German grapes from greenhouses have long ago been out-competed by cheap imported grapes. Part of the demise of that grape cultivation era also came about by the much feared powdery mildew, a disease which started in an English glasshouse around 1850. However, with the new resistant grapevine varieties, every enthusiast can again produce delicious table grapes under glass, on carports, porches, or in plastic greenhouse tents.
Particularly suitable varieties for greenhouse cultivation are "Blue Muscat" and "Birstaler Muscat," as they thrive without ever getting rainwater or dew on their leaves and without requiring sulphuric spraying. Their cultivation can be shared with other, low-light loving plants.