Planting on Good Friday? Risk of Blackberry Winter?

Felder Rushing, our well-known Mississippi horticulturalist and author of 15 gardening books, wrote in his newspaper column today the following advice: While our northern garden brethren wait until Memorial Day to set out their summer flowers and vegetables, our traditional benchmark for planting is Good Friday....the day after tomorrow. This year it's really early....only folks 95 years or older have experienced it this early, and it will be 220 years before it is this early again. But this time around it may be a tad early to plant, considering the risk of "blackberry winter"....a late frost in late March or even in early April. http://www.felderrushing.net Click Felder's link. His site is unusual and interesting.