I have read many articles that night-time watering is not good for plants. Could you please explain why?
There are a couple of reasons, both explained in this Extension article (and based on science): When is the best time to water the garden?
Although this is out of Iowa, the disease issues are even greater in the Pacific Northwest, where we have thousands of diseases--in the soil and the air--that take advantage of cool, moist environments to invade and harm plants. I hope this is helpful.