Read on to discover how to care for your succulent when temperatures drop, why forty degrees is a point of no return for succulents, and what other temperatures pose problems for these plants. During the cooler months, the plant can grow quite happily in temperatures that are as low as 40 degrees Fahrenheit, whereas, during the summer, the string of dolphin succulents can withstand temperatures as high as 80 degrees Fahrenheit. It may seem labor-intensive but E. Enopla seeds can be quite difficult to locate. You might also consider collecting your own seeds if you already have them.