It sounds like you have the plant called Veronicastrum (probably Veronicastrum virginicum). It's available from garden nurseries specialising in herbaceos plants - such as Beth Chatto's. I have been growing this plant for many years. It's loved by bees, and in early summer is covered with worker bumble bees. It can be propagated by cuttings in late spring/early summer. Feeding this plant with some fresh soil enriched with mushroom compost works wonders...most flowering plants love the lime compost.
It sounds like you have the plant called Veronicastrum (probably Veronicastrum virginicum). It's available from garden nurseries specialising in herbaceos plants - such as Beth Chatto's. I have been growing this plant for many years. It's loved by bees, and in early summer is covered with worker bumble bees. It can be propagated by cuttings in late spring/early summer. Feeding this plant with some fresh soil enriched with mushroom compost works wonders...most flowering plants love the lime compost.