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Petunias come in an incredible range of colors, but night sky petunias might be the most breathtaking. Big blooms in shades of deep purple, red, burgundy, and pink are spangled with white flecks to create an effect not unlike looking up at a beautiful starry sky. Plant these gorgeous, low-maintenance flowers in flower beds, containers, or hanging baskets. The blooms start in summer and can last until the first frost in autumn.
- Botanical Name: Petunia 'Night Sky'
- Common Name: Night sky petunia, starry sky petunia, galaxy petunia
- Plant Type: Herbaceous perennial
- Mature Size: 14 inches tall and 30 inches wide
- Sun Exposure: Full sun
- Soil Type: Moist, well-drained soil
- Soil pH: 5.5 - 6.0
How to Grow a 'Night Sky' Petunia
Petunias are annuals, so they only last the growing season. Luckily, once they bloom, they will keep blooming for months until the first fall frost. "Night Sky" petunias tend to start blooming in the summer and continue into the fall. Plant them in a sunny location with at least six hours of direct sunlight a day. Any less and your plants will produce fewer flowers.
Petunias are drought tolerant, but don't like to be planted in moist soil, so if you're growing in a yard, be sure to choose a well-drained spot. If you are planting them in containers or hanging baskets, allow the top of the soil to dry out before watering again (some growers may require daily watering).
Since petunias require a lot of energy to bloom almost constantly, they also need to be grown in rich soil rich in organic matter to provide the nutrients they need. Fertilizing them regularly will also help the plants continue to bloom; use a balanced 10-10-10 fertilizer every two weeks for containers and every three weeks for petunias planted in the garden. They shouldn't need too many dead spots, as used flowers usually fall off on their own, but you can give it a light pruning mid-season if the stem starts to grow too long.
The pattern on each "Night Sky" flower changes with temperature, so many of your blooms may change as the growing season progresses. Generally speaking, lower temperatures will produce more white spots, while higher temperatures will result in more purple petals. Typically, you'll see the Milky Way flowers swirling with the most "stars" in the fall as the weather starts to cool.