As I recall, grapes has to at least be part of the combination for it to count. The challenge in question is called "The Vizard of Vine" and the benefits of completing it only affect the harvest of grapes.
Which makes this one an excellent combination with a gardener sim.
@Alexandria_: Now you're busy with nectar making, why not maxing your sim also in
gardening so the fruits are even tastier, in
fishing so he can catch the best fertilizer, in
inventing so he can make a masterfull collection sucker (forget the name) to do some easy fruitsucking, which is way faster than harvesting and in
handiness so he can upgrade the sprinklers and the nectar machine?
Nectar making is my all time favorite skill in The Sims 3 and it actually made me drink wine in real life. I've made a farm in The Sims 3 just for making nectar with all it's benefits. I will upload it to the Swap Shop once my computer is connected again.