Murderous proclivities run in the buttercup family (Ranunculaceae) as its trade mark. It might be an explanation why a lot of buttercups and other species are so overtly alluring and display a range of wonderful colours, shades, shapes and sizes, and they all go "unpunished", as the plants feel totally safe. Animals - including people- avoid eating them. Only aphids find the poisonous sap delicious and absolutely harmless. What a pity!
There are several species (Trollius europaeus, T. asiaticus, T. yunnanensis, and their hybrids known as T. x cultorum) as well as a few cultivars available on the market. They differ in the time of flowering but all are spring and late spring flowering plants. The colour range of the globular flowers encompasses alabaster white, light and deep yellows as well as deep orange tones. The early globeflowers make perfect cut flowers, the late flowering ones too, but their principal place is a perennial border as they are quite tall (90 cm, 2ft.) along with deep blue salvias and velvety blue siberian irises, purple and azure larkspurs, white chrysanthemums, and red and pink roses, to name a few. After the first flush of flowers you may consider cutting the stems back heavily to encourage a second one. Unfortunately, it cannot be guaranteed.
When the plant clumps are big enough you can divide them in early autumn or spring. 'Golden Queen' produces abundant seeds which germinate freely. Let them do so. After several years you can count on a mind-blowing spring display of mango-coloured flowers.