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Use a brick to weigh down the leaves, which will compact the process. Add water ter at roughly one part comfrey to 20 parts water, but you don’t n’t need to be completely exact. The e more water you add, d, the more diluted uted you’ll make the e concoction. If thehe end result, however, owever, is a dark black ack liquid, you’ll need ed to dilute it to a light ht tea colour, so it isn’t n’t too abrasive on the e plants. Do add a lid on top – mainly because cause the brew will ill smell rotten after er a while! Add more ore leaves as and when hen to perfect your potent tent mix.