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
A magical gift that grows all year
020 3176 5800
Mon – Fri | 9am – 5pm
Make a donation
Join the RHS today and support our charity
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.
Browse all our advice on plant care
Find out how to get the best from your garden, from choosing good plants, to controlling troublesome pests and diseases.
Acacias are attractive trees and shrubs grown for their sweetly-scented, tiny yellow flowers. Commonly known as mimosa or wattle, mature plants need minimal pruning, but young plants need more care to establish an attractive shape.
Agapanthus (African lily) are summer-flowering perennial plants, grown for their showy flowers, commonly in shades of blue and purple, but also white and pink. They thrive in any well-drained, sunny position in the garden, or grow these beauties in containers.
Air layering is a method of propagating new trees and shrubs from stems still attached to the parent plant. The stem is wrapped with damp moss to encourage roots to form.
Algae, lichens, liverworts and moss are often found growing in damp or shady places in the garden on plants, soil and hard surfaces. They do not cause any harm, and can usually be tolerated as they can give a mature look to a garden. But they can make paths and lawns slippery and make ponds and borders unsightly so control is sometimes necessary.
Alliums, also known as ornamental onions, are grown for their showy flower heads, which come in wide range of sizes and shades of blue, purple, white and yellow. Even when the plants die back, the dried flower heads look attractive in the garden, or can be cut for indoor display.
Finding an allotment and readying it for cultivation can seem a daunting task, but with these simple steps a productive plot is easier than you might think.
Alpine plants thrive in the well-drained crevices of dry stone walls and along their top where the foliage and flowers can be seen to their best effect.
Alstroemeria are tuberous perennials originating from South America. They are a great addition to borders combining well with other plants and making excellent cut flowers. Alstroemeria are free flowering, producing attractive flowers in a wide range of colours from June until the first frosts.
Apples are easy to grow, productive, and there are cultivars, shapes and sizes for every garden. They can be susceptible to a range of pests (such as the woolly aphid pictured below), diseases and disorders, but in most cases action can be taken to prevent or control the problem. Susceptibility to the problems differs between cultivars – you would be very unlucky to have a tree that suffers from all of the problems listed below!
Here we give answers to many of the common problems encountered. They are grouped by the area of the tree affected: shoots; leaves and flowers.
Apples are easy to grow, productive and there are varieties and growth forms for every garden. You can even grow them in containers. They should be valued as a long term investment as they take a few years to crop, but once they start, they will do so for many years.
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