My first coco grow, thoughts?

C

ChemPro

Well-Known Member
Today is the start of week 8 of flower. I attached some pictures. I am not sure if I have a problem or not. Some yellowing of leaves, brown spots on certain areas. The yellowing seems to be dominant in the center.

Thoughts?

Info
  • 20 plants, clones from Original white widow from Paradise seeds
  • 1000W HPS
  • 590 cfm exhaust fan
  • all plants are grown in 2 gallon smart pots
  • Using cocotek nutrients A+B
  • Used tap water originally, adjusted it to 5.8, past week i've been using RO water
  • watered once a day by hand
  • my coco is calcium enriched and did not require hydrating
 

Attachments

Septumm

Septumm

Active Member
To me it looks like a calmag deficiency. I think at this late in flowering it is nothing to worry about and I also believe a lot of people stop adding extra calmag when they start flowering. Had this happen on my last (first) grow.

Also what size tent, and is it a pain to manage 20 plants? How do you go about watering that many (especially ones in the back)
 
C

ChemPro

Well-Known Member
Its a 5x5 tent. It opens on the left, the right, and in the front. I have to water from all openings. I water 6 from the left opening, 4 from the right opening and 10 from the front opening. It takes about 5 minutes to water the whole tent. Its not too bad. I also have a long stemmed funnel that helps but isn't necessary.

upload_2016-9-3_20-17-4.png
 
FullyRootedFarms

FullyRootedFarms

Member
Pretty sure that is a cal mag deficiency.... I use calmag until week three but honestly each strain is unique in the amount of calmag they need. For example, OG is a heavy feeder when it comes to calmag. Since you are close to harvest, I wouldn't add any calmag just keep it in mind for your next grow
 
FullyRootedFarms

FullyRootedFarms

Member
Just saw that you are using Reverse Osmosis water which tends to strip the majority of calcium out of the water. More evidence of calmag def
 
Septumm

Septumm

Active Member
Nice! How long do you let them veg for/how tall do you let them get before switching to flower? Do you start from seed or clones? Seems like an awesome way to fill a tent quickly :P
 
C

ChemPro

Well-Known Member
Septumm said:
Nice! How long do you let them veg for/how tall do you let them get before switching to flower? Do you start from seed or clones? Seems like an awesome way to fill a tent quickly :P
Click to expand...
I started from clones. I vegged for almost 2 weeks then flipped. Just transfered 49 to a 3x3 flood table and flipped as soon as they rooted.
 
Septumm

Septumm

Active Member
ChemPro said:
I started from clones. I vegged for almost 2 weeks then flipped. Just transfered 49 to a 3x3 flood table and flipped as soon as they rooted.
Click to expand...
Wow that's quick! Keep up the great work :D thanks for answering my questions
 
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