Flushing plants before harvest.

Can someone give me an idea of when I should start to flush my plants, how do I judge when harvest will be within two weeks?

First you should kknow what strain it is because different strains finish flowering at different times... But you need to find out how long you have been in the flowering process right now and about how long this strain should be in flower.... Or you can look at the tri's if you have a microscope

check the trichome colour an pistil colour for harvesting requirements(stoned/high) and use only water for the last two weeks of flowering to flush any feed/chemicals.
flowering time is usually 8 to 10 weeks total.

K, I have my plants bent to keep them short but now although all the surface flowers are growing like colas the lower buds are only medium or small,..can I harvest the tops at 8 weeks then let the others catch some light for a bit longer?

LUDACRIS said:

check the trichome colour an pistil colour for harvesting requirements(stoned/high) and use only water for the last two weeks of flowering to flush any feed/chemicals.
flowering time is usually 8 to 10 weeks total.

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all your info is here?????????.