When rain is forecast, I usually move my small potted plants underneath the eaves of the house or garage, where the large overhang acts like an umbrella and creates a kind of rain shadow. But the pot of my Negronne tree is too big to be completely underneath the eaves, so this year I've been using a "rain cape" on it. Whenever it's supposed to rain, I go tie a garbage bag around the trunk, making sure the top of the soil is covered over and that the bag wraps down the sides of the pot. That way the rain doesn't get into the pot. Granted, it may not look all that pretty, but it's worked in keeping the pot from being soaked during our downpours. I admit that it would have looked better to use one of those clear bags. But I accidentally bought a box of orange bags that the garbage pickup won't accept, so now I have to find creative uses for them ... such as rain capes for figs.