Cannabis Seedling Weird issue. 2 week old plant.

PlantLover300

PlantLover300

Member
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This is a 2 week old Jack Herrer plant that I have grown from seed.

It has been growing very well and looked amazingly healthy until this morning. I check on my plants and the biggest ones have this weird leaf issue I have researched and have no idea what it could be. And want to correct the problem as soon as possible.

The plants are growing in a grow tent under a 600watt HPS bulb that is about a foot and a half away. There is plenty of air circulation. And the temps in the tent do not exceed 80 degrees during light operation or less than 68 without.
 
xmatox

xmatox

Well-Known Member
PlantLover300 said:
View attachment 3780507 View attachment 3780508

This is a 2 week old Jack Herrer plant that I have grown from seed.

It has been growing very well and looked amazingly healthy until this morning. I check on my plants and the biggest ones have this weird leaf issue I have researched and have no idea what it could be. And want to correct the problem as soon as possible.

The plants are growing in a grow tent under a 600watt HPS bulb that is about a foot and a half away. There is plenty of air circulation. And the temps in the tent do not exceed 80 degrees during light operation or less than 68 without.
Click to expand...
How is your canopy temps? Your light could be to close.
 
PlantLover300

PlantLover300

Member
xmatox said:
How is your canopy temps? Your light could be to close.
Click to expand...
Placed thermometer at level with top of pots and it read 90 degrees. I am surprised to see that. What are acceptable canopy temps?

Do I measure my light distance from the glass? It is air cooled. Or the actual bulb/reflector behind the glass?
 
xmatox

xmatox

Well-Known Member
PlantLover300 said:
Placed thermometer at level with top of pots and it read 90 degrees. I am surprised to see that. What are acceptable canopy temps?
Click to expand...
You would measure from the glass to the top of the plant. Air cooled hoods are good for controlling heat to an extent, but not always the case. 90º is pretty hot, especially if you are not supplementing co2 and water. Personally, if I wasn't running co2 I would want to be right around the 78º- 82º range during day temps and possibly dropping down to 70º for night temps.
 
PlantLover300

PlantLover300

Member
xmatox said:
You would measure from the glass to the top of the plant. Air cooled hoods are good for controlling heat to an extent, but not always the case. 90º is pretty hot, especially if you are not supplementing co2 and water. Personally, if I wasn't running co2 I would want to be right around the 78º- 82º range during day temps and possibly dropping down to 70º for night temps.
Click to expand...
Then by your method of measuring my light is only 14" above the tops of my plants. I am assuming that is too close. Didnt realize a couple inches had so much impact. I will raise the light to 18" and take my canopy temps again.

Information on my setup. Its a 8" xtrasun 84 hood with an open intake and 8" inline fan attached to exhaust being routed outside of the grow tent. The fan produces arounf 700CFM but I turned it down to 70% speed for noise.
 
xmatox

xmatox

Well-Known Member
PlantLover300 said:
Then by your method of measuring my light is only 14" above the tops of my plants. I am assuming that is too close. Didnt realize a couple inches had so much impact. I will raise the light to 18" and take my canopy temps again.

Information on my setup. Its a 8" xtrasun 84 hood with an open intake and 8" inline fan attached to exhaust being routed outside of the grow tent. The fan produces arounf 700CFM but I turned it down to 70% speed for noise.
Click to expand...
You setup sounds fine. I would raise to 18'' and check temps again and continue to raise and lower the light accordingly throughout the grow.
 
PlantLover300

PlantLover300

Member
xmatox said:
You setup sounds fine. I would raise to 18'' and check temps again and continue to raise and lower the light accordingly throughout the grow.
Click to expand...
The grow tent temperature range stats basically a constant 78-80 degrees and at night going down to maybe 70. But I don't really understand the canopy temperature and how to control that other than adjusting the distance of the light. I set it at 18". I am running the lights on a 18/6 cycle.
 
xmatox

xmatox

Well-Known Member
An oscillating fan will definitely help your situation if you don't have one already. This is different from an inline fan (in case you didn't know). I would aim the fan to push air out between your light and the top of the canopy. I don't like to blast my girls with direct air a throw them around. I will use the fans to have moving air in my room, indirectly hitting the plants. The plants will still get a breeze, just not as hard.​
 
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