Greenhouses can be a haven for pests and disease if you don’t keep on top of them. The main active pests in greenhouses in summer are red or two-spotted spider mites, whitefly, scale and mealybug.

Need advice on what to plant in a greenhouse? If you've recently invested in one of these garden structures, you'll be pleased to know that there are plenty of grow-your-own options. And if you're ...