Answer: What you are seeing might be winter damage (wind burn, frost, etc.), especially if the browning is only on the tips of the foliage or only on one side of the plant. If the browning is all over, it might indicate root stress from too much water or poorly draining soils. Spring is the time the plants wake up and begin their growth cycle so they may have been suffering from damage over the winter months and it is just now becoming apparent. Wait to see if they put out new growth. If so, the plants themselves are alright and you can eventually prune off any dead foliage. If they do not put out new growth, the roots are suffering from some malady and you may have to dig them up to discover what it might be. Wish I had something more positive to offer!
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