Greg Recommends Viridi

Price : Free
Website : STEAM

So here's an unusual game. Viridi is a plant simulator where you can arrange, water, and admire a virtual pot of plants. You start out by picking a 'starter' pot which comes with a handful of seedlings and a snail who slowly cruises along the side of your pot. You water your plants when they are thirsty and zooming up close to any one of them allows you to sing to your plants which may or may not make them grow faster and bigger. The game is real time so you can check in once every few days (you get a time-lapse viewing from since you last logged in) to pluck weeds and water thirsty plants. Once a week you can collect a free seedling to plant or save at your leisure. You can also buy virtual seedlings via micro-transactions.

It's a surprisingly calming and beautiful little game with gentle music that you can check in on every once and a while to keep your plants happy and healthy and maybe linger a bit for stress relief. It may not be for everyone but it is free and as far as plant simulators go, it's a quality product.