Planting Vinca Minor (Periwinkle): Step-by-Step Guide
Proper planting techniques are essential for the successful growth of Vinca Minor. The best time to plant is during the cooler seasons—spring or fall—when increased rainfall supports root establishment.
Preparing the Planting Site
Start by choosing a well-drained area that receives partial sun to full shade. Enhance the soil by incorporating compost or organic matter. This not only improves soil structure but also boosts nutrient content, giving your plants a healthy start.
Spacing and Planting Depth
Space plants 8-12 inches apart to ensure rapid ground coverage. Dig a hole deep enough to cover the root ball completely. Placing the root ball at this depth helps the plant stabilize and promotes vigorous growth.
Initial Care After Planting
After planting, water thoroughly to settle the soil around the roots. Apply mulch around the base to retain moisture and discourage weed growth. Mulching also helps maintain a steady temperature in the root zone.
Steps for Planting Vinca Minor
Below are five key steps to ensure successful planting:
- Choose the Right Season: Plant in spring or fall for optimal growth.
- Prepare the Soil: Incorporate compost to enrich soil quality.
- Spacing: Place plants 8-12 inches apart for quick coverage.
- Planting Depth: Ensure the root ball is completely covered.
- Post-Planting Care: Water thoroughly and apply mulch to retain moisture.
Attributes | Details |
Botanical Name | Vinca minor |
Common Name | Periwinkle, vinca minor |
Family | Apocynaceae |
Plant Type | Perennial evergreen |
Mature Size | 3-9 in tall, 18-24 in long |
Sun/Light Exposure | Full sun to partial shade |
Soil Type | All types |
Soil pH | Acidic, neutral, alkaline |
Bloom Time | Spring, summer |
Flower Color | Blue, purple, white |
Hardiness Zone | 4-9 USDA |
Native Area | Europe |
Soil and Light Requirements for Vinca Minor
Soil Requirements
Vinca Minor prefers well-drained soil that is rich in organic matter. This type of soil ensures that the roots have adequate drainage to prevent rot and promote healthy growth. While this plant tolerates poorer soils, enhancing the planting area with compost or other organic materials can lead to more vigorous growth and a healthier plant overall.
Light Conditions
This plant thrives best in partial sun, partial shade, and full shade. Partial sun ensures that the plant receives enough light for photosynthesis without the risk of burning. It is also well-suited for shady areas, making it a versatile option for various garden conditions. Deep shade is tolerated, although it might lead to slower growth. Direct sunlight, however, can cause the leaves to burn, so it’s crucial to avoid placing the plant in such conditions.
Tips for Improving Soil Quality
To enhance soil conditions for Vinca Minor, consider the following tips:
- Incorporate Compost: Adding compost will increase the soil’s organic content.
- Use Well-Aged Manure: This can further enrich the soil with essential nutrients.
- Ensure Good Drainage: Use materials like sand or small stones to improve drainage.
- Regular Soil Testing: Adjust pH levels as needed to ensure the soil remains slightly acidic to neutral.
Adjusting Light Conditions
To optimize growth, manage the plant’s exposure to light carefully:
- Partial Sun: Ideal for most Vinca Minor plantings, as it offers good growth without the risk of burning.
- Partial Shade: Ensures that the plant receives sufficient light while being protected from the harsh midday sun.
- Full Shade: Suitable for areas where other plants may struggle, though growth might be slower.
Maintaining these conditions can help prevent issues such as leaf burn while ensuring healthy growth and vibrant foliage.
Soil Improvement Tips
Improving soil quality can significantly benefit the growth of Vinca Minor. Consider the following practices:
- Regularly add compost or organic matter to maintain nutrient levels.
- Aerate the soil periodically to improve root penetration and growth.
- Maintain a consistent pH level to avoid nutrient lockout.
- Monitor soil moisture to ensure the soil remains moist but well-drained.
Light Condition | Suitability for Vinca Minor |
---|---|
Partial Sun | Ideal, promotes healthy growth |
Partial Shade | Good, prevents leaf burn |
Full Shade | Tolerable, but slower growth |
By following these guidelines for soil and light conditions, you can create an environment in which Vinca Minor thrives, ensuring lush and healthy plants.
