Commonly called false sunflowers, all heliopsis plants are North American wildflowers, and they make excellent cut flowers.
The stems, flowers, and leaves of all species of monkshood are poisonous.
I have recently become besotted with chartreuse foliage, even though, or perhaps because, it is a color that I have never been able to wear.
Wordsworth obviously was as impressed with this versatile plant as we still are today.
Some shrubs have only one season of interest and forsythia is one of them.
Yellow is definitely the color of the month in my garden, and I suspect in yours.
When we consistently plant the colors we like, it usually happens that the color scheme pleases us overall.
If you need color in your shady woodland garden consider planting Japanese kerria, either as an accent or as a massed shrub border.
Mahonias are robust, small shrubs that combine well with other evergreens such as conifers and hollies.