Leaves which are of two distinct colours are called variegated. They might be edged, striped or dotted with a second colour. A good example is variegated holly – which is edged with cream, silver or gold.
This word is often used in place of the word ‘cultivar’ and it simply means a plant which has evolved slightly differently and therefore may have slight differences aesthetically or in growing habits to the original plant. Sometimes plants are cultivated specifically to create new varieties.
This is a term that is important for indoor gardening and greenhouses. Plants often need a certain degree of ventilation when growing indoors – this means air needs to flow around the plant to regulate the temperature and help growth.