Simplify the following text for a Grade 6 native English-speaking person.
Original: It also thrives over the summertime in the central and northern United States , but dies out when temperatures reach freezing point , to grow again the next year if allowed to go to seed .
Simplified: It also thrives over the summertime in the central and northern United States , but dies out when temperatures reach freezing point . It will grow back the next year if allowed to go to seed .