small periwinkle blue flowers outdoors swaying in the wind. vinca herbacea. concept nature. shallow depth of field.

grass outdoors love blooming pressure beauty petal macro background nature pharmacology vinca alkaloid vinpocetine natural leaf garden blossom spring botany flora meadow drug foliage minor plant season poisonous nectar bloom floral symbol periwinkle decorative closeup herbal flower undergrowth green purple botanic summer blue hypertension beautiful