If your seeds are new, count on a high germination rate that approaches 85%. However, since it takes almost 2.5-3 weeks for seeds to germinate, the exact rate you have depends on whether you keep the soil moist for that time and the temperature. Ideal temp is 70-75 degrees so if your area is colder at night, you may want to start them indoors. Colder temps lead to longer germination times and a lower germination rate. https://www.gardeningknowhow.com/ornamental/flowers/impatiens/germinating-new-guinea-impatiens.htm
Answered on October 20, 2018
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