Gardenia's yellow leaves and completely ruined roots: skillfully revived, it soon bloomed all over

Hello everyone, today I'm posting about the gardenia I bought last time. It's looking a bit wilted. Looking closely at the roots, many of them are broken, and the soil is completely full of roots, which has already affected its blooming. So now we need to repot the gardenia
When we repot, we should damage its roots as little as possible. You can see that the soil of the bought gardenia is all very hard yellow clay soil. We can soak it loose in water or wash the soil off with tap water to reduce damage to the roots
For gardenias, it's best to use loose, breathable soil. I used peat soil, perlite and vermiculite in a 4:1:1 ratio. Because I'm lazy about watering, I added one part garden soil, so its water retention is very good
When potting, be sure to put a tile piece at the bottom, then first put one fifth of the soil at the bottom, then put in a few granules of compound fertilizer
Then cover with a layer of soil to bury the fertilizer. Then, holding the gardenia with your hand, pot it while filling soil and shaking the roots, so the roots don't all clump together
After filling with soil, shake the pot a little and press the potting soil firm with your hands. The soil level should cover the roots by about one cm or so
Then water the gardenia thoroughly, then place it in a spot with diffused light or in a shaded, ventilated place. You can put a bag over it to keep in moisture, poke a few holes in the bag, and care for it for about a week
When you see new leaves clearly growing out, it means the transplanting has succeeded and it's alive. During this period, yellowing of old leaves is normal; just pick them off directly
After a week, you can care for it normally, and gradually let it receive light