Each seed one plant?
HI, I'll grown New Guinea impatient directly on my landscape. I would like to know, how many seeds I need to grown one plat, just one seed per plant or more?
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