Bark Chippings for Garden Use: The Type Your Plants Need!

Key Takeaways

• Fresh bark and composted bark are two different products. Fresh bark is a decorative mulch that looks great on the surface, holding its colour for years; composted bark is an excellent soil improver that goes into the ground.
• Fresh conifer bark contains natural plant-defence compounds that can hold back germination and knock young plants about. Fallow it for 3-4 months before putting it anywhere near new planting. Around established shrubs it is fine as it comes.
• Bark chippings suppress weeds at 5 to 7.5cm and hold moisture at 7.5 to 10cm. An 80-litre bag at 5cm covers only about 1.5 square metres, so measure before you order.
• Budget bark products are often padded with wood shavings, which rot faster, look worse and steal more nitrogen than bark does.
• Smell the load before you spread it. Good bark smells of cut wood or damp earth. Vinegar, ammonia or rotten eggs means it has gone sour in the pile and it will scorch soft growth.
• Bark goes straight onto the soil in a planted border. Laid on membrane it dries out, lightens, blows across the garden and the birds scatter the rest.

I get asked which bark to buy more often than I get asked how to lay it, and that is the right way round, because most bark disappointments are bought rather than spread. The wrong grade for the job, a bargain load that turns out to be half shavings, fresh conifer bark tipped around brand new planting – the list goes on. The classic version goes like this. Someone orders on price alone for a big front border, spreads it thin over a sheet of fabric, and by August it has gone pale, a good third of it is on the lawn and in next door’s drive, and they have decided bark does not work. The bark was fine. The buying was not.

So this page is the bark half of the buying decision: every type you will find in the UK, what each one is for, and the two checks I make before a load of mine goes on a client’s garden. If you have already got the bark and want to know how to put it down, that is a different article.

What Is the Difference Between Bark Chippings and Wood Chips?

Bark chippings and wood chips come from different parts of the tree, and the difference decides how long your border keeps looking new. Bark is the outer layer only, and should have no heartwood in it. It is separated from the trunk at the mill and screened into grades. Wood chip is the wood itself, straight out of a chipper. Suppliers label it bark chippings, garden bark, tree bark or just bark chips, and those are all the same material. Bark and wood chip are not the only pair people get confused about. If the other bag you are looking at says “mulch”, mulch or bark explains what’s actually in it.

The practical difference at the checkout is colour and lifespan. Bark rots slowly and keeps its colour for years. Wood chip fades within a season or so and needs topping up sooner. That is most of why bark costs more, and it is the whole reason I use bark on anything a client looks at from the kitchen window and wood chip on the working parts of a garden. The full wood-chip side of the comparison, including the jobs where wood is the better buy, is in my guide to the types of wood chippings.

Types of Bark Chippings: Which Is Best for a Garden?

TLDR: pine and decorative grades where it has to look good, nuggets where it has to last, landscaping bark where the area is big, composted bark when the soil is the problem rather than the appearance.

There is no single best bark chippings for garden use, because the grades are doing different jobs. These are the ones worth knowing apart.

Pine Bark Nuggets

Pine bark nuggets are the chunkiest grade, and they last longest of anything out there. Big pieces have less surface area for their volume, so they rot slower, and they are heavy enough that they stay put on a slope or an exposed corner where a fine bark would migrate. I use them on established shrub borders I want to leave alone for years. One caution from experience: a mower will fire a nugget a long way and can wound the bark of a young tree or shrub when it lands, so keep them back from lawn edges. The sizes and longevity are compared in our pine bark mulch range.

Pine and Conifer Bark

Pine bark is the pick of the decorative barks and it is priced accordingly. It is slow to break down, it holds a warm reddish-brown colour longer than anything else in the category, and it is my choice for large shrub borders and rose beds where I want the bed to look deliberate for three or four years rather than one. Most British garden bark is conifer bark of some kind, so the fresh-versus-composted question below applies to it directly.

Composted Bark

Composted bark is a soil improver rather than a decorative mulch, and it is the one product in this list I buy for what it does under the surface rather than on top. It is darker, finer and already part-rotted, so it feeds the soil from the day it goes down, improves moisture and nutrient holding, and opens up heavy ground. It is also what I use instead of peat, which I will not use at all. The trade-off is appearance and lifespan: it looks like dark compost because that is roughly what it is, and it disappears into the soil far quicker than an ornamental bark. We have a product comparison with all of the details in compost mulch range.

Decorative Bark

Decorative bark is the mid-size ornamental grade, screened for an even piece size so a finished border looks tidy rather than random. It is the default for front gardens, planted beds either side of a path, and anywhere the bark is part of the design instead of just a job. It is also the grade where quality varies most between suppliers, which is why the sample check below matters most here. Ours are compared in the decorative bark range.

