does any1 know at what stage in flowering is it too late to take cuttings..

i usually wait till my plants are 2wks into flowering b4 i take my cuttings but just want to know if i can go beyond this.
ive had a great success rate (90%).
any info would be great.

thanx

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http://www.rollitup.org/grow-journals/49770-white-widow-bigbud-afghani-hydro.html
every thing i say is all lies and all the pics ive posted are all stolen from other ppl.