This plant is very old. Just last year, I put 3 different smaller pots

together into this longer planter. They've lived outside all spring thru fall on my shady deck for years and have always done well. But look what happened this year. The now brownish and not-so-pretty areas were new growth, I believe. What do you suppose made this happen? Nothing bad is happening to them right now but I want to make sure it doesn't.
this plant is very old just last year i put 3 different smaller pots, gardening
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