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Let's assume they are receiving adequate water and fertilizer. Nemesia requires well-draining soil and watering too much will lead to root rot. I suggest you cut them back by 1/4. This should rejuvenate them. If you have the Sunsatia series, they may cease blooming when nighttime temps are over 70. If you are having brutal heat, move them temporarily will they get more shade. Here is more info on Nemesia: https://www.gardeningknowhow.com/ornamental/flowers/nemesia/nemesia-plant-care.htm

This plant should grow in full sun and have moist but well drained soil.
Keep plants well watered throughout the summer to maintain flower production.
With proper care it should bloom through summer and even into fall.

I didn't find it on a toxic list, but I did find a statement on a grower's website that said it is not recommended for consumption by animals or humans.

So, to be safe, I would not eat it.

It is, likely, overfertilization. Make sure to test the soil to ensure that it needs fertilizer before doing so. This will avoid issues in the future.

Here is an article that will help you to test your soil:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

Here is an article to help you to care for the plant:

https://www.gardeningknowhow.com/ornamental/flowers/nemesia/nemesia-plant-care.htm

I will assume that you are referencing Nemesia. There is an annual, and a tender perennial, depending on which you have. In all but the warmest climates, the perennial will act like an annual, so it is best to assume that anything you plant will act like an annual.

You can remove the plant when it dies off for the year.

https://www.gardeningknowhow.com/ornamental/flowers/nemesia/nemesia-plant-care.htm