Watering and Feeding Vinca Minor
Importance of Proper Watering
Maintaining an appropriate watering schedule is vital for the growth and health of Vinca Minor. This plant prefers consistently moist soil, but it is crucial not to overwater as it can lead to root rot. The key is to keep the soil evenly moist without becoming waterlogged, ensuring that the roots receive adequate hydration while avoiding excess water buildup.
Detailed Watering Schedule
Water Vinca Minor deeply once a week, ensuring that the top 1-2 inches of soil remain moist. During hot summer months, you may need to increase watering frequency, while in cooler seasons, you can reduce it. Always monitor soil moisture and adjust accordingly, especially during periods of extreme weather.
Feeding Requirements
Fertilizing Vinca Minor regularly encourages lush foliage and vibrant blooms. A balanced fertilizer is an excellent choice, providing the necessary nutrients for healthy growth. Apply a slow-release or liquid fertilizer monthly during the growing season (spring through early fall). Organic options like compost tea or fish emulsion are also beneficial alternatives, supplying vital nutrients without the risk of chemical buildup.
Tips for Avoiding Overwatering and Overfeeding
To keep your plant healthy, avoid common pitfalls like overwatering and overfeeding. Overwatering can lead to root issues, while overfeeding can cause nutrient toxicity.
Signs to watch for:
- Overwatering: Yellowing leaves, wilting, or root rot.
- Overfeeding: Leaf burn, stunted growth, or salt buildup on the soil surface.
Essential Watering Tips for Vinca Minor
Follow these tips to maintain optimal soil moisture:
- Check Soil Moisture: Use your finger to test soil moisture before watering.
- Water Deeply: Ensure thorough watering to reach the root zone.
- Mulch: Apply mulch to retain moisture and stabilize soil temperature.
- Morning Watering: Water plants in the morning to reduce evaporation and fungal growth.
- Adjust Seasonally: Modify watering frequency based on seasonal changes.
Fertilizer Application Guide
Fertilizer Type | Application Frequency |
---|---|
Balanced | Monthly during growing season |
Organic (e.g., compost tea) | Every 4-6 weeks |
Slow-release | Once every 3 months |
By adhering to these watering and feeding guidelines, you can ensure that your Vinca Minor remains robust and flourishing, contributing to a healthy, vibrant garden.
Pruning and Maintenance of Vinca Minor
Importance of Pruning
Pruning is a crucial maintenance task for Vinca Minor. It helps control the plant’s spread, encourages new growth, and maintains a neat appearance.
Performing this activity in early spring is particularly beneficial, as it stimulates the development of fresh, healthy shoots. Regular pruning also prevents the plant from becoming too invasive, which can be a common issue with this vigorous grower.
Step-by-Step Pruning Guide
Pruning Vinca Minor doesn’t require specialized tools, but having a sharp pair of pruning shears will ensure clean cuts. Here is a step-by-step guide:
- Inspect the Plant: Look for any dead or diseased stems. Remove these first to prevent the spread of disease.
- Cut Back Long Stems: Trim the long runners to encourage bushier growth. Cut back up to one-third of the plant.
- Shape the Plant: Prune to maintain a desired shape. This will keep the plant looking tidy and controlled.
- Clean Tools: Disinfect your pruning shears before and after use to avoid transmitting diseases between plants.
Regular Maintenance Practices
Maintaining Vinca Minor involves a few other key tasks beyond pruning:
- Weeding: Regularly weed around the plants to reduce competition for nutrients and water.
- Fertilizing: Apply a balanced fertilizer once in early spring to support robust foliage and flowering.
- Managing Spread: Check the growth regularly to prevent the plant from spreading uncontrollably. Use barriers if necessary.
Seasonal Maintenance Tips
Adjusting maintenance routines to the seasons can help keep Vinca Minor in prime condition throughout the year:
- Spring: Prune back stems, apply fertilizer, and start regular watering as the weather warms up.
- Summer: Focus on weeding and check soil moisture regularly, increasing watering if necessary.
- Fall: Reduce watering and cut back on fertilization as the plant enters dormancy.
- Winter: Mulch around the base to protect roots from extreme cold.
Pruning Tips for Healthy Growth
Here are five essential tips for effective pruning:
- Prune in Early Spring: This encourages new growth before the active growing season.
- Use Clean Tools: Disinfect pruning shears to prevent disease spread.
- Remove Dead or Diseased Parts: This helps keep the plant healthy.
