Orange

See: Citrus spp. Order

A level in the taxonomic hierarchy. An order is a group of closely related families. Organ

Any significant, macroscopic component of an organism. Organelles

The internal, microscopic organs of a single cell. Organic chemicals

Originally, chemical substances that had been produced by living organisms were called 'organic' chemicals, as opposed to the 'inorganic' chemicals such as rocks and water, which had not been produced by living organisms. Nowadays, the term 'organic chemical' refers to any carbon-based compound, including the synthetic organic chemicals. The original meaning is retained in terms such as organic and inorganic fertilisers, farming, etc.

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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