Ericta，your plant, I think, has got some damage on its root sysytem. This could be resulted by two thing, 1. you put too much water so the soil in pot is too wet that the root system cannot breath well. 2.Osmanthus like acidic soil, and in most cases, after long time of watering, the soil's ph become higher, that also damage root.

That location will provide a great deal of reflected heat and light, something that the osmanthus may find difficult to tolerate in your climate. Osmanthus prefers a fair amount of protection from the full sun, especially during the hottest part of the day...which just happens to be when your plant is getting irradiated and baked! ;-) I agree that you should know, with some accuracy, the pH of your soil. As a matter of fact, a soil test might not be a bad idea. You may find out that fertilization is required for all your plants....or not. Home pH meters can be incredibly bad, as can moisture meters. As can home soil testing kits! I always recommend springing for a soil test. I disagree that you plant looks fine. The leaves should be uniformly dark green, and the shrub should be full. Does your twenty minute watering session do the job? Have you dug around in the soil (not right at the root system, please) about 30 minutes afterwards to see how moist the soil is? In the southeast, where this plant flourishes in some locations, you'll find the healthiest plants under the high shade of tall pines (for example), or in locations that receive full sun in the morning but some shade all afternoon. My Osmanthus, planted in hard, red Alabama clay with no irrigation, is in the sunlight until about 11 ish, when the shadow from the house begins to protect it. NOW! About your use of the imidicloprid. You might not know that this systemic pesticide translocates throughout the vascular system and can be found, subsequently, in the POLLEN and NECTAR of the flowers. Every single insect that visits your osmanthus will be exposed. I even have hummingbirds all over mine! Imidicloprid is banned in some countries because of this. Bees carry the tainted goods back to the hive where it is distributed to all inhabitants. This is not a good thing. There are also some worrisome studies out that appear to point the finger at this chemical for INCREASING thrip populations, rather than decreasing it. It is well documented that spider mite numbers soar with the use of Imidicloprid. Maybe something to think about? Here is a link that might be useful: Soil testing labs

I have a small one that I received as a rooted cutting last year. I have not fertilized it at all. It spent the fall, winter and early spring in front of a sunny south-facing window. The flowers were so tiny they were almost invisible, but the fragrance was incredible. It stopped blooming in mid-spring and I brought it outside. It has shown a little new growth and is starting to bloom again. I just checked your trades list and saw that you hadn't listed anything. I would dearly love to get a bunch of cuttings from you. Since the plants grow so lushly where you are, I was thinking that you could just make a bunch of cuttings from branches that overhang the sidewalk! (Don't get arrested.) Would you like some white tb irises? Pink gladiolas? Styrax japonicus? Loquat? I have lots of things I could trade. I just want to try to get some more plants and no one seems to be trading rooted cuttings or plants at the moment. Ginny

Maybe you could contact the center for advice. INTERNATIONAL CULTIVAR REGISTRATION CENTER FOR OSMANTHUS http://www.ishs.org/sci/icralist/81.htm The EU have a list of plants which pass the VCU test. https://ec.europa.eu/food/plant/plant_propagation_material/plant_variety_catalogues_databases_en And there is also trials for Osmanthus fragrans in China. Though there are several Osmanthus fragrans passed the official variety trial of certain province, but all are in the subtropical provinces which latitude are familiar. (Zhejiang, Jiangxi, Hunan, Hubei, Sichuan. It is an independent test in each province. And there are smaller trial regions under province. ) http://www.lmzm.org/lzcx.html (Chinese) Osmanthus fragrans cv.『Jin Qiu gui' Osmanthus fragrans 『Caihongliujin' Osmanthus fragrans『Chuandan-12』 Osmanthus fragrans cv.『Zhuang Yuan hong' Osmanthus fragrans『Yulian Yinsi' Osmanthus fragrans『Yuling Long' Osmanthus fragrans 『Jinyu Taige' 0smanthus fragrans 『Jinman yuan' Osmanthus fragrans var. thunbergii Makino Osmanthus fragrans『Xiaoye Sugui' Osmanthus fragrans 』xideguizi' Osmanthus fragrans『Hangzhou Huang' (All official variety trial of the plants which governed by the Bureau of Forestry ) By the way, Here is the page of plants which passed the official variety trial of the plant which governed by the Department of Agriculture. http://www.seed.gov.cn:4000/CountrySeed/SpeciesDemand/Default.aspx?type=1 P.S. There are no Osmanthus fragrans in the AGM list but other Osmanthus species. https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals Osmanthus delavayi 1993 H5 Osmanthus heterophyllus 'Goshiki' (v) 2012 H5 Osmanthus heterophyllus 'Purple Shaft' 2012 H5 Osmanthus heterophyllus 'Variegatus' (v) 1993 H5 Osmanthus yunnanensis 2012 H5 Osmunda cinnamomea 1997 H7