author
An early 20th-century British gardening writer, he produced practical books on roses, garden construction, maintenance, and sundials, blending hands-on advice with a clear love of traditional garden craft.

by T. Geoffrey W. (Thomas Geoffrey Wall) Henslow
Published as T. Geoffrey W. Henslow, Thomas Geoffrey Wall Henslow is credited in library and public-domain records as the author of works including Ye Sundial Booke, The Rose Encyclopedia, Garden Construction, and Garden Maintenance.
The surviving records available here point to him as a gardening and horticultural writer active in the early 1900s. His books suggest a practical, instructional style aimed at readers who wanted both guidance and inspiration for building and caring for traditional gardens.
Reliable biographical detail about his personal life appears limited in the sources I could confirm during this search, so this overview stays close to the published record of his work.