Are you ready? It's time for our 14th annual photo contest! Enter your best pictures of the year, for a chance to win a calendar and annual subscription here. Hurry! Deadline for entries is October 21.
Have the leaves suddenly turned yellow, or are they slowly yellowing off? Are the younger/newer leaves still green? And is the yellow an even colour across leaves or blotchy, or between the veins, etc? It could be a mineral deficiency, or even too much water. But the answers to the above questions could narrow it down.