- Cut Back Long Stems: Promotes a bushier plant and prevents uncontrolled spreading.
- Regular Pruning: Consistent pruning helps maintain shape and prevents invasiveness.
Maintenance Task | Frequency |
---|---|
Pruning | Annually, in early spring |
Weeding | As needed, ideally monthly |
Fertilizing | Once, in early spring |
Watering | Weekly, adjusting for weather conditions |
By following these pruning and maintenance guidelines, Vinca Minor can remain a healthy, attractive addition to any garden.
Propagating Vinca Minor
Overview of Propagation Methods
Vinca Minor can be propagated through seeds, stem cuttings, or divisions. Each method offers unique benefits:
- Seeds: Provides a large number of new plants but may have variable growth rates.
- Stem Cuttings: Reliable and relatively quick method.
- Divisions: Fastest way to propagate mature plants and ensures identical clones.
Seed Propagation Guide
To propagate Vinca Minor from seeds, follow these steps:
- Seed Preparation: Purchase quality seeds or collect them from mature plants.
- Soil Preparation: Use a well-draining seed-starting mix.
- Planting: Sow seeds shallowly and cover lightly with soil.
- Watering: Keep the soil consistently moist but not waterlogged.
- Germination Conditions: Place in a warm, partially shaded area. Germination takes about 2-3 weeks.
Propagating from Stem Cuttings
Stem cuttings offer a quick and efficient way to propagate Vinca Minor. Here’s a step-by-step guide:
- Select Healthy Stems: Choose non-flowering stems about 4-6 inches long.
- Cut Below a Node: Make a clean cut below a leaf node.
- Remove Lower Leaves: Strip the leaves from the lower half of the cutting.
- Planting: Insert the cutting into a pot filled with a mix of half perlite and half peat.
- Water and Care: Water thoroughly and maintain high humidity by covering with a plastic bag. Roots should develop in 2-3 weeks.
Dividing Established Plants
Division is the quickest propagation method, suitable for mature plants.
- Choose Mature Plants: Select healthy, well-established plants.
- Prepare the Plant: Water the plant thoroughly the day before dividing.
- Dig Up the Plant: Carefully dig around the plant to lift it from the soil.
- Separate the Clumps: Gently tease apart the root system to create several smaller clumps, ensuring each has roots and shoots.
- Replanting: Replant each division into prepared soil, spacing them adequately for growth.
Key Steps for Successful Propagation
Here’s a quick list to help you propagate Vinca Minor successfully:
- Seed Preparation: Use quality seeds and prepare an appropriate soil mix.
- Stem Cuttings Selection: Choose healthy stems and use a clean cutting method.
- Division Technique: Select mature plants and carefully separate them into clumps.
- Replanting and Care: Plant in well-prepared soil and maintain moisture.
Propagation Method | Best Time to Propagate |
---|---|
Seeds | Late spring to early summer |
Cuttings | Late spring to early summer |
Divisions | Late spring to early summer |
Using these methods, you can propagate Vinca Minor effectively, enhancing your garden with new plants.
Managing Pests and Diseases in Vinca Minor
Common Pests and Diseases
Aphids, spider mites, and fungal leaf spots frequently affect Vinca Minor. Additionally, root rot is a significant issue that arises from poor drainage or overwatering. Understanding these common problems is the first step toward effective management.
Identifying and Treating Pests
Aphids and spider mites are small insects that feed on plant sap, causing leaves to yellow and curl. To treat these pests, consider both natural and chemical methods:
Natural Methods
- Introduce beneficial insects like ladybugs that feed on aphids.
- Use neem oil or insecticidal soap, which are effective against both aphids and spider mites.
Chemical Methods
- Apply a systemic insecticide designed for garden use for severe infestations.
- Follow label instructions closely to avoid damaging the plants.
Preventing and Managing Diseases
Fungal leaf spots and root rot are prevalent diseases in Vinca Minor. Proper watering techniques and vigilant disease prevention are crucial.
Fungal Leaf Spots
- Symptoms: Irregular brown or black spots on leaves.
- Avoid overhead watering to reduce moisture on foliage.
- Remove and dispose of affected leaves to prevent the spread of the fungus.
Root Rot
- Symptoms: Wilting, yellowing leaves, and mushy roots.
