I deadheaded all my marigolds last year and have planted them in seedling trays by the color of their blossoms. All but one have sprouted. Can some varieties take much longer than others? It looks like I'll have lots of yellow, small and large orange flowers, but may not get any of the bi-color dark orange.
Certified GKH Gardening Expert
It may be that some of the varieties you harvested were hybrids, which will not germinate. Bi-color marigolds especially tend to be hybrids. These need to be propagated by other methods.