Seeing a full room of punters queuing for my show is always heartening.

Fertilizers are chemicals added to plants to help them grow. Important elements in fertilizers include nitrogen, phosphorus and potassium. Manure (animal waste) is also used as a fertilizer.

There are over 200,000 identified plant species and the list is growing all the time.

In the agricultural industry, to ensure crops of food grow well water is often added to soil in the form of irrigation.

A new broom sweeps clean.