well consider you have no controll over the outdoor light hours


Here are the seasons of 2005:
solstice and equinox times
SPRING . . . March 20,
SUMMER . . . June 21,
.FALL . . . September 22,
WINTER . . . December 21,


http://www.almanac.com/rise/index.php

im not sure sure about cloning ,ive done it once
but i will give you a example for me on the east coast (wv)

i try to get a few of them out as early as possible becuase they are scattered far and wide for hopes of stealth,depending on actually the temps i will put some out first week of april,to try to get a jump on it,risking a cold week to come of rian,>??ya know .but by the end of april its warm enough.
i do most of my planting in may,right up to june if i have time and places to put any,wheather is the big factor more than a actuall date,
i can say this safe enough though when you see them folks planting corn
you should be getting right at it .
peace