Raspberries grow around a central nub, or "torus," that stays on the plant when the berries are picked. Notice the hollow fruit.
- Raspberries grow around a central nub, or "torus," that stays on the plant when the berries are picked. Notice the hollow fruit.
- Black raspberries are hollow when picked, just like their red siblings.
- Golden raspberries are also hollow when picked.
- Blackberries look like raspberries, but are not ripe when they're red.
- Blackberries do not have the same hollow center as raspberries when picked. Instead, they are solid fruit.
- Mulberries grow on thorn-free trees, and may be ripe when red. They are also much longer than blackberries. Photo by Martin Labar, http://www.flickr.com/photos/martinlabar/
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