1. looks like the grower forgot about how important ph was when it comes to soil? if it is in soil??
2. Over feeding will make your plants look like this.
3. over watering will cause wilt.
4. cold temps, but doesnt look like the prob here.
u will actually have to over correct per say to get the right balance. If my ph is 8, I will flush with 5.0-5.5 water... this will balance out the ph to around 6.8 range.