Landscaping Bark

Landscaping bark is the budget grade for covering ground, and it is honest about what it is: coarser, more varied in piece size, less uniform in colour. For a big bank, a woodland edge or the far end of a large garden it is the sensible buy, and I would rather put a proper depth of landscaping bark down than a thin scatter of something expensive. The range is in our landscaping bark comparison.

Play Bark

Play bark is graded and tested specifically for use under swings, slides and climbing frames, and it is not the same thing as garden bark even when it looks similar in the bag. Depth for a play surface is a safety figure set by the fall height of the equipment, not a preference, so work it out with the play bark calculator rather than the mulching depths on this page. The difference between the two products is set out in play bark vs garden bark.

Coloured Bark

I only use coloured bark where a client really insists. It is dyed ‘bark’, and the question worth asking is not about the dye so much as what is underneath it. I have covered how it is made and what to look for in my coloured bark guide.

Fresh or Composted Bark: Which Should You Use?

Composted bark is the safe choice around new planting and fresh bark is the better buy for established borders, and that distinction is the whole answer. Fresh conifer bark carries the compounds the tree made to defend itself, tannins among them, and those compounds hold back germination and can knock establishing plants about. It is a real effect, not a myth, and it is more pronounced in conifer bark than in broadleaf material. What it is not is a reason to avoid bark: mature, well-rooted shrubs are not troubled by it, which is why fresh bark is perfectly good on an established border as it comes.

The fix is time, and it is the simplest job in gardening. Stack the bark in a pile and leave it to weather for three or four months, turning it if you can get at it, and those compounds break down. After that it is safe even on newly planted beds. If I am mulching something I have just put in the ground and I have not got aged bark to hand, I use composted bark instead and keep the fresh stuff for the parts of the garden that have been there for years.

Nitrogen is the other half of the fresh-bark question and it gets overstated. Bark sitting on the surface borrows very little nitrogen from established plants, because the action is happening at the join between mulch and soil while the roots that matter are well below it. Bark dug into the soil is a different story: the microbes breaking it down will strip nitrogen from the bed while they work. So mulch with it and do not rotavate it in. If a mulched border does yellow in its first season, that and nine other faults are covered in my bark and woodchip mulch fixes.

The Two Checks I Make Before Buying Any Load of Bark

How Do You Tell Good Bark from Cheap Bark?

You tell good bark from cheap bark by what the supplier will tell you about it before you order, because by the time it is on your drive the decision is already made. Buying bark online is not like buying stone, where a sample tells you most of what you need. Bark is a graded organic product and it moves batch to batch, so a handful posted out weeks earlier proves very little about the load that turns up.

Here is what actually separates the two. Cheap bark gets padded out with wood shavings, the curled stuff off a planer, because shavings are cheap and they bulk a load out cheaply. They rot far faster than bark, they go grey and stringy while doing it, and thin softwood shavings are the hungriest nitrogen thieves of the whole wood family. Proper bark is recognisably bark: plate-like pieces, ridged on one side, mostly brown rather than blonde. A load heavy in pale curls is not a bargain, it is a smaller quantity of bark than you paid for.

So buy on the specification rather than the picture. Before you order anywhere, I would want to know a few things (found on this site):

1. What it actually is. Bark, or bark with wood content in it. If a description will not say, that is usually the answer.
2. What grade it is screened to, stated as a size range rather than a mood word. “Fine”, “medium” and “chunky” mean different things at different suppliers.
3. Whether it is graded consistently between batches, which is the whole difference between a screened product and whatever came off the pile that morning.

Then smell it before you accept it. Bark gets stockpiled at the mill, the yard and the garden centre, and a pile left too long without air turns anaerobic. Sour bark smells of vinegar, ammonia or rotten eggs, and spreading it will scorch soft growth on contact. Good bark smells of cut wood or damp earth, and that is the whole test. Bagged product is not exempt either, since a wet bag with no ventilation holes can sour inside the plastic. If you open a bag and find a white fluffy bloom on the bark, that is usually just decomposition getting going rather than anything wrong; it is the smell that tells you, not the fluff. What sour mulch does to plants, and how to tell it apart from drought damage, is in the mulch problems guide.

How Deep Should Bark Chippings Be?

Bark chippings need different depths for different jobs, and depth is the number that decides whether the stuff works at all. A thin scatter looks smart for a month and then quietly composts into nothing. My working figures:

The two that catch people out are the top-up and the trunk. Refreshing is 2.5cm, not another full layer, and I would rake the existing bark over with a leaf rake before buying anything at all, because that often brings the colour back for free. And bark piled against a trunk holds damp where the plant least wants it, so leave the gap.

