Hi, I'm hoping someone can help me narrow my latest greenhouse problem down. I have been attempting to grow herbs and lettuce since the beginning of march. After 3 months I found the sun was not enough to allow growth so I added T5 bulbs and fans inside (I prefer to keep the greenhouse closed...bugs).
Over the past 3 weeks or so growth has been tremendous! I was finally on a roll. Temps have occasionally gone over 100f but typically remained between 62 and 95 ish. Because I know that it will get a lot hotter (lettuce heat intolerant) I needed to defend against the heat, I installed an exhaust fan yesterday. It is set to come on when the greenhouse reaches 85f.
Today when I got home, lots of my lettuce had wilted as well as all of my immature cilantro. I left the inside fans on overnight last night for the first time (because I had installed the exhaust, I thought it would be ok to do this). So when I saw all of the cilantro wilted and a few of the older leaves of the lettuce but none of the immature lettuce had wilted, I assumed it may have gotten too cold overnight with the fans on. So I reverted to previous set up of turning inside fans off when the lights go off. I checked on it a few hours later tonight and my immature lettuce had begun to wilt. I turned the exhaust fan off all together until I can figure out the problem.
I have not yet created an intake vent, but the garden does not close very well so I thought that could wait a day or two.
The soil is moist, I have a moister reader and I use rice hulls as mulch which helps retain moister.
I have a light fertilizer on top of the rice hulls so it will slow release when watered.
Exhaust fan Airflow: 110 CFM
Fertilizer: Espoma Tomato-tone Granules Organic Plant Food
I don't want to loose all of my progress. I've already sowed more seeds but can anyone assist on what my issue may be, seeing as all this happened overnight. I cut most of the wilted leaves earlier before I decided to reach out of help so you won't see many wilted leaves, just less leaves on the larger lettuce. There was not enough cilantro yet to trim back the wilted portions so that was left as it was.
Thank you for your help in advance.
