The answer to 'why is my hedge drainage problems' is that poor drainage around your hedge can be caused by a few common issues, such as soil compaction, clogged drains, or inadequate slope. Symptoms may include waterlogged soil, stunted plant growth, and disease or pests. To solve the problem, you'll need to address the underlying cause.
Start by checking the soil around the hedge. If it's dense and compacted, aerate it using a garden fork or aerator tool to improve water infiltration. You may also need to add organic matter like compost to improve drainage. If there are drainage pipes or channels, make sure they're clear of debris. Ensure the area has a slight slope to allow water to flow away from the hedge.