Question about Stretching

If your plant has just entered it's flowering phase, how much taller with it be when it's time to harvest? 20% 50% 100% or more? or less? I think my plant is a little confused outside its getting 14 hrs of light. It should reveg and stretch some more with the daylight hours increasing, but I don't think she wants to.

20 /50% taller unless you LST or scrog hope this helps

I'd say they usually at least double in size sometimes even triple. Depending on your light cycle though you can expect varying results. Plants that were allowed to stretch more in veg tend to stretch less in flower.

should I switch from veg nutes to blooming nutes now?

I don't usually just switch over myself. Instead I slowly feed less veg nutes while increasing the does of flower nutes. So maybe 75%veg-25% flower the week before the stretch, 50-50 the next week, 25-75, etc. When I get to full strength flower nutes I stay there unless the foilage begins to yellow, then I might hit them with a 50-50 again.

depends on strain but most plants will at least double durning flowering unless you veg the crap out of them for months...