The West Sussex-based bedding grower sold a pink geranium in a pink pot to raise money for the charity, selling at 14 garden centres including sister company Newbridge Nurseries.
It donated money for each of the 3,250 plants that were produced by the nursery.
Titmuss said 2013 had been a "fairly good" year after a "concerning" early season. "From the end of April it has been reasonable," he added. "I don't think that you'll get a better run of a season than this year. It's been consistent all the way through and has rolled on into late June."
Next year, Barnsfold Nurseries plans to slightly increase its production of baskets and containers.
Titmuss said: "Value-added is more important than anything else at moment. The biggest growth area is finished containers, then baskets. Pack bedding is plateauing off a little bit."