The flowers produce much pollen and sometimes much nectar. They are particularly visited by long-tongued bumble bees. They are also visited by short-tongued bumble bees, honey bees and solitary bees. The extra-floral nectaries are mainly visited by honey bees. Honey: light to dark amber, with a mild flavour, granulates fairly quickly with a coarse grain. If honeydew is also collected from aphids on the plant, the honey is darker. On the right soil type and in the right weather conditions, honey yields can be high, but at other times there can be little or no honey.