As you may know, although it may have had its origins in gardening, by the time of your ancestor’s involvement, the Free Gardenry was simply another Friendly Society; the naming of lodges after flowers, merely a tradition. A perusal of the Hexham Courant for the relevant years might shed some light on its activities but, sadly, these have not been digitised and so would require a visit to Hexham Library! Further information about Free Gardenry can be found on the Internet at https://jvc.oup.com/2021/02/11/the-brotherhood-of-free-gardeners/