Confused...can anyone help?

When our lights go off for the day three to five plants are drooping badly. They seem to be fine when the lights come back on, although it takes about an hour to fully recover. The plants are about 5 weeks old and are grown from seed. We use a 3 part chemical feeding system and started on the "RECIPE" feeding about two weeks ago. Other than that the plants look healthy. Room Temp: 72 at night, 83 at the warmest using a 1000 watt MH lamp. Soil: Sunshine #4, any ideas? I attached a pic right when the lights come on, so you can see the drooping plant compared to the others.

How heavy is that plant's pot that its in? Possible over watering? Does that plant move much and have enough height to get worked over by that fan?

they look really healthy to me man. i use sunshine too. you should add some worm casting to it. maybe some coco too. i've seen better results with the worm castings and the coco adds more water retention to offset a little too much perlite in the mix. watering info? are you watering daily? that might be the problem. if not then i would say it's the regular plant cycle.

Nothing unusual about this. In the lights on the plant is burning through its water faster so the leaves are a bit lighter but obviously not dehydrated. At night it cools and in the dark photosynthesis slows so the plants droop from bit of extra weight as the leaves fill but dont use or transpire it off as fast so the weight causes a bit of droop or hang. Some grow areas will even condensate at lights off time if no dehumidifier is in the area.

the plants are sleeping, really! they understand there is no usable light for growth around so no need to have their leaves up, when the sun comes and light becomes available they will move to the light. in outside cases its everywhere so they just look normal but for inside grow your light all comes from above so they look like they perk up to get as much sun from your light as they can.

this is speculation i have not read any official reports on this so, might not want to go to the bank with my info

nuglets said:

they look really healthy to me man. i use sunshine too. you should add some worm casting to it. maybe some coco too. i've seen better results with the worm castings and the coco adds more water retention to offset a little too much perlite in the mix. watering info? are you watering daily? that might be the problem. if not then i would say it's the regular plant cycle.

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Cool, sounds right. I water every four to five days, I use 3 part General Hydro feed when I water each time. I only use straight water to flush at the end of flowering is what I have heard...any thoughts.

It is normal for the plants to droop when the lights go out. Just as long as they chase the light when they are on !!

Celena said:

Cool, sounds right. I water every four to five days, I use 3 part General Hydro feed when I water each time. I only use straight water to flush at the end of flowering is what I have heard...any thoughts.

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i'd think about doing a feed, feed, water or feed, water, feed, water, schedule. pumping chelated nutes into soil can cause buildups. GH is pretty solid but they do have their issues when it comes to salt buildup. try out the f,f,w shedule. i think you'll see better results at the end of your grow. will definitely give you a cleaner smoke. not saying to flush them. just give them pH adjuste water. if you use r/o or distilled water then maybe some cal/mag. 150ppm. that's it.