Help us achieve our goals:
make a donation »
Join the RHS today and support our charity
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
I have forgotten my password
Keep me signed in
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
See what events are on near you and browse your bookmarked pages.
Although it's simple to do, soil care reaps rich rewards
Whatever your soil type there will be plants that love it and treatment that will help it. Make sure you know what is best for your garden soil.
Fertilisers are concentrated sources of plant nutrients, usually in compact form such as pellets, granules, powders or liquids. They are used to improve plant growth and yields.
Soil can be wet because it is compacted, or because of a high water table, where the upper level of the ground water is near the soil surface. Clay soils are wet in winter and baked dry in summer. Unless you install drainage, you will need to work with your soil and choose plants adapted to wet conditions.
Green manures are fast-growing plants sown to cover bare soil. Often used in the vegetable garden, their foliage smothers weeds and their roots prevent soil erosion. When dug into the ground while still green, they return valuable nutrients to the soil and improve soil structure.
Most potting compost or media offered is soil-less and either based entirely on peat, has some peat in its formulation or is peat-free. There are advantages, however, to soil based media and John Innes mixes are widely used. Be aware though; currently offered JI composts may differ from the traditional product.
Liming garden soil reduces the acidity of the soil by increasing the pH level. Plants can’t get the nutrients they need from soil that is too acid, and some materials such as aluminium can be at toxic levels in very acid soils. The pH level is a number that describes how acid or alkaline a soil is and from this it is calculated how much lime is needed to reduce acidity.
Mulching is generally used to improve the soil around plants, but it also gives your garden a neat, tidy appearance and can reduce the amount of time spent on tasks such as watering and weeding. Mulches help soil retain moisture in summer, prevent weeds from growing and protect the roots of plants in winter.
Mushroom compost can often be bought cheaply in bulk for use as a soil conditioner or mulch. It is usually available as ‘spent’ mushroom compost, referring to the fact it is the compost left over from mushroom farming.
If plants fail to thrive, despite adequate soil preparation, watering and mulching, it may be a sign of a nutrient deficiency. Fruit and vegetables are particularly vulnerable, as are containerised plants and those growing in very acid or alkaline soils. Yellow or reddish coloured leaves, stunted growth and poor flowering are all common symptoms of nitrogen, magnesium or potassium deficiency.
Organic matter is a much used term that can refer to several things, and is easily confused with similarly named activities such as organic gardening. It is no surprise that gardeners are often confused by this very useful piece of horticultural shorthand.
For decades, peat-based potting composts have been used to raise and grow-on plants. Due to the concerns about the damage done to the environment, gardeners are now reaching for peat-free or reduced-peat products as an alternative.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.
Join the RHS today and get 12 months for the price of 9