Choosing the best compost can make all the difference to the health and growth of your plants. Whether you're sowing seeds, filling containers or improving your garden borders, using the right compost gives plants the nutrients and structure they need to thrive. In this guide, we'll explain the different types of compost, which compost is best for different plants and how to choose the best compost to buy for your garden.
Types of Compost Explained
Multipurpose Compost
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A versatile option suitable for most plants.
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Contains a balanced mix of nutrients but may not be ideal for specialist plants.
Peat-Free Compost
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Environmentally friendly alternative to traditional compost.
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Varies in texture and nutrient content, making it important to choose a high-quality brand.
John Innes Compost
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A specially formulated mix containing loam, sand, and peat.
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Available in different grades for various plant stages:
- John Innes Seed Compost – Low in nutrients, perfect for germination.
- John Innes No.1 – Gentle mix for young seedlings.
- John Innes No.2 – Balanced nutrients for established plants.
- John Innes No.3 – Nutrient-rich for mature plants and long-term potting.
Ericaceous Compost
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Acidic compost designed for plants that thrive in low-pH soil, such as rhododendrons, camellias, and blueberries.
Why is Compost So Important?
Compost plays a crucial role in gardening by improving soil health and providing essential nutrients for plant growth. It enhances soil structure, helping it retain moisture while also allowing excess water to drain effectively.
Good compost also introduces beneficial microorganisms that break down organic matter, making nutrients more accessible to plants. It helps suppress plant diseases and reduces the need for chemical fertilisers, making it an eco-friendly choice for gardeners.
Best Compost for Different Needs
What compost do seeds & cuttings need?
Seeds and cuttings need compost that supports early root development without overwhelming young plants with excess nutrients. John Innes Seed Compost or a fine-textured Multipurpose Compost is ideal because it provides excellent drainage and contains low nutrient levels, preventing root burn while encouraging strong germination.
What compost do vegetables & herbs need?
For vegetables and herbs to thrive, they require nutrient-rich compost that promotes healthy foliage and fruiting. Organic compost or vegetable compost is ideal, as it contains natural nutrients that improve soil structure and support robust growth. These composts also help retain moisture, reducing the need for frequent watering.
What compost do pots & containers need?
Plants grown in pots and containers have limited access to nutrients, so they need compost that retains moisture while providing slow-release fertilisation. John Innes No.2 or No.3 or a Moisture Control Potting Compost works well, as it contains loam for stability and added nutrients to support plants over an extended period.
What compost do hanging baskets need?
Hanging baskets are prone to drying out quickly due to exposure to wind and sun. A lightweight, moisture-retaining compost with added slow-release fertiliser is best. These composts contain water-absorbing granules that help keep plants hydrated, reducing the need for constant watering while supporting continuous flowering.
What compost for borders & beds need?
Garden borders and flower beds benefit from compost that improves soil fertility and structure. Soil-based compost or Multipurpose Compost with added loam enriches the soil with organic matter, promoting strong root establishment and long-term plant health. This type of compost also enhances drainage in heavy soils and helps retain moisture in sandy soils.
What compost do acid-loving plants need?
Plants like azaleas, camellias, and blueberries require acidic soil conditions to absorb nutrients properly. Ericaceous Compost is formulated with a lower pH, ensuring these plants can thrive. Using the wrong compost can cause yellowing leaves and poor growth, so it’s essential to provide the correct soil conditions.
What compost do roses & shrubs need?
Roses and shrubs need compost with plenty of nutrients to support long-term growth. John Innes No.3 or a Rose, Tree & Shrub Compost is ideal, as it contains a high amount of loam and slow-release nutrients. This compost provides a stable base for strong root development while ensuring plants receive sustained nourishment.
| Plant | Best Compost |
| Seeds | John Innes Seed Compost |
| Houseplants | Multipurpose Houseplant Compost |
| Vegetables | Vegetable Compost or Organic Compost |
| Roses | John Innes No.3 |
| Hanging Baksets | Moisture retaining compost |
Peat-Free vs Peat-Based Compost
Peat-based compost has been a popular choice for gardeners due to its excellent moisture retention and ability to provide a stable growing environment. However, the extraction of peat from bogs contributes to habitat destruction and releases carbon dioxide, impacting climate change.
