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I always put crushed wellI always put crushed well washed eggshells and coffee grounds as I plant my roses. Every time they have bloomed huge the first year. Grandmother taught me that trick I know the coffee is for nitrogen but does anyone have a clue what the eggshells contribute?

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?