Growth has stalled

[CyberK]

Howdy, first grow and feels like the new growth sites (what is the proper terminology? Axillary buds?) has been stunted. Fan leaves continue growing but not much vertical growth after the 2nd topping. If pics suck I can get more/different angles. When I topped the first time they sprouted up really quickly to the 4th node. Now just seem to have stalled and it's been 2 weeks!

Here are the quick stats:
--Amnesia fems
--12dec: Put in soil (FFOF/Perlite)
--6jan: First nutes added (GH Flora Trio), feed about 1/3 of the gallon every 2-3 days
--13jan: 2nd round of nutes, feed about 1/3 of the gallon every 2-3 days
--15jan: First topping/lollipopping
--25jan: 2nd topping
--27jan: 2nd lollipop
--28jan: 3rd round of nutes, feed about 1/3 of the gallon every 2-3 days
--Lights are 23" from top of plants
--Watering in between feedings with CalMag
--Temp/rH good (with the recent cold blast we've been having, things haven't been 100% perfect but in the range mostly), measuring pH, PPM with every water/feed, 2 clip fans to circulate air
--Used a soil pH meter (not sure how reliable) to test, was a bit high at 7.5

Appreciate any insight, SOOOO new to all this

 

[CaptainWiese91]

If your PH is 7,5 maybe I would take care of this problem first and see it it’s helped.
because 7,5 is too high and no nutrients or supplements can get absorbed by the roots

 

[MeEasy]

I can tell if it's lighting but they look a light green which is a sign of hunger. Either they need food or you are having a ph problem causing lockout and they're not getting any food

Edit = I missed you saying that the ph could be 7.5 so like I said it could be lockout

 

[Farmbuck]

Bring your PH down to 6.5

 

[grouchyoldman]

Hi there, CyberK and welcome to GWE.

I'm sure you'll get more useful suggestions from the Old Pros here, but in the meantime, I have recently read lots of complaints of slow growth attributed to the cold temps this winter. I noticed a temp reading in the 60's in one of your pics which isn't "Low" in real terms, but may be lower than your Amnesia plant likes. You may want to try and boost both temp and Rh along with it to hit a proper Vapor Pressure Deficit combination in your grow room. I'm shooting for 68 F & 40% Rh lately. Also, get them off the floor if needs be to warm up the soil a bit.

Patience is a virtue...

Best of luck,

-Grouchy

 

[PeterMatanzas]

This is a good point. I have a heating pad under some of my fabric pots.