Place the impatiens plant in a hole that is at least as deep and wide as the rootball. The plant should sit at the same level in the ground as it did in the pot. Gently backfill the hole and water the impatiens plant thoroughly. You can plant impatiens flowers quite close to one another, inches apart if you like.mpatiens plants in containers will need watering daily and watered twice a day when temperatures rise above 85 F. (29 C.). Impatiens flowers do best if fertilized regularly. Use water soluble fertilizer on your impatiens every two weeks through spring and summer.