Raspberries and cream

This is the hemp agrimony (Eupatorium cannabinum) that I planted in the boggy area round our new pond. The flowers are lovely - love the common name raspberries and cream. The plant is supposed to attract butterflies, bees and hoverflies - seem to have only found hoverflies on it so far. Apparently the seedheads provide food for the caterpillars of Wormwood Pug, V-Pug, Lime Speck, Marsh Pug, Gem and Scarce Burnished moths, so perhaps I should just leave the plant as it is once it has flowered.