The "Mars" grape is a cultivar of the European grape species Vitis vinifera. Here are some key features of the Mars grape:

1. Origin: The Mars grape was developed by Elmer Swenson, a renowned grape breeder from Wisconsin, United States, in the 1960s. It is a hybrid grape variety resulting from a cross between the variety 'Muscat Hamburg' and another hybrid grape variety called 'Unknown.'

2. Fruit: Mars grapes produce medium to large-sized berries that are dark blue to black in color when ripe. The berries have a distinct musky flavor with a hint of spiciness, reminiscent of the Muscat Hamburg parentage. The fruit is typically used for making wine, although it can also be enjoyed fresh if desired.

3. Growth Habit: Mars grapevines are vigorous and can grow well in a variety of climates, including cooler regions. They are known for their hardiness and disease resistance, making them suitable for both home gardeners and commercial vineyards.

4. Climate Requirements: Mars grapes thrive in temperate climates with warm summers and cool winters. They prefer well-drained soil and full sun exposure to achieve optimal growth and fruit production.

5. Wine Characteristics: Mars grapes are primarily used for making red wine. Wines produced from Mars grapes tend to be medium to full-bodied with deep coloration and complex flavors. They may exhibit notes of dark fruits, spices, and floral aromas, reflecting the grape's Muscat heritage.

6. Harvest Time: Mars grapes typically ripen in late summer or early fall, depending on the specific growing conditions and climate of the region.

7. Cultural Practices: Proper vineyard management practices, including pruning, trellising, and pest/disease control, are essential for ensuring healthy grapevines and optimal fruit production.

Overall, the Mars grape is valued for its unique flavor profile and adaptability to various growing conditions. It is a versatile grape variety that can be used for making a range of wine styles, from single-varietal bottlings to blends.