HAVE you ever noticed how plants appear greener and brighter after a good rainstorm? It’s not just because the dust and dirt is washed off. Rainwater is a clear, salt-free source of water that contains many beneficial ingredients for plants. Rain can contain sulphur, potash, several other minerals, and even micro-organisms. All of these provide a boost to plant growth. During summer thundershowers, there can even be an added bonus when lightening converts atmospheric nitrogen into a nitrogen solution for plants to absorb and use.