I have some mullein planted in my yard also ! It used to grow wild all over the place when i lived in Idaho; but if it does here in Alabama, I have not seen any of it.
I got some seeds and planted it last year. Mullein is a two-year plant, and the first year, it just had the rosette of leaves, and this year, it is making the stalks.
I harvested some earlier this summer, dried the leaves and chopped them up, and we use them for mullein tea. My husband has bad lungs, and he enjoys the mullein tea.
I am going to harvest some seeds just in case these plants are not self-seeding enough for them to come up again next year.
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