I keep my greenhouse heated at night by paraffin unfortunately, last night I managed to spill some in the greenhouse which was quite Strong. This morning the seedlings were all doing fine at that poing. As it was such a sunny day I left the door open however when I returned to the greenhouse this evening all the seedling have turned white and drooped over. It almost looks like frost but the door is always closed at night and heated.. Please could somebody help explain this disaster..
