Many of the crops in Harvest Moon: Sunshine Islands are the same as those found in the rest of Harvest Moon series.There are starter crops like turnips and corn. As well as the crops you have to unlock such as pineapple. Additionally, there are wheat crops such as rice and buckwheat.
A reasonably new thing is that crop growth now depends on a point weather system. This is the same weather system seen in the previous DS game Harvest Moon: Island of Happiness where sun and water plays a more important role in crop results.