Rosemary is a perennial shrub and usually grows to about 1 metre (3.3 feet) in height, though some plants can reach up to 2 metres (6.6 feet) tall. The linear leaves are about 1 cm (0.4 inch) long and somewhat resemble small curved pine needles. They are dark green and shiny above, with a white underside and curled leaf margins. The small bluish flowers are borne in axillary clusters and are attractive to bees. Rosemary is fairly resistant to most pests and plant diseases, though it is susceptible to certain fungal infections, such as powdery mildew, in humid climates. It is also a common host to spittlebugs. The plants are easily grown from cuttings.