It's easy to see where the confusion comes from. Both are members of the vast cabbage family and both are rounded veggies that grow beneath the earth. Yet, turnips are smaller than rutabagas and require much less time to mature. In fact, we start planting turnips in the cold frame a month or two before the last frost (late March through April) and they're ready in just 6 to 8 weeks. Rutabagas, on the other hand, take months to mature and the roots are often stored for winter meals. I rarely offer precious garden space to rutabagas - a long season crop that is cheap and widely available.
Turnips also have delicious edible foliage. When my hubby first tried them raw and straight from the garden, he declared them 'better than arugula' - high praise, indeed! Great for salads or for cooked greens.
These photos are some of my beloved Hakurei turnips that mature in just 38 days! The pure white roots are smooth, crisp and quite sweet. We start pulling them when they're an inch across (picking every 2nd one to thin the remainder) and the rest are pulled when needed until they're 2 inches across.
In my seed obsession this year, I've ordered about a half dozen new types of turnips to try.. not sure where they'll go, but they're easy to intercrop with other slower-growing brassicas like broccoli or cabbage. Plus, they're so quick growing, we can succession plant them from late winter to late summer..
Happy Gardening!