Hobblebush
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I've seen this happen a few times and like Jimster said it's not a problem if it's on one or two leaves. Anecdotally, I've seen it happen to plants when they change growers. As in, when someone gives someone else a mature plant, they take it home and put it in their environment and give it their feed and the tips do a nosedive. So I suspect it's likely related to a change in nutrients or ph. Did you change anything recently? Did anything otherwise change? Add anything? Runoff numbers are the same as usual?
Its probably from the change in ph. Funny though that it fits my observation that this happens sometimes when a mature plant changes hands from one grower to another.
some other leaves that are turned down
I have a handful of leaves that are asymmetrical and also have lighter edges. Is this nitrogen toxicity and if so is there any timely way to treat it?