I love warm, still spring days when the air is heavy with the sweet fragrance of citrus and Jasmine flowers, and the lethargic buzzing of bees that seem intoxicated by the perfume.
Citrus trees produce many more flowers than the tree could support if they developed to full maturity as fruit, and a reader has asked if she should remove some of the flowers.
This is not necessary, as most species of citrus will shed the excess flowers at the end of the flowering period when the developing fruit is no larger than a pea. A further shedding of tiny fruit often occurs when they are about 2 cm across. However, there are other causes of fruit drop beyond what the tree intends. Water stress and sap sucking by Bronze-orange or Spined-citrus bugs are common causes. A deficiency of copper (which is only needed in tiny amounts) will cause citrus trees to drop small fruit, and flowering stage is a good time to give your trees a drink of seaweed extract tea, especially if your soil is low in organic matter.
Make a note of when your citrus trees flower because 3 months after flowering the final amount of fruit the tree will produce that season is established. At this time you can remove excess fruit, particularly on young trees.
On some species of citrus, flowers are well spaced as in the photo above. On other varieties flowers form in clusters and, even if only a third of the flowers in this photo developed into fruit, the weight of the fruit will cause new wood to bend downwards, resulting in a poorly shaped tree in years to come. The weight of excess fruit can also split young trees. It is worthwhile being patient with young citrus trees, and foregoing fruit until they have established a sturdy framework.
On older trees, simply pinch out any young fruit that will form a compacted cluster when mature to avoid putting too much weight on new wood at the end of branches.