periwinkle flowers blossom in the spring garden. common periwinkle. green background. 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