Sometimes tap (faucet;-) or borehole water can be a problem and using rainwater can make a big difference to germination and later growth. Having the pH of your water tested is a good idea. Also test for chlorine and other chemicals. Usually your local Department of Agriculture is a good place to go.
The Proteaceae are adversely affected by brackish or alkaline water and water with a high salt content. Some dam or lake water may also contain spores of the cinnamon fungus (Phytophthora cinnamomi), which is deadly to proteas. This is usually the case if it drains from an area that naturally carries this soil-borne fungus.
