Yes, it works fine. Just don't make the rows wider than you can reach to the middle. Four feet is about the max, three feet may be easier. But there's no law that says they can't be two or even one foot wide, either. Customize them to suit yourself and your garden area!

Single row planting is more for plants that need more extensive root space and/or sun (like corn), or surface space (like squash and melons), or to allow walking space for repeated picking (like pole-type peas and beans).

For things like carrots, parsnips, bush beans and bush peas, practically all the salad crops, etc., wide rows are a good way to get quite a lot of crop into a smaller area.

Just remember that with all the additional plants, you'll need good, nutritious soil to feed them all.

Sue

p.s.

Just don't place your taller plants in the rows where they will shade the shorter plants, unless that is your intention.

Generally speaking, you would put your taller plants on the north side if you're north of the equator, and on the south side if you're south of the equator.

Sue

I've been using wide row planting or block planting forever. I had my own version of Square Foot Gardening back in the mid-70s.

To belgianpup's advice, I'll just add that if the plants are too crowded, maintenance is more difficult, pests have more places to hide, and fungal diseases are more likely.

Yep; our garden this year is all in four foot wide rows for everything from radishes to corn.