Ward had a long and successful career in the industry selling sundries to garden centres.
Known to colleagues as Terry Lockyer (her maiden name), she was one of the first women to work as a sales representative in horticulture - working for many of the major wholesalers.
In the early 1970s she founded Mill Horticultural - which supplied sundries to garden centres in the South West.
She leaves behind husband Tony Ward, whom she met 25 years ago at a Hillier Christmas dance.
Tony Ward, who is sales director of vegetable and flower seed supplier Kings Seeds, based in Colchester, Essex, said: "Teresa liked the niceness of the people in this industry. Most manufacturers of sundries know her."
The funeral was held earlier this week in Chelmsford.