@johnraymondshaw. I grow A nemerosa it is white which looks lovely in shade .I also have A nemerosa Robinsoniana. I did start with just one pot full of each, which I purchased in flower in the spring. You can also buy them dry and ready to plant in the autumn. They can get into the roots of other plants but I forgive then as they flower for such a short time before they are again dormant.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
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I know what you mean - the thought of it is enough to make you want to lie down in a darkened room ...
I live in west central Scotland - not where that photo is...