Plants are pretty straight-forward organisms. They need sun to grow in, water to drink, oxygen to breathe and enough nutrients to help ‘em eat. But what happens when you’re doing all of these things and your plant still isn’t growing? The chances are, you probably need to do a soil test to find out. It might sound serious, but it’s not all that involved. Here’s what you need to do and know if you think it might be time for a soil test.