About half a year ago I've bought common sage (salvia officinalis), which died (apparently, because of over-watering), but I have succeeded to make a new plant from its cutting. However, the plant that I currently have, was growing nicely and had about 7 leaves, but one day the problems started again... It didn't seem to be overwatered, but when I was checking if there is maybe too much water under the container, I saw that there was one pair of pretty long roots coming from the container and soaking in some water that was in clay pot beneath. So, that was causing the problems... Immediately I removed the old soil and replanted my sage, to make sure that there was no roots sticking out at the bottom. It was all fine (the plant came back to life), I just needed to remove a few leaves that were already brown for some reason. Now, maybe a week or two after that, I'm having some problems again with that sage... This plant currently only has four leaves. They are all curled and hard (like if they were dry), but they still have green colour, although it's somehow pale. I thought it didn't have enough water since the soil was only a bit moist (even about two inches deep) and I watered it, but after two days it's still looking the same

The weather became a bit more warm here, but I'm not sure if that's the cause of the problems. It's gets to about 28°C, maybe 30°C max. (82°F - 86°F)
I'll add a photo of it. If you have any ideas they'd be much appreciated
