I have a small veg patch (48 sq ft) that is "tired" through, I believe, not
enough variety of crop, plus failure to rotate crops sufficiently.

Someone has suggested a year under a green fertilizer and has suggested
comfrey. I know nothing about this and would welcome some advice (ie can
comfrey be used for this? If not, what alternatives would you suggest?)

If this is a workable solution, can I rotovate comfrey into the soil at the
end of the season so that the garden is ready for veg next spring?

TIA.

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CM