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Petunia seeds are very small and fine, and can be difficult to handle. Here are some things to know about petunia seeds: Appearance: Petunia seeds are black in color, which can make them hard to see in soil. Germination: Petunia seeds need light to germinate, and should be sown thinly at a temperature between 65 and 75°F (18-24°C). Handling: Pelleted seeds are easier to handle, but they aren't always available. To make it easier to see where you've sown the seeds, you can mix them with a little sand. Uses: Petunias are popular for landscaping and garden design, and can be used in hanging baskets, troughs, or in borders. Blooming: Petunias produce non-stop summer color and are fragrant.