Question
Hello:
i have an 3 yr old orange tree (i think it's blood orange),little white flowers and new leaves start forming in spring. but suddenly i start noticing the leaves (both new and old) are turning yellow and falling off, what is the wrong with my tree? please help. thank you
min

Answer
Min:
The symptoms that you describe are often times related to a unfavorable root environment.  This may be due to numerous issues, however soil drainage and/or soil moisture is usually out of balance (too much or not enough).  The soil needs to drain easily, whether it is in a pot or the ground.  Soils that have a high content of peat/peat moss can hold water and create a root stress.  If your plant is in a pot, you may consider carefully removing it and looking at the roots. They should be light colored.  If they are dark brown to black, this may indicate a root rot.  These rots are often initiated by wet conditions.

Sometimes a sudden change in the environment can cause leaf drop.  Things like a drop in temperature or a change in light levels can cause this as well.  This condition is often a temporary situation and the plant will re-leaf out when the condition(s) stabilize.

Lastly, If your plant is in a container, be sure that the roots have not become crowded.  This can lead to leaf drop also.

Regards

Steve