How To Grow Clematis ‘Jackmanii’

Clematis ‘Jackmanii’ is a classic and enchanting flowering vine known for its deep purple, velvety blossoms and vigorous growth. Successfully cultivating this spectacular clematis variety requires attention to specific planting, care, and maintenance practices. In this detailed guide, we will explore step-by-step instructions to help you how to grow Clematis ‘Jackmanii’  and enjoy the beauty of Clematis ‘Jackmanii’ in your garden.

Botanical Name: Clematis ‘Jackmanii’

Common Name: Jackman’s Clematis

Family: Ranunculaceae

Genus: Clematis

Flower Colour: Deep purple

Blooming Time: Late spring to early fall

Grow and care for Clematis ‘Jackmanii’

Choosing the Right Location:

Clematis ‘Jackmanii’ thrives in a location that receives at least 6 hours of sunlight daily but benefits from having its roots shaded. Planting it near a small shrub or placing a layer of mulch around the base can help keep the roots cool. Ensure the chosen site provides good air circulation to prevent issues like powdery mildew.

Selecting the Ideal Soil:

The right soil conditions are crucial for the optimal growth of Clematis ‘Jackmanii.’ Aim for well-draining soil that is rich in organic matter. Incorporate compost into the soil before planting to enhance fertility and water retention. Clematis prefer slightly alkaline to neutral soil with a pH range of 6.5 to 7.5.

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Planting Clematis ‘Jackmanii’:

a. Digging the Hole: Dig a hole that is twice as wide and deep as the root ball. Ensure the crown of the plant (where the stems meet the roots) is planted at least 2 inches below the soil surface to promote strong root development.

b. Amending the Soil: Mix the removed soil with well-rotted compost or aged manure. Backfill the hole with the amended soil.

c. Watering: Water thoroughly after planting to settle the soil around the roots.

Providing Support for Climbing:

Clematis ‘Jackmanii’ is a climbing vine that requires support for optimal growth. Install a trellis, arbor, or other suitable structure near the plant at the time of planting. Alternatively, you can guide the plant to climb up an existing structure, such as a fence.

Watering and Moisture Management:

Clematis prefers consistently moist but not waterlogged soil. Water deeply during dry periods, especially during the growing season. Apply a layer of mulch around the base of the plant to retain moisture, suppress weeds, and keep the roots cool.

Fertilizing Routine:

a. Early Spring Feeding:

  • In early spring, as new growth begins, provide a balanced, all-purpose fertilizer.
  • Follow the recommended application rates on the fertilizer packaging.

b. Monthly Fertilization:

  • During the growing season (spring through early fall), feed Clematis ‘Jackmanii’ with a phosphorus-rich fertilizer to encourage flower production.
  • Apply fertilizer monthly, following the package instructions.

Pruning Techniques:

Proper pruning is essential to maintain a healthy and vibrant Clematis ‘Jackmanii.’ This variety falls into Pruning Group 3, which means it blooms on new wood. Follow these pruning guidelines:

a. Late Winter/Early Spring Pruning:

  • In late winter or early spring, cut the plant back to 12 to 18 inches above the ground. Remove any dead or weak stems.

b. Post-Bloom Pruning:

  • After the initial spring pruning, deadhead spent flowers throughout the growing season.
  • In late summer or early fall, trim the plant again to tidy its appearance and remove any diseased or damaged growth.

Dealing with Pests and Diseases:

Keep an eye out for common clematis pests, such as aphids and spider mites. Use insecticidal soap or neem oil to control infestations. Additionally, monitor for fungal diseases like powdery mildew and treat promptly with fungicides if necessary.


Clematis ‘Jackmanii’ can be propagated through several methods, including stem cuttings and layering. Here’s a step-by-step guide for each propagation technique:

1. Stem Cuttings:

Materials Needed:

  • Sharp pruning shears or scissors
  • Rooting hormone
  • Potting mix
  • Pots or containers
  • Plastic bags or a propagation tray


  • Selecting the Cutting: Choose a healthy, non-flowering stem from the parent plant. The cutting should be approximately 4-6 inches long and contain at least two leaf nodes.
  • Cutting Preparation: Use sharp pruning shears or scissors to make a clean cut just below a leaf node. Remove any flowers or buds from the cutting.
  • Applying Rooting Hormone: Dip the cut end of the stem into rooting hormone powder. This helps stimulate root development.
  • Planting the Cutting: Insert the treated end of the cutting into a small pot filled with a well-draining potting mix. Plant it deep enough to cover at least one leaf node.
  • Providing Optimal Conditions: Place the pot in a plastic bag or cover it with a plastic dome to create a humid environment. Keep the cutting in a warm, bright location with indirect sunlight.
  • Rooting Period:It may take several weeks for roots to develop. You can gently tug on the cutting after a few weeks to check for resistance, indicating the presence of roots.
  • Transplanting: Once the cutting has developed sufficient roots, transplant it into a larger pot or directly into the garden.

