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"The best and most amazing thing about lettuce, besides eating it, is that if the stump is intact it will regenerate and regrow new shoots for a second harvest. All I did was put each stump in a half inch of water, check the level daily, and wait for tender new growth."
Re-grow Romaine Lettuce Hearts - just cut, place in water, and watch them grow back in days...
17 Apart: Growing Celery Indoors: Never Buy Celery Again How to grow celery from the base of celery you bought. Cut off the base, put in a bowl of water, change water daily for a week. Transfer to a pot, placing the old celery beneath the soil with just the new leaves above. Keep in a sunny spot (indoors or out) and harvest leaves and stalks as they grow.
Food-That-Magically-Regrows-Itself. Did not work for celery for me. Looked like it would but then it just shot up the middle. Most of the others work or should work though