Help us reproduce the exact problem.
If a calculator, planner or garden workflow is behaving unexpectedly, include the page or tool name, the inputs you used, what you expected to happen and what happened instead. For location-aware features, a town or postcode is normally enough; do not send a precise home address when it is not necessary.
For a correction to plant data, methodology or explanatory text, identify the exact statement and explain what you believe should change. If you have a reliable public source that supports the correction, include its name or link. Specific reports are much easier to verify than a general message saying that a page is wrong.