2. Layering:

Materials Needed:

  • Healthy, flexible stem
  • Potting mix
  • Small pots or containers
  • Garden stakes (optional)
  • Plastic bags or plastic wrap


  • Selecting the Stem: Identify a healthy, flexible stem from the parent plant that can be easily bent to the ground.
  • Bending and Preparing the Stem: Bend the selected stem gently towards the ground without breaking it. Make a small incision or scrape the bark where the stem contacts the soil. This helps encourage root development.
  • Securing the Stem: If necessary, use garden stakes or similar supports to secure the bent stem in contact with the soil.
  • Covering and Mulching: Cover the portion of the stem in contact with the soil with additional potting mix. Optionally, mulch the area with organic material to retain moisture.
  • Protective Covering: Cover the layered portion with plastic bags or plastic wrap to create a mini greenhouse effect.
  • Rooting Period: Roots should develop over several weeks to months. Check for root development by gently tugging on the stem.
  • Separation and Transplanting: Once the layered stem has developed sufficient roots, carefully separate it from the parent plant. Transplant the rooted stem into a pot or directly into the garden.

Tips for Success:

  • Timing: The best time to propagate Clematis ‘Jackmanii’ is in the early growing season when the plant is actively growing.
  • Soil Moisture: Maintain consistent soil moisture during the rooting period, ensuring it doesn’t dry out.
  • Humidity: Providing a humid environment for cuttings, especially if using the plastic bag method, enhances the chances of successful root development.
  • Rooting Hormone: While not strictly necessary, using a rooting hormone can significantly improve the success rate of both cutting and layering propagation.

Winter Care

Winter care for Clematis ‘Jackmanii’ is essential to ensure the plant’s health and encourage robust growth and abundant blooms in the following growing season. Here are some guidelines for winter care:

  • Mulching: Apply a thick layer of organic mulch around the base of the plant in late fall after the ground has frozen. This helps insulate the soil, retain moisture, and protect the roots from extreme temperature fluctuations.
  • Protecting the Base: Wrap the base of the Clematis with burlap or another protective material to shield it from harsh winter winds and prevent potential damage.
  • Pruning: Late winter or early spring is the ideal time for pruning Clematis ‘Jackmanii.’ Prune back the plant to about 12 to 18 inches above the ground, removing any dead or weak stems. This encourages vigorous new growth in the coming season.
  • Frost Protection: If a late spring frost is expected after new growth has emerged, consider covering the plant with a breathable fabric or burlap overnight to protect delicate buds and young shoots.
  • Avoiding Waterlogged Soil: Ensure proper drainage around the root zone to prevent waterlogged soil during winter. Excess moisture can lead to root rot. Raised beds or planting on a slight slope can help improve drainage.
  • Protecting from Heavy Snow: In regions with heavy snowfall, gently brush off accumulated snow from the plant. Heavy snow can weigh down the branches and potentially cause breakage.
  • Winter Watering: Water the plant well in late fall before the ground freezes. Moist soil helps the plant withstand winter conditions better. However, be cautious not to overwater, as excessively wet soil can lead to root issues.
  • Using Windbreaks: If your garden is prone to strong winter winds, consider installing windbreaks such as burlap screens to shield the Clematis from the drying effects of cold winds.
  • Avoiding Salt Exposure: If the Clematis is planted near areas where de-icing salts are used, protect it from salt exposure, as these can be damaging to the plant. Consider creating a physical barrier or relocating the plant if necessary.
  • Inspecting for Pests and Diseases: Before winter sets in, inspect the plant for any signs of pests or diseases. Treat any issues promptly to prevent them from overwintering and causing more significant problems in the spring.

Cultivating Clematis ‘Jackmanii’ is a rewarding endeavor that brings elegance and charm to your garden. By following these detailed steps on location selection, soil preparation, planting, support provision, and ongoing care practices, you’ll be well on your way to enjoying the magnificent display of deep purple blooms. With proper attention to watering, fertilizing, pruning, and pest control, you can ensure the health and longevity of this captivating clematis variety, creating a stunning focal point in your outdoor space. Happy Gardening…

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