Hi- I'm wondering if someone could give me some advice about a single plant in my budding grow room. Several of its large fan leaves and a few smaller leaves near the top of the plant have in the past week started turning a little yellow in irregular splotches and the leaf tips have curled upwards. The buds appear totally unaffected. The plants theoretically have about 6 weeks to go before harvest. I read elsewhere on this 420 forum that those symptoms indicate heat stress. I have pulled the plant away from the light to give it a little relief (closest part of the plant is 40" from light) - but leaves remain curled. Not sure yet if more leaves are still getting blotchy.
Grow room specs: 12/12hr light period w/single 1000w hps light about 27" from plant tops, temp range 65-78 degrees normally- max temp has been 85 for short periods; humidity range 45-65, usually in higher part of that range- mid 50's, low 60's, ventilation comes from oscillating fan running 24/7 on medium speed with new air coming into this small (20x30') light-tight barn from open window 10' from grow area. Grow room is in a 8x8" corner of the building open to the rest of the interior.
2 questions: I'm growing one each of several strains and this one - romulan grapefruit - is the only strain whose leaves are turning yellow. Is that unusual? All the other plants look great. Is it possible this particular strain loses its fan leaves during budding earlier than the other strains or is this strain just particularly sensitive to heat?
Any advice would be appreciated! Thanks!!
Grow room specs: 12/12hr light period w/single 1000w hps light about 27" from plant tops, temp range 65-78 degrees normally- max temp has been 85 for short periods; humidity range 45-65, usually in higher part of that range- mid 50's, low 60's, ventilation comes from oscillating fan running 24/7 on medium speed with new air coming into this small (20x30') light-tight barn from open window 10' from grow area. Grow room is in a 8x8" corner of the building open to the rest of the interior.
2 questions: I'm growing one each of several strains and this one - romulan grapefruit - is the only strain whose leaves are turning yellow. Is that unusual? All the other plants look great. Is it possible this particular strain loses its fan leaves during budding earlier than the other strains or is this strain just particularly sensitive to heat?
Any advice would be appreciated! Thanks!!