I was inspired to write about this subject after seeing almond trees in bloom earlier this month.
I learned that 25% of deciduous trees, including most Prunus species are hysteranthous. While both leaf and flower buds of deciduous trees require a certain number of hours of winter chilling to open, once this number has been reached, flower buds on certain tree species are more responsive to warming temperatures and thus open prior to leaf buds.
In the absence of leaves, flowers will also be more abundant which means more insects will visit them and more pollination and seed formation will occur. Wind also affects pollination and will be more of a factor in blowing pollen from one flower to another without interfering leaves.
Their growth habit is described as semi-evergreen since they are briefly deciduous before they bloom. In the tropics, this bloom period depends on the weather since a wet winter will delay flowering and a spell of dryness encourages it, as a trumpet tree may persist in forming leaves as long as soil moisture is high. Pink trumpet tree is the national tree of El Salvador, where tourism spikes during its bloom period.
The coral trees that we grow here originate for the most part in South Africa, whose Mediterranean climate is similar to our own. These hysteranthous trees, in the manner of trumpet trees, also bloom at the onset of dry weather. In the case of coral trees, however, there is another advantage when leaves are absent at flowering time. Passerine birds, those that perch and make up 60 percent of all avian creatures, play a significant role in coral tree pollination.
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