Hi there. I have 2 birds nest spruce planted in the same bed and have been there 4 years now. One is thriving (pic 2) while the other started struggles last year with discolouration and dead spots this year (pic 2). questions: 1. does this seem like an oversaturation issue? Maybe a low spot not affecting other? 2. will the pruned spot recover and fill back in or time to start again? thanks!