Jim, Marigolds are warm weather lovers so sow the seeds just before the last date of average frost in your area. They prefer lean to average soil and don't believe those TV adds that recommend you hose your garden down with a chemical fertilizer. Too much nitrogen will keep them from blooming. Best And Happy Yardening, Nancy.
Planting Marigold Seed Outdoors
Question From: J. Marker - WASHINGTON
Q: When is it too early to plant marigold seed outdoors? Our temperatures are presently at a daytime high of 65-70 degrees and a nighttime low of 40+ degrees. I have already planted several seeds and can only assume worst case scenerio will be I'll have to re-seed again?