Flowering in Blueberries

Flowering in the blueberry crop is relatively long, lasting between 7 and 14 days and generally taking place from April to the end of June.

Figure: Biological cycle of the blueberry

Blueberry flowers are grouped into inflorescences made up of 6 to 14 perfect, complete flowers.

They are shaped like an inverted bell, formed by a white to pinkish corolla with 4 to 5 fused petals and a small opening.

The length of the flowering period can be influenced by temperature. Early cultivars tend to have longer flowering periods than late ones, since they start flowering while temperatures are still relatively low.

The position of the bud also influences the flowering date, because flowering occurs basipetally, that is, from the tip towards the base.

The same happens within the inflorescences: the flower bud at the tip opens first, followed by the remaining buds, until the whole cluster is in flower.

This flower has characteristics that discourage self-pollination and promote cross-pollination. The shape of the corolla protects the stamens from the wind, preventing the pollen from falling onto the flower's own stigma. It is also affected by the position of the stigma in relation to the anthers.

Pollination is therefore entomophilous, in other words, carried out by insects.

The insect most used in blueberries is the bumblebee Bombus Terrestris, since it releases the pollen from the anthers by vibration, which makes it more efficient than other species.

Did you know about the particularities of blueberry flowering?

Tell us in the comments!