- Ensure soil is well-drained; amend heavy soils with sand or organic matter to improve drainage.
- Avoid overwatering and allow the soil to dry slightly between waterings.
Long-term Pest and Disease Management
Integrated Pest Management (IPM) is an effective approach for long-term control. This strategy combines regular monitoring and a combination of biological, cultural, and chemical methods to manage pests and diseases.
Regular Monitoring
- Inspect plants weekly to catch issues early.
- Keep a garden journal to track pest and disease occurrences.
Integrated Pest Management Strategies
- Biological Control: Use beneficial insects and microorganisms to control pest populations naturally.
- Cultural Practices: Rotate plant locations annually to prevent buildup of soil-borne diseases.
- Chemical Control: Apply targeted treatments only when necessary to minimize chemical use.
Effective Pest Control Methods
Here are five effective methods to control pests in Vinca Minor:
- Introduce Beneficial Insects: Ladybugs and predatory mites.
- Apply Neem Oil: Effective against a variety of pests and safe for most plants.
- Use Insecticidal Soap: A non-toxic option for treating infestations.
- Maintain Cleanliness: Remove debris and fallen leaves to reduce habitat for pests.
- Proper Watering: Avoid overhead watering to prevent fungal issues.
Pest/Disease | Symptoms | Treatment |
---|---|---|
Aphids | Yellowing leaves, curling | Neem oil, beneficial insects |
Spider Mites | Speckled leaves, webbing | Insecticidal soap, systemic insecticides |
Fungal Leaf Spots | Brown/black spots on leaves | Avoid overhead watering, remove affected leaves |
Root Rot | Wilting, yellowing leaves, mushy roots | Improve soil drainage, avoid overwatering |
By recognizing and addressing these common pests and diseases, you can maintain the health and vitality of your Vinca Minor, ensuring a beautiful and thriving garden.
Benefits and Uses of Vinca Minor
Overview of Benefits
Vinca Minor offers numerous benefits for gardeners and landscapers alike. This plant is particularly valued for its ability to control erosion on slopes and other problematic areas.
Its dense mat of foliage helps anchor the soil, significantly reducing the risk of erosion. Additionally, Vinca Minor is known for its low maintenance, making it an attractive option for those who prefer minimal upkeep in their gardens.
Landscape Uses
Thanks to its versatile nature, Vinca Minor can be used in various landscape applications. It serves exceptionally well as ground cover, creating a lush, green carpet that suppresses weeds and adds visual appeal.
It can also be used for borders along pathways or garden beds, providing a well-defined edge. Another popular use is planting under trees and shrubs where grass struggles to grow. Vinca Minor thrives in these shaded conditions, filling in bare spots with ease.
Benefits for Wildlife
Beyond its horticultural benefits, Vinca Minor also plays a role in supporting local wildlife. Its dense foliage offers shelter and habitat for small animals and insects, contributing to a more biodiverse environment.
By incorporating this plant into your garden, you can create a sanctuary for various beneficial species, enhancing the ecological balance of your yard.
Main Benefits of Using Vinca Minor in Landscaping
Here are the four primary benefits of incorporating Vinca Minor into your landscape design:
Benefit | Description |
---|---|
Erosion Control | Stabilizes soil on slopes, reducing erosion risk. |
Low Maintenance | Requires minimal care and upkeep. |
Ground Cover | Provides dense coverage that suppresses weeds. |
Wildlife Habitat | Offers shelter for small animals and beneficial insects. |
Leveraging these benefits, Vinca Minor not only enhances aesthetic appeal but also contributes functionally and ecologically to any garden.
Seasonal Care for Vinca Minor
Introduction to Seasonal Care Needs
Caring for Vinca Minor throughout the year requires adjusting your approach based on the season. Each season presents unique challenges and opportunities for growth, making it essential to tailor care practices accordingly.
Winter Care Tips
During winter, Vinca Minor can be sensitive to frost. If you live in an area with harsh winters, consider moving container plants indoors to protect them from freezing temperatures. For plants in the ground, apply a thick layer of mulch around the base to insulate the roots. This helps to maintain a more consistent temperature and reduces the risk of frost damage.
Summer and Drought Care
In summer, Vinca Minor may face drought conditions. While established plants are somewhat drought-tolerant, it’s important to maintain soil moisture to prevent stress.
