Jump to content
Strain Hunters Forum
Guest Guest guest user
Existing user? Sign In  

Sign In

Or sign in with one of these services

Sign Up
Search In
  • More options...
Find results that contain...
Find results in...

unknown black spots

Recommended Posts

hi growers.

this is the Big Bang after 4 week of reveg.grow.Now after first week of flo.since 2 days i have  this problem with leaf s.


grow in 7 l pot. soil,perlite and coco.

under 120w led and 2 cfl bulbs 23 w each.

i dont know the ph in soil .

temp.25c day night 18-20

50 % humidity 

i have give for this plant twice some fertilizer ( Miracle grow single pack) NPK -  24- 08-16    half pack for 7 l water

now since this plant is in 12/12 i didn t give any fertilizer

the black spots where they came from? somebody knows? 



  • Like 1
Link to comment
Share on other sites

yes could be from PH i see you say you don't know the PH of the soil but do you know the PH of the water you give?

Link to comment
Share on other sites

Hi friend, 


These leaves show a lack, either for lack of food, either as a result of some other nutrient that blocks root.

Check the pH of the irrigation water is vital. At flowering, you should water, if using land as a substrate, with 6.2-6.5 ph 
If you use coconut as substrate, should be watered with ph 6 in flowering 
Adjust the pH helps the plant to get well, all the nutrients you need. 
  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.