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Written by on October 6th, 2016.      0 comments

Mulch is the term used for a variety of organic products which are applied to your garden as either a decorative ground cover, as a soil improvement and to conserve water usage. Bark mulch is one of the most popular mulches available, and comes in bark chips of varying shapes and sizes. Besides bark mulch, wood mulch also comes in a number of other varieties that feed the soil as they decompose, improves the look of your garden, and helps to retain soil moisture all at the same time.

Mulch has many benefits, but the main reason people use it is to boost the look of their gardens and put the finishing touch on their landscaping. Additional benefits include helping plants maintain a more even soil temperature, slow evaporation rates during hot summer days, and prevent weed growth to reduce garden maintenance.

Nitrogen Deficiency

Decomposing wood requires nitrogen. If you add a quantity of fresh wood mulch to your garden soil, chances are your plants will suffer from a lack of nitrogen. In this case, the soil isn't necessarily deficient, but the breakdown of the wood or sawdust brings nitrogen deficiency in your plants. Wood mulches can also induce nitrogen deficiency, but it isn't likely because they decompose at such a slow rate. Bark Mulch wouldn’t be as likely to create a difference due to it already going through more of an aging process than wood. It’s also unlikely because they are on top of the soil, not incorporated at root depth. But if this concerns you, or if your plants show the signs of nitrogen deficiency, add a nitrogen fertilizer suitable to your plants. 

Which Type of Wood Mulch Is Best for Me? 

With a wide range of wood based mulch to choose from, it can be difficult to decide which type to lay down over your garden beds. Here's a list of the most common types, and why, or why not, you should choose these mulches for your landscaping needs.

Bark Mulch is one of the most popular mulches around, because it looks so great once you put it down. It is also an excellent choice when it comes to water conservation, since it provides a solid barrier against moisture evaporation. The one downside of this mulch is its size. Most bark mulch comes in large chips, which decompose slowly. If you can find bark that's been shredded, it would be a better choice. Shredded bark will not only trap moisture in your flower beds better than large chips, but since it decomposes quicker, it more readily adds nutrients to the soil as well.

This article explores the kinds of barks you can buy and their advantages and disadvantages. Several bark available are—Premo® Nuggets, Decorative Nuggets, Forest Floor® mulch and Post Peelings. A chief advantage of these mulches compared with other organic mulches is that they remain attractive and functional for a couple of years. That's why gardeners mulching around trees, shrubs, and other long-lived plants are wise to choose a long-lasting bark mulch.


How to Mulch

Two good rules of thumb are to mulch with 10cm of bark mulch regularly and to avoid mulch layer buildup (and potential nutrient deficiency problems) by removing old layers of undecomposed mulch before adding new layers.

Mulching Your Plants

Whatever the type of plant, it's rarely advised to mulch any more than 6 inches in depth. Mulch layers thicker than that might reduce air circulation in the soil, which will retard plant growth. Also, don't pile mulch around the main stem of a plant where it enters the soil. The added moisture and insect haven that results could damage the plant you're trying to help. Spread the mulch so that it covers the dripline of your plant.

Trees, Shrubs, and Vines

Even around older plants with thick bark, don't crowd mulch around their bases. Most won't succumb to stem rot as quickly as soft-stemmed perennials, but it can happen just the same.

Landscape Situation

Which mulch you choose depends on the site:
Areas Prone to Flooding: Nuggets last many years without breaking down, but they're not useful in wet areas or on steep slopes because of their shapes they roll and wash away easily. Similarly, don't use a fine particle mulch, such as choc mini chip, in windy or seasonally flooded areas since they can blow or float away easily. Of course, aesthetics may weigh heavier in your final decision.

Slopes: On steep slopes, shredded mulch is best such as Forest® Floor, it’s a well-known mulch used by many councils and landscapers known for staying in place and suppressing weeds due to the way it specially binds together.

Pathways: For easiest walking, use a finer bark chip. The small particle size of pathway bark are better for walking compared with mulches with larger particle sizes.
Topics: Home Gardens


About Us

At Wholesale Landscapes, we supply a wide range of landscaping products that are aged and blended to ensure the absolute highest quality. We deliver commercial quantities of bark-based landscape supplies to resellers and projects across NZ. We have a trade yard in Stoke, Nelson where landscapers and contractors can conveniently pick up bulk landscape supplies - all year round.

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