensure consistent moisture without overwatering.

More About Propagating Techniques→

How to Repot Streambank wild hollyhock plant?

Repotting frequency: Every 2-3 years

Iliamna rivularis needs repotting when its roots protrude through the drainage holes or when growth appears stunted despite adequate care. Another signal is the soil drying out very rapidly. Ideally, repotting should occur when the plant shows signs of outgrowing its current container.

Select a pot that is slightly larger than the current one, with ample drainage holes. A pot too large can cause moisture retention issues, while one too small stunts growth. Terracotta pots work well as they allow the soil to breathe, which prevents overwatering.

Opt for well-draining loamy soil that is rich in organic matter. This ensures that the plant receives adequate nutrients while ensuring excess water drains effectively, preventing root rot—a common issue with underperforming soils.