Ran upon this on the Splenda site:


SPLENDAŽ Granulated Sweetener is heat stable and can be used as a
sweetener in canning and in making jams and jellies. However, SPLENDAŽ
Granulated Sweetener Products do not provide the preserving properties
of sugar, so proper canning techniques are essential to avoid spoilage
and to achieve successful results. Once opened, these homemade goodies
must be stored in the refrigerator and used within one month, to
minimize any spoilage from natural airborne bacteria

Next fruit crop we get I will try some jelly or jam with Splenda and see
how it works.