By Zahna Eklund Orchids are notoriously difficult to care for – but one easy trick could guarantee new flowers. With their beautiful flowers and stunning colours, it’s no wonder orchids are one of the most popular plants for keen gardeners to bring home. The plants are available at garden centres and supermarkets, and they make an excellent display piece on a table to brighten up your living room – but caring for them can be tricky. Many of us buy orchids when they already have flowers, which can make it hard to know what to do with the plant once it’s finished blooming for the year. But accor…