For quantities, an 80-litre bag at 5cm covers about 1.5 square metres, which is less than almost everyone expects. The bark and wood chip calculator will turn your bed measurements into an order, and the laying itself is covered step by step in how to lay bark chippings.

How Long Do Bark Chippings Last?

Bark chippings keep their looks for years, which is the whole reason people pay more for bark than for wood chip. A decorative or pine grade will still be doing its job visually into a third or fourth season in a sheltered border, and nuggets outlast everything because there is less surface area for the weather to work on. Fine ground bark is the quickest of the decorative grades to go, and composted bark is quickest of all, though in that case disappearing into the soil is the point rather than a failure.

Judge a layer by its depth and not by its colour. Rake it first, check what depth you have actually got left underneath, and only top up if it has genuinely thinned. Replacing a whole layer because it has gone a bit grey is money on the border and, done every spring, it is how a bed ends up at 12 to 15cm with the shallow-rooted plants choking underneath.

Do You Need a Membrane Under Bark Chippings?

Weed membrane does not belong under bark chippings in a planted border, and I do not lay it that way. Plenty of guides tell you to put fabric down first, and it does sell fabric. The problem is that bark on membrane cannot draw moisture up from the soil beneath, so it dries out, and dry bark is light bark. Light bark blows across the rest of the garden and the birds pick through what is left and flick it onto the path. On soil, a decent grade takes up moisture, holds its weight and stays where you put it, while doing the job bark is actually for, which is feeding and protecting the ground rather than imitating gravel.

Paths are the exception, because nothing is planted there and nothing needs to come up through it. That is the one place I will lay bark or chip over a membrane, and the build is in the wood chip path guide.

What Are Bark Chippings Used For?

Bark chippings get used for mulching, soil improvement, containers, play areas and paths, and most of those have their own guide on this site, so this is the map:

• Borders and mulching: the main job. Depths are in the table above, and the how-to is in laying bark and chips.
• Soil improvement: composted bark, worked in rather than laid on. Where bark sits in the wider family of mulches is set out in what is mulch.
• Containers: bark is a good pot topping, light and easy to handle, and at 5 to 7.5cm deep it stops adult vine weevils laying eggs in the compost surface, which is a genuine benefit almost nobody mentions. It will not acidify the compost underneath, whatever you read, but it does no harm to ericaceous planting either, so I am happy topping rhododendrons, azaleas and camellias with it. The one warning is that a pot has no soil mass beneath to keep the bark damp, so a dried-out topping can shed pieces in the wind.
• Play areas: certified play bark only, sized by fall height, never a garden grade.
• Paths: not bark’s strongest job. For anything walked on regularly I use hardwood chips instead, because they take the traffic better.
• Chicken runs: not bark at all. Bark can grow moulds that do real harm to poultry, and hardwood chip is the material for that job. The reasoning is in the wood chip for chicken runs guide.

Next Steps

If you have measured up, the bark and wood chip calculator will turn your dimensions into an order with a settlement allowance built in. We carry pine and decorative grades, landscaping bark, composted bark and certified play bark in builders, bulk and jumbo bags with nationwide delivery, and the full range is in our bark mulch category. If your job is an awkward one, get in contact and we will spec it with you before you order.

Have you used bark chippings in your own garden? What did you put it on, and how long did it stay looking fresh? Tell us in the comments.

FAQs

Do bark chippings stop weeds?

Bark chippings at 5 to 7.5cm stop most annual weeds by keeping the light off them, and that depth is the deal-breaker, because a thin layer just gives seed a comfortable bed. Established perennial weeds like bindweed will push through any mulch, so clear those before you spread.

Is bark or wood chip better for a garden?

Bark is better wherever appearance matters, because it holds its colour for years where wood chip fades within a season or so. Wood chip is better value for large working areas and for paths, where it takes traffic better than bark does.

How often do bark chippings need topping up?

Bark chippings need checking each spring rather than topping up on a schedule. Rake the layer over first, which often restores the look on its own, then add about 2.5cm only if it has genuinely rotted down. Every two or three years is the realistic rhythm for a decorative grade.

Can I put bark chippings straight onto soil?

Bark chippings go straight onto weeded, moist soil in a planted border, and that is exactly how I lay them. The only preparation that matters is getting the perennial weeds out first, since the mulch suppresses what tries to germinate afterwards rather than what is already rooted.

Are bark chippings safe for children?

Bark sold for play areas is graded and tested for that use, so buy that and nothing else for anywhere children play or fall. With very small children, bark of any kind is a temptation for hands and mouths, which is worth weighing before you choose it at all.