Hydrangea plants are a highly popular ornamental shrub, most known for their prolific and colourful blooms. Interestingly, the colour of these flowers will vary depending on the soil pH. Hydrangeas growing in acid soil will be blue, while Hydrangeas in akaline soil tend to be pink.

The flowers of Hydrangea plants can also be mophead or lacecap. Mophead flowers are abundant and full, while lacecap flowers have flatter and more intricate appearance.