Osmanthus Fragrans leaf tip turned brown
We purchased a 2-feet-tall Osmanthus Fragrans 'Fudingzhu' today. Although young, it is already flowering. Our only problem is that the tips of the leaves were turning brown in the nursery. All of the nine Osmanthus they have showed the same brown tips. (We took it home anyway because it was the only one flowering.) Pictures below:
The nursery staff said it is probably caused by over-watering (the white residuals on the leaves come from their hard tap water). We did some research online, and suspect over-fertilizing.
Any diagnosis? Thanks.