Best compost: which compost is best for which job? (2024)

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For most plants, and for many seeds and cuttings, a good peat-free multi-purpose compost is suitable, both from an environmental and convenience point of view.

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Multi-purpose composts are soil-less, so they shrink more than loam-based composts when they dry out, and don’t always reabsorb water when wetted. It's therefore important to keep the compost gently moist at all times and don’t let it dry out.

The nutrients are also more rapidly leached out of soil-less composts than those containing loam. Read the bag for how long the nutrients are expected to last, but you will usually need to start applying a fortnightly liquid feed six weeks after planting plants that are in growth. For trees and shrubs in containers outdoors, use John Innes soil-based compost, which has the weight necessary for stability and the ability to hold onto its nutrients for longer – add grit to prevent it from becoming too hard and ‘claggy’.

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If you're determined to avoid peat, the alternative is to mix a peat-free, multi-purpose compost with good-quality topsoil, to provide stability and moisture retention, and add fertiliser, such as blood, fish and bonemeal. Proprietary compost is tested to make sure it's suitable for a range of plants. Yours will be a process of trial and error, but you will have the satisfaction of knowing you're doing your bit for conservation.

For acid-loving plants, such as rhododendrons and camellias, use John Innes ericaceous compost or mix a peat-free ericaceous compost with neutral or acidic topsoil.

If you want to make your own compost from kitchen or garden waste, try our guide to the best compost bin as we talk through all the available options, the benefits of each and share advice on how to get started. For any additional help you may need, we also have a trouble-shooting video on common problems with composting.

Whatever compost you choose, for best results always buy fresh bagged compost rather than an old, stale or waterlogged sackful. Only buy as much as you can use within six to eight weeks, and seal after use to stop bugs and weed seeds getting in, and prevent decomposition. Store it where it won’t get waterlogged.

Find out which is the best compost for which job, below.

Sowing most seeds

Best compost: which compost is best for which job? (1)

Use peat-free, multi-purpose compost.

Buy Peat-Free Multi-Purpose Compost from Amazon

Potting on plug plants

Use peat-free, multi-purpose compost.

Buy Peat-Free Multi-Purpose Compost from Amazon

Rooting cuttings

Best compost: which compost is best for which job? (2)

Use peat-free, multi-purpose compost with half as much vermiculite or perlite added.

Buy Peat-Free Multi-Purpose Compost from Amazon

Buy Vermiculite from Amazon

Plants in pots for less than a year

Best compost: which compost is best for which job? (3)

These include hanging baskets, summer bedding and veg. Use peat-free, multi-purpose compost.

Buy Peat-Free Multi-Purpose Compost from Amazon

Plants in pots for more than a year

Use equal parts of peat-free, multi-purpose compost and John Innes No.3, or a good topsoil if you want to avoid peat.

Buy Peat-Free Multi-Purpose Compost from Amazon

Buy John Innes No.3 from Amazon

Large plants in large pots kept outdoors for several years

These include shrubs and fruit. Use John Innes No.3 with one quarter its bulk of added grit, or a good topsoil if you want to avoid peat.

Buy John Innes No.3 from Amazon

Acid-loving plants

These include rhododendrons and camellias in large pots. Use John Innes Ericaceous Compost or a peat-free ericaceous compost.

Buy John Innes Ericaceous Compost from Amazon

Cacti and succulents in pots

Use John Innes No.1 with grit added until it feels crunchy, or a bespoke cacti compost.

Buy Westland Cacti & Succulent Compost from B&Q

Orchids

Best compost: which compost is best for which job? (4)

The epiphytic types (those that cling to trees for support) are best potted into chipped bark especially for the purpose.

Buy Orchid Bark Chips from Amazon

Most houseplants

Use peat-free, multi-purpose compost (except for cacti, other succulents and orchids).

Buy Peat-Free Multi-Purpose Compost from Amazon

Adding to planting holes

Use well-rotted garden compost or manure, but many gardeners now recommend simply enriching the soil in the area where you will dig the hole.

Buy Horse Manure Soil Conditioner from B&Q

Mulching beds

Best compost: which compost is best for which job? (5)

Use well-rotted garden compost or manure, or composted or chipped bark (the latter is longest lasting).

Buy Horse Manure Soil Conditioner from B&Q

Buy Bark Chippings from B&Q

Lawn repair

Use good-quality screened (sieved) topsoil.

Buy Top Soil from B&Q

Filling raised beds

Use screened topsoil with well-rotted garden compost or manure added.

