Question: hibiscus

Hi, a few days ago I bought a beautiful orange and red hibiscus. on the same day, when I returned home, I poured it into a larger pot, with a common garden soil mixing a long-release fertilizer (of a light blue color), I watered it and then put it in shadow.
the day after I noticed immediately that the leaves were a leash! reading on your site I realized that he loves the sun and therefore thinking that the problem had been the shadow I moved it to a sunny place.
The day after is even worse. the leaves are flies and dull green.
I wouldn't want to lose this plant, also because a long time ago they gave me a yellow one and did the same end, flies, yellow leaves, then they recovered a little bit but didn't make it ...
I also read that the earth should be mixed with expanded clay and bark to make the roots look good. at this point, should I re-pot it again mixing this time with a bit of expanded clay with the ground? or would it be just another stres given to the plant?
I also took pictures to show them, but they can't be uploaded. I also asked the nursery where I bought the plant, showing him some photos, but he couldn't give me a concrete answer.
I hope you can help me, thanks in advance

Answer: hibiscus

Dear Nadia,
all plants when repotted undergo a certain stress, even if passing from a small pot to a larger pot, stress is minimal, compensated by the fact that the new "house" is wider and more spacious. Surely placing a hibiscus in the shade is not a happy choice: it is plants that love a Mediterranean climate, even if its origins are far away, as the botanical name says, hibiscus rosa-sinensis. These evergreen shrubs in nature can become small trees, with large, shiny, dark leaves that form a broad and dense crown. They love very sunny positions and good environmental humidity, so in the height of summer they need to be sprayed on the leaves too. While many plants grown on our terraces and in the gardens can endure even long periods of drought, the evergreen hibiscus prefers to be watered regularly, and perhaps the quantities of water may have been the problem of your shrub: watering regularly does not always mean keeping the plant soaked in water; It is enough to water every 3-4 days, intensifying the watering more the climate becomes warm and dry. But in any case, we always wait for the soil to dry perfectly between two waterings, just dip your fingers a few inches into the pot, if the feeling is fresh and moist, we postpone watering. Another problem that may have caused your hibiscus to suffer is manure; when using any fertilizer it is necessary to carefully follow the instructions on the label. Using a liquid fertilizer, the amounts of mineral salts supplied to each individual vessel are self-leveling, ie: we read on the label to dissolve (for example) a fertilizer cap every 3 liters of water; we use the solution obtained for watering our pots; without us having to pay attention to how much water we supply to each pot, simply by watering, obviously the larger pots will receive more fertilizer, the smaller ones will receive much less, it goes without saying. With granular fertilizers it is necessary to pay much more attention, because for each volume of soil we will have to add a given quantity of fertilizer, if we exaggerate the excess fertilizer will remain in the pot, and every time we water it we will dissolve more: if it is too much at the time of insertion into the ground, it will be too long for months, with obvious suffering from the plants. Because excessive amounts of fertilizer "burn" the roots. Usually in a vase of about 30 cm in diameter we will add about a tablespoon of granular fertilizer, but it is always good to carefully read the indications on the label, and in indecision it is better to put less than too much. Fertilizer for plants works more or less like vitamins and mineral salts in tablets for us humans: when you take a vitamin complex, you take one tiny tablet, and it is enough; if you read the nutritional tables that indicate how much magnesium we have to take (for example) they indicate you some milligrams, and this is also true for an adult man, say of 80kg in weight. In the same way, plant fertilizers should be used sparingly, and with care, because in excessive quantities they can be very harmful.