When you plant outside,usually after all danger of frost.The other solution is you start the seeds indoors and transplant them outside after all danger of frost.Without knowing your location and what seeds you are planting it is difficult to be more specific.Local garden centers can usually give more info.
The best time is during Spring.
early spring
Spring
The time you plant flowers depends on the type of flowers you are planting. An almanac can help you determine the best times to plant anything.
Spring
I would say the best time to plant is early spring or early fall, however spring would best for early blooming.
The best time to plant vegetables is generally in the spring.
It is best to plant lilies in the fall but you can plant them in spring.
The best time to plant the strawberries in Pakistan is Spring season.
The best time to plant flowers depends on where you are, and what the temperatures are in your area. Certain flowers can withstand cooler temperatures than others, but most flowering plants perform best when planted when temperatures no longer get near freezing at night.
Do it like 5 seconds.
The best time to plant soybeans is in the spring, generally around the end of April or the beginging of May for Midwest farmers.