What is the waxy surface covering the skin of the grape known as?

The waxy surface covering the skin of the grape is referred to as the bloom. This bloom serves as a protective layer, guarding the grape against various environmental factors, such as moisture loss and pests. It is produced naturally by the grapevine and consists of various lipids and waxes that contribute to the grape’s overall health and ripening process.

The bloom plays a crucial role in the preservation of the grape's integrity, helping to maintain its flavor and aroma compounds while also providing a barrier against undesirable microorganisms. Understanding the significance of the bloom can enhance a winemaker's knowledge of grape health and the potential quality of the wine produced.