In some cities, as many as one in four office spaces are vacant. Some start-ups are giving them a second life – as indoor farms growing crops as varied as kale, cucumber and herbs.

As one of the easiest vegetables to grow, learning how to grow kale is a great choice for beginner gardeners, especially if you're pondering how to start your own small vegetable garden.

kale) and fruit that can grow in a short four-month growing season. I've had a countertop indoor growing system for years, but never had the space to grow vegetables indoors. After five weeks of ...

Microgreens are tiny, immature versions of selected edible vegetables, herbs and other plants harvested anywhere from 7 to 21 ...

Lettuce can be grown year-round and is quick to harvest. You can pick leaves as needed. Loose-leaf varieties like "Lollo ...

Some start-ups are giving them a second life – as indoor farms growing crops as varied as kale, cucumber and herbs. Since its 1967 construction, Canada's "Calgary Tower", a 190m (623ft ...