Its sounds like its most likely a strain related feature. Some strains of cannabis will flower without a change in light cycles. Some strains that originate closer to the equator dont experience a change in the cycles, therefor they flower basically when ever they feel its time...

However, this is very odd for a BigBud to do something like that. Are you 100% positive its a BigBud decendant? It could be mixed...Other than the strain being the case i cant think of any other explanation...

Did you top it? Toppin any cannabis plant usually causes it to flower...
GRB.4.Life Reviewed by GRB.4.Life on . Showing Sex At 1 Foot Tall I would like to post pic's but i have no camera nor a web cam.......My Big Bud Plant is about 2 months old ........But it wouldnt grow no more than a 1cm a day for first 1 1/2 month .Then shot up and now showing sex of female....(Was runt of the rest of germanated seed's)....All others are about 4 feet tall and showing sex of all female .....(Feminized Seeds ......From some site...Dont remember was stoned at time)...But its really weird i havent even put it in 12/12 cycle yet but bout to Rating: 5