Answer: Petunia seeds germinate in 10-21 days with bottom heat. The hybrids and doubles need 80F to germinate. You can provide extra heat by placing the seed flats on a heating cable.<br>The seeds also need light to germinate so just sprinkle them on the top of the soil and press them in with the flat of your hand. Keep the medium moist and cover the flats with plastic wrap to help control the humidity. Remove the plastic when the seeds have germinated.<br><br>Better luck with your next crop!
Q&A Library Searching Tips