What do you need to pay attention to when shooting flowers on cloudy days in SLR photography? Do you need a tripod?

Shooting plants in rainy days has advantages and disadvantages. The advantage is that the humidity is high in rainy days, which makes plants particularly watery. The disadvantage is that the light is poor and the light ratio is weak, which may lead to low picture definition. If you shoot at a macro, you'd better use a tripod, even if it's sunny, because a little movement will paste.

Please refer to the following two thistles, which were taken on a sunny day and a cloudy day.