Walleriana Baby Pink Impatiens bloom in a lovely shade of pink. Packet of 30 seeds. Impatiens require warm soil (75 degrees F) and light to germinate. Sow Impatiens seed in a peat-light mix or sterilized well-aerated soil mix. Sow the seed thinly, by pressing the seed into the starting mixture—do not cover the seed with starting mixture. Cover loosely with plastic wrap to hold in humidity. Once all danger of frost has passed, you can plant your impatiens seedlings out in your garden. Impatiens plants enjoy moist but well-draining soil and partial to deep shade.