When people ask me for a garden that looks after itself, what they usually mean is a manageable one, and the difference matters to me. A garden that asks nothing of you tends to end up as plastic grass and a barbecue once a year, and that is not what I design. A manageable garden is designed around the time you actually have: plants chosen for your soil and conditions, ground cover that leaves weeds nowhere to start, surfaces that do not need constant attention, and borders sized to the hours you want to spend on them. I design manageable gardens across Yorkshire, on soils from Vale of York clay to Harrogate gritstone to Wetherby magnesian limestone.
Most gardens that feel like hard work were never designed to be otherwise. They were planted with beautiful things that suit a different climate, or a different soil, or a person with considerably more time. They grew, and became unmanageable, and the gap between the garden as imagined and the garden as experienced widened every season.
This is almost always fixable, but it has to be addressed at the design stage, not the afterthought stage.
If you are not sure whether your garden has tipped over into hard work, Is your garden a burden? has a simple way to find out. And if you need colour in a hurry while you decide, annual seed mixes will fill a gap for a season with very little effort from you.