Buy Top Soil from B&Q

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Best compost: which compost is best for which job? (2024)

FAQs

Which type of compost is the best? ›

Blue Ribbon Compost is great for vegetable gardening as it regenerates soil by improving aeration, increasing water retention, buffering pH, adding organic matter, and key nutrients including: nitrogen, phosphorus, potassium, calcium, and magnesium.

Which compost is best for all plants? ›

Multi-purpose or all-purpose peat free compost

As the name suggests, this compost has many uses. A good quality peat free compost such as Miracle-Gro Premium Peat Free, can be used for pots and containers, planting in beds and borders, sowing larger seeds and taking cuttings as well as for growing fruit and vegetables.

Which is best, compost or manure? ›

Both compost and manure have their benefits however, for the average homeowner growing in your garden, compost is a much better solution to support a healthy garden. If you would like to find out more about how our experts could help you then get in contact with us on 01483 299 797 or fill out a contact form here.

What is the perfect compost? ›

The ideal ratio of Carbon to Nitrogen (C:N) is 30:1 (30-parts carbon material to 1-part nitrogen material). Good compost is produced by blending compostable materials like leafy 'green' matter with harder 'brown' matter. 'Green' matter includes grass clippings, kitchen scraps, and soft green prunings.

What compost do professional growers use? ›

Bulrush professional peat based compost is used by nurseries and professional growers to give excellent plant growth, flowering and fruiting. This is a premium grade, professional multi-purpose, peat based compost which is ideal for use in hanging baskets, pots and containers too.

What's the best compost for a vegetable garden? ›

Which Compost Is The Best For Vegetables? There is no definitive answer to this question as the best compost for vegetables will vary depending on your individual gardening needs. However, some of the more popular types of compost include organic compost, peat-free compost, mushroom compost, and loam-based compost.

Can plants grow in 100% compost? ›

Compost is one of the best garden amendments available. You can plant in straight compost, but I suggest incorporating it into your sandy garden soil or mixing it with other additives if you want to use it for container plantings.

Which plants love compost? ›

Along with tomatoes, as discussed above, pumpkins and squash are two other crops that can do well growing in pure compost. Squash plants are more sprawling than tall, growing close to the ground along vines, and they need well-draining soil.

What is better than compost? ›

It will decompose over time and release nutrients into the soil. Compared to compost, topsoil is much better at holding onto its structure and moisture. To add bulk to raised beds, flowerbeds, or garden beds, topsoil may be utilized (but compost is preferable if you're just making a small area or raised bed).

What is the downside of manure? ›

Disadvantages of Manure

The manures are reported to provide fewer nutrients to plants, and they are unable to provide high-yielding crops. Manures are slowly absorbed by the plants, and they add a lot of humus to the soil. They are made in fields, so transportation is difficult for manures.

Should I add manure or compost to my garden? ›

Growers should either 1) use properly composted or otherwise sterilized manure (from a commercial source or your yard) for application during the current growing season, 2) apply non-composted manure in the fall before crops are planted the next spring, or 3) apply non-composted manure as soon as possible in the spring ...

What is the best compost for beginners? ›

Try to get between 25 and 50 percent soft green organic matter — vegetable kitchen waste, grass clippings, weeds. The rest of your compost heap should be comprised of brown waste, woody material like paper, cardboard, dead leaves, and pruned yard waste. Try not to let one material dominate the heap.

What are 3 things you shouldn't compost? ›

Composting Don'ts

Don't add fish, meat, dairy products, bones, baked goods, fatty foods or grease to your compost pile. These food scraps do not easily decompose and may attract animals. Don't use diseased plants or plants that are toxic to other plants.

What is the best compost combination? ›

Aim for a 50:50 Mix of Greens and Browns

Think grass clippings, spent crops, old bedding plants, annual weeds (seed-free so you don't inadvertently spread them about in the final compost), and kitchen waste such as vegetable peelings and fruit peels.

What is the best compost method for a garden? ›

Trench and pit composting are pest-resistant versions of the heap that put the finished compost right where you'll grow. Dig a trench or a hole a few feet deep. Fill it with organic waste and cover it with at least six inches of soil. The bacteria and worms will start breaking down your waste in no time!

Is mushroom compost better than normal compost? ›

Mushroom compost has already been used as a growing medium which means it generally contains less nitrogen than regular compost. It may be a good choice for soil already rich in nitrogen since excess nitrogen can lead to overgrowth of foliage and stunted roots.

Is home compost better than commercial compost? ›

Home composting cannot process as many types of organic matter as commercial composting can. Some materials, like compostable foodservice products, will not decompose fully in an at-home composting pile. Compost made in a commercial composting site can be resold into the community and used to fertilize soil.

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