Hello, I live in Toronto and my lettuce has started to turn an unhealthy color. Is this tip burn or something worse?
It does look like more than just tip burn which is caused by inconsistent watering. It could be a fungal disease but it could also be that the weather has been particularly wet lately and the lettuce has been subjected to drowning conditions. Good drainage is critical to vegetable gardens and even more so with the amount of rainfall we have been experiencing. I’m attaching two links to websites that discuss growing lettuce: