Dan,

I'd definitely do a pH test on your rainwater when you can, just to be sure. Unless you live near a really industrialized area you're rainwater probably isn't going to be too acidic, but it's still good to know for future reference. Also, if you're using rainwater exclusively you need to add a product like Calmag Plus to supplement the calcium and magnesium that's generally provided through most tap water, but not rainwater. In more cases than not tap water is perfectly fine to use, but again you'll want to know the pH of it as well.

Take care. :jointsmile:
Mr. Clandestine Reviewed by Mr. Clandestine on . HELP - Plant dying dis-coloured leaves I started growing my 3rd plant about a month or 2 ago in my conservatory, which get lots of light as it is south facing. Recently I went away for 5 days and decided to cover the soil with stones( stop soil drying up) and give it a good water with some miracle grow plant food, so it would not get thirsty. When I returned my plant went from a lovely healthy looking green plant to a sorry state for a plant, the lower leaves had fallen off and were brown and yellow as in the picture, i have Rating: 5