Harris Seeds Petunia Sophistica

They are straightforward, but they do require specific conditions. You will need to maintain a soil temperature between 70-75°F for successful germination, which typically takes 7 to 12 days.

Petunia seeds are naturally tiny and difficult to handle. The pelleted coating makes them larger and easier to see, allowing you to sow them precisely without wasting seeds.

While possible, these are designed for transplanting. Starting them indoors and moving them outside once established ensures better control over their environment and more reliable, uniform growth.

Each plant grows to about 12-15 inches tall and spreads 10-12 inches wide. They work best when given enough room to maintain their upright, lush habit without overcrowding.

Because they are bred for uniform flowering, they are quite reliable. However, like most grandiflora petunias, they perform best with consistent watering and regular feeding, especially when grown in containers or hanging baskets.