Q.My Marigolds In Containers Grew Tall But No Flowers At All! Help!
I did all the right things-sun, water, soil, etc. and they kept growing tall but no flowers at all. I had bought the seeds at amazon Marigold seed mix Nature z. I knew what to do. Two years ago I grew marigolds from seeds and I had gorgeous and plentiful flowers. So what happened and what can I do about it? I can send you a photo from my hone, but I don’t know how to upload it here.

Certified GKH Gardening Expert
Some common reasons they don't bloom include too much fertility, not enough sun, or waterlogged soil. Here is more:
https://www.gardeningknowhow.com/ornamental/flowers/marigold/marigolds-will-not-bloom.htm
https://www.gardeningknowhow.com/ornamental/flowers/marigold/growing-marigold-flowers.htm