How Much Space to Leave Between Each Viburnum Plant

Viburnums are popular flowering shrubs known for their beautiful blooms, attractive foliage, and ability to thrive in a variety of growing conditions. Whether you’re a seasoned gardener or a beginner, one important consideration when planting viburnums is the spacing between each plant. Proper spacing not only ensures optimal growth and health for each individual plant but also allows for adequate air circulation and reduces the risk of disease. In this article, we will explore how much space to leave between each viburnum plant to achieve the best results.

Factors to Consider

Before discussing the specific spacing requirements for viburnums, it’s important to consider several factors that can influence the decision:

1. Mature Size of the Viburnum Variety

Viburnums come in a wide range of varieties, each with its own unique growth habit and mature size. Some species, like Viburnum opulus (European cranberry bush), can reach heights of up to 15 feet, while others, such as Viburnum carlesii (Korean spice viburnum), typically stay around 6 feet tall. Understanding the mature size of the specific viburnum variety you’re planting is crucial in determining the appropriate spacing.

2. Purpose and Design of the Planting

Consider the purpose and design of your planting when deciding on spacing. If you’re aiming for a dense hedge or barrier, you may want to place the plants closer together. On the other hand, if you’re looking to showcase individual plants or allow for future growth and expansion, wider spacing may be preferable.

3. Soil and Growing Conditions

Soil fertility, drainage, and overall growing conditions can impact how much space each viburnum plant needs. In ideal conditions with rich soil and good drainage, plants tend to grow more vigorously and may require wider spacing compared to less favorable conditions.

4. Pruning and Maintenance

Regular pruning and maintenance can help control the size and shape of your viburnum plants. If you plan to prune regularly, you can allow for closer spacing between plants, as you can manage their growth more effectively.

Recommended Spacing Guidelines

While there is no one-size-fits-all answer to how much space to leave between each viburnum plant, here are some general guidelines based on the mature size of the most common viburnum varieties:

Small Viburnums (3-6 feet tall)

For small viburnums, such as Viburnum carlesii (Korean spice viburnum) or Viburnum plicatum var. tomentosum (Doublefile viburnum), spacing them around 4-6 feet apart is usually sufficient. This allows enough room for the plants to grow and spread while maintaining a compact and attractive appearance.

Medium-Sized Viburnums (6-10 feet tall)

Medium-sized viburnums, like Viburnum x burkwoodii (Burkwood viburnum) or Viburnum x juddii (Judd viburnum), generally require slightly wider spacing than smaller varieties. Aim for a spacing of around 6-8 feet between each plant to provide ample room for their mature size and avoid overcrowding.

Large Viburnums (10+ feet tall)

For larger viburnums, such as Viburnum opulus (European cranberry bush) or Viburnum rhytidophyllum (Leatherleaf viburnum), wider spacing is necessary due to their potential height and spread. A spacing of 8-12 feet between each plant is recommended to allow for proper growth, air circulation, and easy access for maintenance.

Additional Tips

Here are some additional tips to consider when planting viburnums:

1. Prepare the Soil

Before planting, ensure the soil is well-drained and enriched with organic matter. Viburnums prefer slightly acidic to neutral soil pH (around 5.5-7.5), so adjust the soil if necessary.

2. Consider Companion Planting

Viburnums can be complemented by other shrubs or perennials that bloom at different times of the year. Consider incorporating plants with contrasting colors and textures to create an aesthetically pleasing and diverse landscape.

3. Provide Adequate Watering

Proper watering is essential during the establishment period and throughout the plant’s life. Water deeply but infrequently to encourage deep root growth and avoid overwatering, which can lead to root rot.

4. Mulch and Weed Control

Apply a layer of organic mulch around each plant to conserve moisture, suppress weeds, and regulate soil temperature. Regularly inspect and remove any weeds or competing plants that may hinder the growth of your viburnums.

In conclusion, the appropriate spacing between each viburnum plant depends on various factors such as the mature size of the variety, purpose of the planting, growing conditions, and maintenance practices. By considering these factors and following the recommended spacing guidelines, you can ensure healthy growth, optimal performance, and a visually appealing landscape with your viburnum plants. Happy gardening!