How long will a plant grow in water?
Spent some time with a local GW friend today, and we had an interesting discussion about her rooting vase.
Is there a limit to how long a plant will grow in water? Not hydroponics or anything - just sitting the plant in a jar, and freshening the water so it doesn't get stagnant. I know it depends on the plant to some extent - I think philodendrons and sweet potatoes will grow quite a while - but don't they all eventually have to go into soil? Does it help to add fertilizer to the water? Has anybody tested to see how long they can go before they need soil?
Is algae inevitable, and does it harm the plant if it's in the water or on the roots? Is there any way to get rid of it that won't harm the original plant?