Turnip and carrot greens growing in water. They took off after I put water from my dehumidifier in the tray versus tap water. I’m sure rain water would be even better. This is about 3 days of growth. I think you can regrow the greens several times. These you’re basically regrowing for greens. There are recipes out there for vegetable greens.
About day 2 of regrowing my lettuce. It was the butter lettuce that comes with the roots.
My cabbage is starting to grow leaves again. The cabbage just had the cut end. I started it in water and then put it in a small planter that was empty because a plant died. I think any of these could be grown in water.
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Yes my late mother use to do this. when she pealed veg. She use to re plant them mainly carrots. .
Potatoes she use to cut up making sure there was a eye on the middle. Then do g a trench , put the pototo cuttings in then cover over. She could do the same with sprouts. How she managed to do it don't know but she always got a crop...