I immediately went to the source listed but they do not currently have any in stock. If anyone finds a source for this I would love to try some. It's really lovely, however, am unsure how it will take our hot & humid Houston summers. Nevertheless, I would enjoy it for at least one winter/spring. (We start spring gardening here really early.)
Thanks for writing, clland. Melittis is generally available from mail order companies in the spring, as is the case with the two I mentioned in the article. It's rated as hardy through zone 10, so it should be hardy in Texas. If you order some for spring planting, ask the supplier to ship your order as soon as their schedule allows. Depending on the size plant you get, it will bloom shortly after you plant it. Smaller plants may need to make a year's growth before they bloom.
To be on the safe side, choose a spot that is shady all day or perhaps has just a little sun in the morning. The soil should be kept evenly moist, so be sure to water your plant whenever the soil surface becomes dry. Mulching would also help conserve moisture, if dry conditions are a problem.