Can you tell me what’s wrong with my marigolds?

Can you tell me what’s wrong with my marigolds?

This is the second time I've planted marigolds in my border. The first time I put down their demise to it being too early and too cold. This time, however, the weather is fine but they are not doing too well. The leaves and stems have turned red with some spotting and the flowers are... not happy. Sick marigold I planted a dozen plants (3 different varieties). Most were purchased but 3 I grew from seed. All are turning red and have spots. Anyone have a clue?
The tomato is energetic.

The tomato is energetic.

living room & kitchen.

living room & kitchen.

Another Mystery Plant

Another Mystery Plant

Stupid Gardener Tricks

Stupid Gardener Tricks

My room

My room

Habaneros and Amaryllis

Habaneros and Amaryllis