Leaves and stems of russian comfrey are extremely rich in NPK (nitrogen, phosphorus, potassium). In addition to these three major nutrients required by plants during their development, it contains allantoin, vitamin B 12 and natural hormones that promote their flowering and fruiting.
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Bocking 14 cuttings from our cultures are not likely to invade your garden as this variety is sterile.
Plant them quickly and you'll get some beautiful comfrey plants to use as manure, compost activator or just to mulch your garden.