Invasive roots in veg patch
Last autumn I dug a load of well rotted garden compost into my veg patch and then covered it with strawed horse manure and covered the lot with polythene over the winter. I recently removed the polythene and dug in the decomposing manure only to find an invasive root system spreading across the patch. The roots are dark red and vary in thickness up to 4mm. Does anyone have any idea what this is?