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Message: [QUOTE="oneeye, post: 280713, member: 8968"] I use rainwater for all my container plants most especially seed germination and seedlings. The best pH for small plants is 6.5 to 7. pH for the best nutrient absorption. Since rainwater absorbs carbonic acid from carbon dioxide the pH is perfect. Tap water is treated with chemicals, and the pH is altered to keep heavy metals from leaching into the drinking water. Some of the chemicals can harm tiny plant roots. The other option is to use filtered reverse osmosis water fortified with Cal Mag supplement. Good luck and keep us posted. [/QUOTE]