Water the plants deeply once a week, more frequently during prolonged dry spells. Mulching can also help retain soil moisture by reducing evaporation rates.
Spring and Fall Care
Spring and fall are ideal times for active maintenance. In early spring, start with light pruning to remove dead or damaged stems. This encourages fresh growth and keeps the plant healthy.
Fertilize the plant at the beginning of the growing season to provide essential nutrients. During fall, reduce watering as the plant prepares for winter dormancy. Also, apply mulch to protect the roots from the approaching cold.
Seasonal Care Tips for Vinca Minor
Here are four essential tips to keep your Vinca Minor in prime condition throughout the year:
Season | Care Tips |
---|---|
Winter | Move indoors if necessary, mulch to protect from frost |
Summer | Deep weekly watering, mulch to retain soil moisture |
Spring | Light pruning, fertilization to promote new growth |
Fall | Reduce watering, apply mulch for winter protection |
Tailoring your care based on these seasonal tips ensures that Vinca Minor remains healthy and vibrant throughout the year.
Vinca Minor in Garden Design and Landscaping
Using Vinca Minor in Garden Design
Incorporating Vinca Minor into your garden design can dramatically enhance both the aesthetic and functional aspects of your landscape. With its lush foliage and delicate flowers, it offers visual appeal year-round.
This versatile plant can be employed in various ways to create a beautiful and well-organized garden. Its ability to provide ground cover is especially beneficial, as it helps suppress weeds and prevents soil erosion.
Ground Cover and Border Usage
Vinca Minor excels as a ground cover, creating a dense carpet of greenery that effectively controls weed growth. Its low-growing habit and spreading nature make it ideal for rapidly filling bare patches in your garden.
Additionally, it can be used along borders to define garden beds and pathways, adding a soft, natural edge that contrasts nicely with hardscape elements. Using this plant as a border can also help unify different areas of your garden, creating a more cohesive design.
Enhancing Garden Aesthetics
Vinca Minor’s vibrant foliage and charming flowers can significantly boost the visual appeal of your garden. The plant’s adaptability to various light conditions allows it to thrive in both sunny and shaded areas, making it a versatile choice for different garden spots. Here are some design tips to optimize its visual impact:
- Color Combinations: Pair Vinca Minor with flowering plants of contrasting colors such as marigolds or impatiens to create striking visual interest.
- Layering: Plant Vinca Minor in front of taller plants or shrubs to establish a layered effect, adding depth and dimension to your garden.
- Pathways and Walkways: Line walkways with Vinca Minor to create a lush, inviting path through your garden.
Creating a Vinca Minor Landscape Plan
Planning is crucial for integrating Vinca Minor effectively into your garden. Start by identifying areas that would benefit from its ground cover capabilities, such as slopes or unused spaces under trees. When creating your landscape plan, consider the following steps:
- Assess Garden Areas: Identify sections that require ground cover, borders, or weed control.
- Design Layout: Sketch a layout including where Vinca Minor will be planted. Ensure proper spacing to allow room for growth.
- Combine with Other Plants: Pair Vinca Minor with other compatible plants based on light and soil requirements.
- Maintenance Planning: Incorporate routine maintenance tasks such as pruning and watering into your overall garden care plan.
Design Ideas Using Vinca Minor
Consider these four ideas to utilize Vinca Minor effectively in your garden:
Design Use | Benefits |
---|---|
Ground Cover | Prevents soil erosion and suppresses weeds |
Borders | Defines garden sections and walkways |
Under Trees | Fills in areas with poor light or soil conditions |
Aesthetic Appeal | Enhances visual interest with lush foliage and flowers |
By incorporating these elements into your garden design, you can maximize both the beauty and functionality of Vinca Minor, creating a lush and visually appealing landscape.
Common Issues and Solutions for Vinca Minor
Introduction to Common Issues
Vinca Minor, a popular ground cover, can encounter various challenges that impact its growth and health. The primary issues include invasiveness, pest infestations, and diseases.
Regular monitoring and proper care can help prevent and mitigate these problems, ensuring the plant thrives in your garden.
Addressing Invasiveness
One of the main disadvantages of Vinca Minor is its invasive nature. It spreads rapidly and can outcompete other plants if left unchecked.
- How to Control Spread: Keep the plant contained within defined borders. Regularly prune to manage its growth and prevent it from encroaching on other areas.
