420 Magazine's Official Girl Scout Cookies Comparative Grow By Brett Blaze

Elevated Lighting Company · Jul 14, 2021

It is neat to see the variance in the leaves. The ladies are stacking nicely.

I have personally grown a few different variations to GSC. Interested to see the final bud.

Furcifer · Jul 14, 2021

Nice update on the fertigation process. Looks great with girls moving in the right direction. Fat and Happy!
Your doing a bang up job!

Prescription Blend · Jul 14, 2021

@Brettblaze have you considered lowering your starting nutrient mix ppm?

Azimuth · Jul 14, 2021

Two leaves show different phenotypes as well.

Brett Blaze · Jul 14, 2021

Prescription Blend said:
@Brettblaze have you considered lowering your starting nutrient mix ppm?

Thank you for the input.

I reduced the total starting solution ppm over a week ago when the yellow "streaks" showed up. I went from 1685 ppm to 1285 ppm by removing Terpinator and Cal-Mag. In the latest batch of solution I added the minimum Cal-Mal raising it to 1385 ppm.

I'm looking to reduce the output ppm difference from the input ppm. Output ppm minus input ppm needs to be 200 or less. So if I went down to 1200 ppm to start and my output was over 1600 ppm (400 ppm difference) there is still too high ppm in the runoff since it's still over 400 ppm difference. My output was at 2000 ppm last night even after lowering the input to 1285 ppm as a starting ppm and watering 4 times a day with plenty of runoff for over a week.

Current Solution:
Base tap water 165 ppm
@Prescription Blend Nutrient Solution 1120 ppm
Cal-Mag 100 ppm (3 ml per gallon)
Total Solution - 1385 ppm

I think the flush may help since the runoff number difference was cut in half after the flush and this morning it was at 200 ppm difference or less. Both plants looked fine this morning after 12 hours of light.

:peace:

Brett Blaze · Jul 14, 2021

Azimuth said:
Two leaves show different phenotypes as well.

Both leaning towards Sativa but #1 more so. Could be a reason for the color. Even the purple stem could be genetic and not an issue. Both produced multiple 13 finger leaves and remember #2 has twin buds on a few branches and some areas what looks like a triple bud. No twins on #1.

Brett Blaze · Jul 15, 2021

Daily Update -

Stage - Flower Day 29 - 80 days above ground
#1 Bloom Day 12
#2 Bloom Day 17

Fertigation has been pretty good and I finally have the output of each fairly equal. I have a new timer coming today with the ability to set seconds. Now that the output is fairly equal I can fine tune with the new timer. Total output was a little high so reducing the time by just a few seconds should get me close to my objective of 10% to 20% runoff.

Output ppm for last night and this morning continue to look good but near the limit to where need to still watch closely.

Last Night's readings: Input 1385 ppm.

Output #1 1550 ppm (165 over) #2 1625 ppm (240 over). a little high.

This Morning's readings: Input 1450 ppm. Not sure why the ppm increased overnight. I measured several times.

Output #1 1640 ppm (190 over) #2 1640 ppm (190 over). Both had the same output ppm.

Both ladies are the same height as the last few days so stretching may be over. #1 sits at 23.5" and #2 at 26.5". #1 stacking is starting lower as well.

I removed three front branches from #1 this morning that were m not going to stack.

Today's Photos: