‘Overnighting’ water in a wide-mouthed container does get rid of chlorine, and your sensitive plants will thank you for it ‘Overnighting’ water in a wide-mouthed container does get rid of chlorine, and your sensitive plants will thank you for it The problem Rainwater is the gold standard for houseplants, but not everyone has a garden, a water butt, or the inclination to collect it. For those relying on tap water, the question is how to make it as plant-friendly as possible. Chlorine is added to