How can I improve the potassium levels in my garden soil for optimal plant growth?

To improve potassium levels in your garden soil for optimal plant growth, you can add potassium-rich fertilizers such as potassium sulfate or potassium chloride. You can also use organic materials like compost or manure, which naturally contain potassium. Testing your soil regularly and adjusting the potassium levels accordingly will help ensure your plants have the nutrients they need to thrive.