In May I saw a hesperis matronalis in a beautiful burgundy colour in NT Sissinghurst Castle gardens. I have only seen hesperis matronalis in purple or white and wonder if you can guide me to where I can find seeds or plants in this beautiful burgundy colour?
We don't make vendor or product recommendations but you could contact the Sissinghurst gardens and ask them about it. I don't see any burgundy varieties when I do an online search. It is considered invasive in several midwestern states.
Here are their website and email addresses:
https://www.nationaltrust.org.uk/sissinghurst-castle-garden
sissinghurst@nationaltrust.org.uk
More information:
https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=278038
https://www.gardeningknowhow.com/plant-problems/weeds/dames-rocket-wildflower.htm