Pros and Cons of Peat-Based Compost
Pros:
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Excellent water retention
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Provides a consistent growing medium
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Contains natural nutrients
Cons:
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Environmentally harmful due to peat extraction
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Non-renewable resource
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Alternative composts can provide similar benefits
Pros and Cons of Peat-Free Compost
Pros:
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Sustainable and eco-friendly
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Often made from renewable resources like coir, bark, and green waste
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Supports biodiversity
Cons:
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Quality can vary between brands
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May require additional nutrients for certain plants
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Some blends retain moisture differently than peat-based options
Homemade Compost vs Store-Bought
Another great option is to make homemade compost at home or at an allotment. It's an excellent way to recycle organic waste and create nutrient-rich soil for your garden.
By composting kitchen scraps, garden waste, and other biodegradable materials, you can reduce landfill waste while improving soil fertility. However, it requires time, space, and careful management to ensure a balanced mix of green (nitrogen-rich) and brown (carbon-rich) materials.
Pros and Cons of Homemade Compost
Pros:
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Free and sustainable
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Reduces household waste
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Customisable for specific gardening needs
Cons:
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Takes time to decompose properly
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Can attract pests if not managed correctly
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Requires space for a compost bin or pile
Both homemade and store-bought compost have their advantages, and many gardeners use a combination of both for the best results.
Visit the Only Compost Drive-Thru in the South West!
Once you've decided which compost is right for your plants, visit our unique Compost Drive-Thru. Our team can help you choose the best compost for your garden, load it straight into your car and have you back on your way in minutes.
FAQs
What is the best compost?
The best compost depends on what you're growing. Multipurpose compost is suitable for most plants, while specialist composts such as John Innes, Ericaceous and Seed Compost are better suited to particular plants.
What is the best compost to buy?
Look for a high quality compost that is suitable for your plants. Peat free comppst is now a popular choice, while specialst composts provide the best results for roses, veegtables, houseplants and acid living plants.
Can I use multipurpose compost for everything?
Multipurpose compost is suitable for a wide range of plants, making it one of the most versatile compost types availiable. It's ideal for containers, baskets, borders and many shrubs and flowers. However, specialist plants such as blueberries, rhododendrons and camellias require ericeceous compost, while seedlings and cutting benefit from seed compost. Using the correct compost for these plants woll often produce healthier growth and better results.
Which compost is best for pots and containers?
the best compost for posts and containers is one that retains moisture while providing a steady supply of nutrients. John Innes No.2 or No.3 compost is an excellent choice for established plants, while moitsure retaining composts help reduce watering during warmer weather. Regular deeding throughout the growing season will also helo keep container plants looking their best.
Which compost is best for vegetables?
The best compost for vegetables is nutrient rich compost that encourages helather roots, leaves and crops. Multipurpose compost works well for many vegetables, while specialist vegetable compost or homemade compost can provide additional organic matter and nutrients. Mixing compost into garden soil before planting also helps improve soil structure and moisture retention.
What is the difference between peat-free and peat-based compost?
Peat-based compost has traditionally been valued for its consistency and moisture retention, but harvesting peat dammages valuable peatland habitatis and releases stored carbon into the atmosphere. Peat-free compost is made from suitable materials such as composted bark, wood fibre, coir and greenwaste. Moderns peat free composts have imporved significantly and are now an excellent choice for post gardening jobs.
How do I know compost is right for my plants?
The easiest way to choose the best compost for your plants is to consider what you're growing. Seedlings and cuttings need low nutrient seed compost, flowering plants thrive in nutrient rich compost, acid loving plants require ericaceous compost, and mature shrubs and roses benefit from John Innes No.3. If you're ever unsure, our team at Almondsbury Garden Centre will be happy to recommend the right compost for your garden.