Here's a BBC article especially relevant for gardeners. Why? Because there are so many tiny tasks and because the tendency (at least mine) is to avoid the places that aren't doing so well, the plants that aren't thriving, and even the easy things that aren't panic-worthy at the moment.
Here's a good piece of advice from the article, though the whole thing is worth reading:
"So, how do we motivate ourselves to tackle a task we’re dreading? Timothy Pychyl, a psychology professor at Carleton University in Ottawa and author of Solving the Procrastination Puzzle, says motivation often follows action. So, if you just do something right away, without first stopping to think about why you don’t want to do it, you may be better off in the long run.
“Next time you feel that your whole body is screaming, ‘I don’t want to, I don’t feel like it’, ask yourself: what’s the next action I need to take on this little task if I was going to do it,” he explains. “What happens then is that you’re moving your attention off your emotions and on to your action.” "
Why we procrastinate on the tiniest of tasks - BBC Worklife