Pacific hemlockparsley (Conioselinum gmelinii)

Also known as: Shiny-leaf Cow Parsnip, Gmelin's Hemlock-parsley

Pacific hemlockparsley, or Conioselinum pacificum, is a robust perennial herb native to coastal North America. It stands 1-3 feet tall, featuring finely divided, fern-like foliage and producing small white flowers in umbrella-shaped clusters during summer, similar to other members of the carrot family.

Preferred growing conditions:
- **Climate:** Cool, moist environments, typically coastal.
- **Soil:** Prefers well-drained, sandy or loamy soils rich in organic matter.
- **Sunlight:** Thrives in partial to full sun.
- **Water:** Requires regular watering to keep the soil consistently moist.

Often found in meadows, wetlands, and along stream banks, Pacific hemlockparsley is adapted to cooler climates and is frost-resistant, making it a resilient part of its ecosystem and an important plant for supporting pollinators.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Pacific hemlockparsley

Lifespan

Perennial

Plant Type

Herb

Plant Height

60-120 cm (24-47 inches)

Spread

Approximately 20-30 cm (8-12 inches)

Leaf Color

Green

Flower Size

0.3-0.5 cm (0.12-0.2 inches)

Flower Color

White

Images of Pacific hemlockparsley

Quickly Identify Pacific hemlockparsley

Look for tall, smooth, and hollow stems; leaves that are divided into many fine lobes; and small, white, umbrella-shaped flower clusters.

Scientific Classification of Pacific hemlockparsley

Phylum

Vascular plants

Class

Dicotyledons

Order

Apiales

Family

Umbellifers

Genus

Hemlock-parsleys

Species

Pacific hemlockparsley

Planting and Growing of Pacific hemlockparsley

Care Difficulty

Moderate

Watering Schedule

Every 2 days

Sunlight Requirements

Partial sun

Sunshine Duration

4-8 hours

Ideal Temperature

60-70℉

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

Once a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Pacific hemlockparsley?

For Conioselinum gmelinii, aim to water with about 500 ml each time, ensuring the soil is evenly moist but not waterlogged. The soil should feel damp to the touch but not soggy, allowing for proper air circulation around the roots.

What are the symptoms of an underwatered Pacific hemlockparsley? ›

What should I do if my Pacific hemlockparsley is not getting enough water? ›

What are the symptoms of an overwatered Pacific hemlockparsley? ›

How to save an overwatered Pacific hemlockparsley? ›

What Are the Sunlight Requirements for Pacific hemlockparsley?

Sunlight Requirements: Partial sun

Duration of light: 3-6 hours sunshine

Partial sun exposure is ideal for Conioselinum gmelinii, ensuring it gains maximum health benefits such as stronger stems, healthy foliage, and full growth potential through balanced sun-shade interaction.

What kind of light does Conioselinum gmelinii prefer? ›

How can you ensure Conioselinum gmelinii gets its ideal light? ›

What are the benefits of ideal light for Conioselinum gmelinii? ›

What Is the Ideal Temperature Range for Pacific hemlockparsley?

Ideal Temperature: 60 ~ 70℉

The ideal temperature range for Conioselinum gmelinii is typically between 60°F and 70°F. Maintaining this temperature range supports optimal growth and promotes healthy development, ensuring that the plant thrives in its environment. These conditions mimic its natural habitat, providing the warmth without excessive heat that the plant needs.

What Soil is Best for Pacific hemlockparsley?

Soil type: Loam, Sandy loam, Clay soil

Soil PH: 6.5 ~ 7.5

Conioselinum gmelinii thrives in nutrient-rich soil, which boosts the plant's growth and produces vibrant foliage. This type of soil ensures that the plant has access to essential nutrients for its development. This plant requires well-drained soil to prevent root rot and other water-related issues. Proper drainage ensures the plant's roots remain healthy and able to absorb necessary nutrients efficiently. While drainage is crucial, the soil must also retain adequate moisture to sustain the plant between waterings. This balance prevents the plant from drying out and supports continuous growth.

How to Fertilize Pacific hemlockparsley?

Fertilizer type: Balanced

For Conioselinum gmelinii, apply 1/2 teaspoon of liquid fertilizer per gallon of water. This concentration ensures the plant receives adequate nutrients without risking over-fertilization, promoting healthy growth and vibrant foliage.

How to Prune Pacific hemlockparsley?

Pruning Time: Spring, Summer, Autumn

Start by removing any dead, damaged, or diseased stems as they appear. Use sharp, clean tools to make precise cuts just above a set of healthy leaves or a node. This encourages the plant to produce new, vigorous growth. To maintain an attractive shape, selectively prune back the outer stems of Conioselinum gmelinii. This helps the plant to grow more densely but ensure not to remove more than one-third of its total growth at once to prevent stress. More About Pruning Techniques→

How to Propagate Pacific hemlockparsley plant?

Propagate Time: Spring, Early spring

Collect seeds from mature Conioselinum gmelinii plants just as they start to dry out. Store them in a cool, dry place until ready to plant in early spring.

Prepare seed beds by loosening the soil and removing any weeds or debris. This ensures that the seeds have a clean environment to grow in and enhances germination rates.

Sow seeds thinly and cover them lightly with soil. Water gently to avoid washing the seeds away. Keep them consistently moist until germination occurs.

More About Propagating Techniques→

How to Repot Pacific hemlockparsley plant?

Repotting frequency: Every 2-3 years

Conioselinum gmelinii shows signs of needing repotting when its roots start to circle the pot or emerge from the drainage holes. Additionally, if you notice the growth rate slowing despite optimal conditions, it may be time to consider repotting. Ideally, aim for repotting during spring or early summer when the plant is in its active growth phase. This timing allows the plant to recover more quickly and adapt to its new environment.

Select a pot that is only slightly larger than the current one. This helps avoid the risk of root rot from excessive soil moisture. Ensure the new pot has adequate drainage holes to promote healthy airflow and prevent waterlogging. Using a breathable material such as terracotta can further help manage moisture levels, keeping your Conioselinum gmelinii thriving.

Opt for a well-draining loamy mix, which provides the perfect balance of nutrients and moisture retention for Conioselinum gmelinii. A mix that includes components like perlite or coarse sand can enhance drainage. This soil ensures the roots receive enough oxygen, preventing root rot and encouraging robust plant growth.