Silverleaf Scorpionweed (Phacelia hastata)

Also known as: White-Leaf Phacelia, Timberline Silverleaf Phacelia

The Silverleaf Scorpionweed is a perennial herb native to western North America. Its flowers are particularly eye-catching due to their vibrant purple hue and bell-shaped structure. These small blooms are arranged in dense, coiled clusters, and feature long stamens that extend well beyond the petals, giving them a unique, fuzzy look. The plant's foliage forms tufts at the base, providing a striking contrast with its silvery-green, finely divided leaves.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Silverleaf Scorpionweed

Lifespan

Perennial

Plant Type

Herb

Plant Height

15 cm to 91 cm

Spread

30 cm

Leaf Color

Green Blue Bronze

Flower Size

6 mm

Flower Color

Purple White Yellow Green

Images of Silverleaf Scorpionweed

Quickly Identify Silverleaf Scorpionweed

Phacelia hastata can be identified by its silvery-green leaves covered in fine hairs, giving them a grayish appearance. Its flowers are small, clustered, and typically light blue or lavender in color.

Scientific Classification of Silverleaf Scorpionweed

Phylum

Vascular plants

Class

Dicotyledons

Order

Boraginales

Family

Waterleaf

Genus

Heliotrope

Species

Silverleaf Scorpionweed

Planting and Growing of Silverleaf Scorpionweed

Care Difficulty

Easy

Watering Schedule

Every 2 days

Sunlight Requirements

Full sun

Sunshine Duration

4-8 hours

Ideal Temperature

55-75℉

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 Silverleaf Scorpionweed?

Phacelia hastata prefers soil that is kept slightly moist but not waterlogged. Each watering should deliver about 250 ml of water to ensure the soil remains adequately moist. It's crucial to water thoroughly until you see water draining out the bottom of the pot, which indicates that the moisture has reached the roots. Ensure the top layer of soil dries out between watering to avoid root rot.

What are the symptoms of an underwatered Silverleaf Scorpionweed? ›

What should I do if my Silverleaf Scorpionweed is not getting enough water? ›

What are the symptoms of an overwatered Silverleaf Scorpionweed? ›

How to save an overwatered Silverleaf Scorpionweed? ›

What Are the Sunlight Requirements for Silverleaf Scorpionweed?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours

Phacelia hastata prefers full sun or partial sun conditions, ideally for about six to eight hours a day. Proper light exposure enhances flowering and promotes vigorous growth.

Understanding Sunlight Needs ›

Creating Ideal Conditions ›

Benefits of Proper Lighting ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Silverleaf Scorpionweed?

Ideal Temperature: 55 ~ 75℉

Phacelia hastata thrives in temperatures between 55°F and 75°F. This range enables optimal enzyme function and nutrient uptake, leading to vigorous growth and vibrant blooms. Maintaining these conditions in a controlled environment can maximize the plant's potential.

What Soil is Best for Silverleaf Scorpionweed?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Phacelia hastata thrives in well-drained soils that prevent root rot and other moisture-related issues, ensuring healthy growth and abundant flowering. This plant prefers soils with moderate fertility. Excessive nutrients can lead to lush foliage with reduced flowering. The ability to tolerate slightly alkaline soils (up to pH 7.5) allows for flexibility in planting locations, making it versatile for various garden settings.

How to Fertilize Silverleaf Scorpionweed?

Fertilizer type: Balanced

For Phacelia hastata, using a balanced 10-10-10 liquid fertilizer at half-strength is recommended. Each application should consist of no more than 200 milliliters per plant. Ensure even distribution to avoid any nutrient burn issues.

How to Prune Silverleaf Scorpionweed?

Pruning Time: Spring, Summer, Autumn

Begin by carefully inspecting the plant to identify any dead, damaged, or diseased stems. These parts should be removed first to prevent the spread of disease and to invigorate healthy growth. Trim back about one-third of the older growth to promote new blooms. Cut just above a leaf node, which is crucial to encourage branching and a fuller plant appearance. Avoid cutting too close to the nodes to prevent stress. After completing the trimming, step back and assess the overall shape and balance of the plant. Make minor adjustments if necessary to ensure symmetry and even growth across the plant. More About Pruning Techniques→

How to Propagate Silverleaf Scorpionweed plant?

Propagate Time: Spring, Early spring, Late spring

Prepare a well-draining potting mix by combining equal parts of peat moss and perlite. This mixture allows for proper air circulation and root development for Phacelia hastata seeds.

Sow the seeds thinly across the surface of the prepared soil. Cover them lightly with a thin layer of soil or vermiculite to retain moisture and encourage germination.

Water the seeds gently using a spray bottle to avoid displacing them. Keep the soil consistently moist, but be careful not to overwater, which could lead to rot.

How to Repot Silverleaf Scorpionweed plant?

Repotting frequency: Every one to two years

Repot Phacelia hastata when its roots grow out through the drainage holes, or if the plant appears stunted or top-heavy. These signals indicate that the plant requires more space to grow robustly. Opt for repotting in early spring or mid-summer, as these seasons encourage optimal growth.

Choose a pot that is one to two sizes larger than the current one, with ample drainage holes to allow excess water to escape. Using a well-sized pot improves aeration and prevents waterlogging, ensuring that the root system develops healthily without suffering from root rot.

Select a well-drained sandy soil mix enriched with organic matter. This blend ensures good air circulation around the roots while providing the necessary nutrients. The soil's capacity to hold moisture without being soggy is crucial for Phacelia hastata's health.