Hi there! When my hibiscus does the yellowing of the leaves it either means its not getting enough water or it wants some food. Once I add some slow release fertilizer and make sure it gets lots of water it stops yellowing. Those leaves are goners however so if you don't like the way they look you can pick them off really easily. I had a problem last year with white flies liking them (you can usually see them on the closed flowers) but after a spray of neem oil we've been fly free!

Welcome to the forum by the way. Where in So Cal are you? We have lots of gardeners in Ca. from San Diego up to San Francisco. I'm in Ontario, lovely cow country.

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Women and cats will do as they please. Men and dogs should relax and get used to the idea.