No room for a garden outdoors? Learn how to make your own closed-lid terrarium with step-by-step instructions.

Instead of growing in soil, they cling to trees, rocks and even buildings. And they do it without parasitizing or harming their hosts.

But if commuters do have a moment to pause, they’ll find an excuse to stop and, quite literally, smell the roses. Dotted around several underground stations, passengers can find ‘tiny parks’ – ...