How to care for dahlias through the year: • pot them up into 15-20cm diameter pots using multipurpose compost between February and mid May. Grow them in a greenhouse or outside in a sunny position and protect from frost when needed. • water straight after planting, but not again until the soil feels quite dry. Water more frequently when they start to grow. • when they have grown to 20-30cm tall, transfer them into borders. • enjoy flowers between July-October, deadhead them regularly to encourag