Q.zinnia from seed
Full sun – planted seed in flower bed. Covered with little mulch to keep weeds out. Some of the seed sprouted and first set of leaves but have not gotten any bigger. Planted in early May. We have had spells of lots of rain so have not been watering if they got rained on.

How healthy do the seedlings look? How tall are they? Are there any signs of distress at all (wilting, curling, discoloration, mildew, etc.?) Excessive rain on plants promotes disease often evidenced in stunting, spots on foliage, decay on leaves, stems or fruit, wilting and, in severe cases, death of the entire plant.
https://www.gardeningknowhow.com/plant-problems/environmental/excessive-rain-on-plants.htm
For more information on the care of zinnias, please visit the following link:
https://www.gardeningknowhow.com/ornamental/flowers/zinnia/growing-zinnia-flowers.htm