When to Start Your Seeds
When sowing seeds either indoors or out, it is important to know the average date of the last spring frost for your area. In New York City, this date is approximately May 15th. Perennials should be planted ten to twelve weeks before this date; most annuals can be planted four to six weeks before the last frost, and the dates for vegetables range from four to ten weeks, depending on what you are planting. 

See even more from our informative guide.

Courtesy of the NYBG Plant Information Service