Harvestable Plants not producing

@Pixieydust, do you have Seasons and is it late Fall or Winter? If so, then harvestable plants will go dormant and not be harvestable. Trees seem to work OK and will lose their leaves so you can see they are dormant (it will also say so in the pop-up that comes up when you hover you mouse over them.
Other plants though seem to bug out at this time of year and appear to be harvestable, even say ready to harvest, but they do not show any fruit and the Harvest interaction will not appear.