re. the article, backfilling the holes with compost rather than a coarse grained medium appears to make more sense.
Have been periodically waging war on comfrey in our vegetable garden for several years. Once it gained an unwanted foothold it has proven formidable.
Have been periodically waging war on comfrey in our vegetable garden for several years. Once it gained an unwanted foothold it has proven formidable.