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We have many articles with primrose pictures. Can you send me the link to the article with the picture that is in question? I will be glad to help.

As long as you are in the clear for a freeze then it would be safe to plant both of these. Lettuce can handle low temperatures, but a freeze will kill off a young seedling.

Here are two articles will help:

https://www.gardeningknowhow.com/edible/vegetables/lettuce/growing-lettuce.htm
https://www.gardeningknowhow.com/ornamental/flowers/primrose/growing-primrose-primrose-plants-in-your-garden.htm

Primrose. There are several plants with "primrose" in their name. Evening primrose has both annual and perennial varieties. Spring blooming Primula polyantha, a flower that goes dormant in summer is more widespead in gardens. Morning sun and moist soil are good for the latter primrose. But because it goes dormant, it doesn't help fill in your garden bed. Look into rock rose if the area is dry. It is an annual that often self sows. (https://www.gardeningknowhow.com/ornamental/shrubs/rockrose/how-to-grow-rockrose-shrubs.htm). Other ideas include asiatic lilies, Salvia, and coral bells; however I don't know your hardiness zone so research plants carefully. More ideas are here: https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-4/gardening-in-zone-4.htm

I would look for small garden fencing; available at most garden centers.
You can buy small sections that easily poke into the the ground.

That's not a bad problem to have. Perhaps you are deadheading yours or cutting them back in late summer, which would promote a fall flush. In the wild, there is no one cutting them back so blooming ends after one cycle.
In the article below, it says primrose may continue to bloom throughout the summer and in some areas into the fall.

https://www.gardeningknowhow.com/ornamental/flowers/primrose/growing-primrose-primrose-plants-in-your-garden.htm

You can, but you will need to plant that pot into one that won't break down, or it will fall apart after several waterings.

This article will help you to care for them:

https://www.gardeningknowhow.com/ornamental/bulbs/tuberose/tuberose-plant-info.htm