We used to watch this series on Mysteries Channel, then it ended:>(
AND we found that the library had the whole series on DVD...
We watch one or two episodes each night.
Searching now on google, found these links:

Meet Rosemary Boxer and Laura Thyme, two women who battled back from personal setbacks to make a fresh start in life by starting their own gardening business. However, mystery is never far away and Rosemary & Laura’s inquisitive nature never let them rest until they have found the solution. Welcome to the world of Rosemary & Thyme
https://www.locatetv.com/tv/rosemary-and-thyme
Rosemary and Thyme at TV.com
Rosemary & Thyme was a British television series that starred Felicity Kendal and Pam Ferris as gardening detectives Rosemary Boxer and Laura Thyme. hide ...
www.tv.com/rosemary-and-thyme/show/.../summary.html
https://www.tv.com/rosemary-and-thyme/show/21424/summary.html