Why is my gardenia turning yellow?

I've seen answers to other posts on this topic but not sure that any of the answers apply to me. The gardenia in question was moved a couple of years ago -- it had 'layered' new roots from a huge and very healthy gardenia that I have in my back yard, so I moved the new roots and growth to the front to make a new plant. It has been fine for two years, although slow growing and hasn't flowered yet (whereas its parent tree is full of blooms right now). Anyway, now, suddenly, the leaves are turning yellow and nothing has changed in terms of watering, its position, fertilizing, etc. EXCEPT that right before the yellowing happened, I had fertilized the azaleas that are in the same bed as it -- with miracle grow azalea fertilizer. But all the answers I read said that the gardenia needs acid -- and isn't that what's in the azalea fertilizer? So why would the azalea fertilizer hurt the gardenia? The azaleas are fine, so there couldn't have been anything wrong with the fertilizer

Why is my gardenia turning yellow?
It is the acid soil problem,l'm afraid.The fertiliser is very mild and can't fight the lime from the tap water.The miracle gro is an additional help,but not in place of limey soil.


Get some ericacious compost.Lift out the gardenia,and completely wash off all the old soil (all of it)leaving just the root.Plant into the fresh compost,and water well.Cut off all sick bits and pull off yellow leaves.


Acid plants can take such radical root disturbance.


If you do zilch,then the new leaves will be healthy at first but turn yellow as the iron sulphate cannot be released from the soil.Use rain water if poss.They are very cold wind sensitive
Reply:your right gardenias do need acid. maybe the reason why your gardenia isnt doning well it because of a bud. any webbing, or white fluffy things under the leaves may be a bug. also white files can cause problems.





if you can maybe move it to where your other gardenia is doing good.





also it is natural for some leaves to yellow, especially after winter, even in a mild climate. see if it worsens
Reply:could be not enough sunlightor to much water
Reply:Found this. Should answer your question hopefully :)





[GARDENIA PESTS %26amp; PROBLEMS


Yellow leaves


One of the most ask questions about Gardenias is the yellowing of older leaves in late winter and spring. This is usually a sign that the plant is moving its magnesium to the new growth. In the beginning of spring feed with Epsom Salts (Magnesium sulphate) will usually solve this problem.


To avoid getting other nutrients out of balance, only apply Epsom Salts no more than once a year.


Gardenia plants that are healthy will grow vigorously and are less likely to be affected by fungus problems. Planted in an ideal position, kept mulch and well fertilised regularly, will help most gardenias to stay robust. Always keep a close examination of the plants and deal with problems as soon as they materialize]