- Barriers: Use physical barriers like landscape edging to keep the plant in its designated space.
Managing Pest Infestations
Vinca Minor is susceptible to pests such as aphids, spider mites, and scale insects, which can damage the plant.
- Aphids: Small, green insects that cause yellowing and curling of leaves. Treat by spraying neem oil or insecticidal soap.
- Spider Mites: Recognizable by the fine webbing on leaves, they cause speckled and discolored foliage. Increase humidity and apply miticides if necessary.
- Scale Insects: Hard, shell-like pests that sap nutrients, leading to stunted growth. Remove them manually or use horticultural oil.
Preventing and Treating Diseases
Diseases such as fungal leaf spots and root rot can significantly affect Vinca Minor’s health.
- Fungal Leaf Spots: Occur as brown or black spots on leaves. Prevent by avoiding overhead watering and maintaining good air circulation. Remove affected leaves promptly.
- Root Rot: Symptoms include wilting and yellowing leaves, caused by overwatering and poor drainage. Improve soil drainage by amending with sand or organic matter and ensure the soil isn’t waterlogged.
Common Issues and Solutions for Vinca Minor
- Invasiveness:
- Solution: Regular pruning and using physical barriers.
- Pest Infestations:
- Solution: Treat aphids with insecticidal soap, spider mites with miticides, and scale insects manually or with horticultural oil.
- Diseases:
- Solution: Prevent fungal leaf spots by avoiding overhead watering and treat root rot by improving soil drainage.
- Overgrowth:
- Solution: Regular maintenance and pruning to control spread.
- Soil Issues:
- Solution: Amend soil with organic matter for better drainage and nutrient content.
By proactively addressing these issues, you can ensure Vinca Minor remains a healthy and attractive ground cover in your garden.
Final Thoughts on How to Grow and Care for Vinca Minor (Periwinkle)
Planting Vinca Minor correctly involves choosing the right season, preparing the soil, and ensuring proper spacing and depth. It thrives in well-drained soil with partial sun to full shade.
In addition, proper watering, feeding, and pruning are crucial for its health.
Effective propagation, pest management, and seasonal care will also enhance its growth.
Vinca Minor is a very useful plant that offers numerous benefits for both landscaping and wildlife.
By following these steps, you can successfully grow and care for Vinca Minor, creating a lush and low-maintenance garden.
FAQ
How to grow and care for Vinca Minor Periwinkle in winter?
To care for Vinca Minor in winter, protect plants from frost by mulching heavily. In severe cold, consider moving potted periwinkles indoors.
How to grow and care for Vinca Minor Periwinkle in pots?
Choose well-draining pots and use rich, organic soil. Water regularly but avoid waterlogging. Place the pot in partial shade to ensure healthy growth.
How to grow and care for Vinca Minor Periwinkle from seed?
Sow seeds in moist, well-drained soil in late spring. Maintain a temperature of 65-70°F for germination. Thin seedlings to allow space for growth.
Vinca Minor ground cover problems?
Common problems include invasiveness, which can be controlled by regular pruning. Pests like aphids and spider mites can also be issues, manageable with natural or chemical treatments.
Vinca Major vs Vinca Minor?
Vinca Major has larger leaves and is more aggressive, ideal for ground cover. Vinca Minor is less invasive and suitable for borders and shaded areas.
Will periwinkle kill other plants?
Vinca Minor can outcompete other plants due to its competitive growth. Regular pruning and proper spacing can prevent it from overtaking other plants.
Types of periwinkle flowers?
Vinca Minor has blue, purple, and white flowers, typically blooming in spring and early summer. Varieties include ‘Bowles’ and ‘Alba’.
Where does Vinca Minor grow best?
Vinca Minor grows best in well-drained soil with partial shade. It can also tolerate full shade and poor soil, making it versatile for various garden spots.
Does Vinca Minor come back every year?
Yes, Vinca Minor is a perennial plant that returns each year with minimal maintenance, providing reliable ground cover and blooms.
How do you encourage periwinkle to spread?
To encourage spread, space plants 8-12 inches apart and prune in early spring. This promotes new growth and rapid ground coverage.
Where is the best place to plant Vinca?
The best place to plant Vinca is in partial to full shade with well-drained soil. It thrives under trees, along borders, and in areas needing ground cover.