Answer: It is probably the annual phlox that gives a germination temp of 55 degrees. It doesn't need light to germinate, but due to small seed size is only planted about 1/16 inch deep.
Perennial phlox germinates best at about 70 degrees and doesn't need light. Sow it at 1/16 inch also. It will most likely take longer to germinate.
Gilia is a hardy annual. It is commonly sown outdoors from fall to early spring. It can be grown indoors in a cool location. Cover seeds only about 1/8 inch.
Thanks for the question!
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